Resumen Los cementos bioactivos a base de silicato tricálcico se introdujeron en el mercado para uso en odontología, con una variedad de aplicaciones clínicas. Estos cementos pueden estar en contacto con tejidos como la pulpa dental o el periodonto, en caso de extrusión no intencionada. Por lo tanto, es importante conocer la genotoxicidad y la citoxicidad de estos materiales. El objetivo de este estudio fue evaluar la citotoxicidad y genotoxicidad de los selladores bioactivos Bio-C® Sealer y MTA Repair HP® en fibroblastos humanos. Se prepararon discos de selladores bioactivos Bio-C® Sealer y MTA Repair HP® y se colocaron durante 24h en condiciones de esterilidad. Los discos se colocaron en medio de cultivo a 2,5mg/mL dentro de un mezclador de rodillos SRT6D (Stuart, Reino Unido) a 60rpm durante 24h. Los eluidos obtenidos se incubaron durante 24h con fibroblastos de la línea celular ATCC previamente activados y cultivados al 80% de confluencia. La citotoxicidad se evaluó mediante ensayos Alamar Blue® y LIVE/DEAD; así como el análisis de los ensayos Tunnel y Mitotracker para evaluar la genotoxicidad, utilizando el microscopio confocal láser de barrido. En el ensayo Alamar Blue®, el Sellador Bio-C® presentó una proliferación celular del 87%, mientras que el sellador MTA Repair HP® fue del 72%. Se encontró una diferencia estadísticamente significativa entre el sellador MTA Repair HP® con respecto al control negativo (p=<0.001). En cuanto a las pruebas de genotoxicidad, en el ensayo Tunel, ambos materiales tiñen el núcleo de las células fibroblásticas expuestas a los eluidos, mientras que el ensayo Mitotracker, el sellador MTA Repair HP®, mostró una mayor función mitocondrial que el Bio-C® Sealer. Los selladores a base de silicato de calcio, Bio-C® Sealer y MTA Repair HP® no son citotóxicos y tienen una baja genotoxicidad.

Abstract Bioactive cements based on tricalcium silicate have been introducedto the market for use in dentistry, with a variety of clinical applications. These cements are in contact with vital tissues such as dental pulp or periodontium in cases of unintentional extrusion; thus, it is important to know the genotoxicity and cytoxicity of these materials. The objective of this study was to evaluate the cytotoxicity and genotoxicity of bioactive sealers, Bio-C® Sealer and MTA Repair HP®, in human fibroblasts. Discs of bioactive sealers Bio-C® Sealer, and MTA Repair HP®, were prepared and set for 24h under sterile conditions. The discs were placed in culture medium at 2.5mg/mL inside a SRT6D roller mixer (Stuart, UK) at 60rpm for 24h. The eluates obtained were incubated for 24h with previously activated and cultured ATCC cell line fibroblasts at 80% confluence. The cytotoxicity was evaluated by Alamar Blue® and LIVE/ DEAD assays, as well as the analysis of the Tunel and Mitotracker assays to evaluate genotoxicity using the confocal laser-scanning microscope. In the Alamar Blue® assay, the Bio-C® Sealer presented a cell proliferation of 87%, while the MTA Repair HP® Sealer was 72%. A statistically significant difference was found between the MTA Repair HP® Sealant and the negative control (p=<0.001). Regarding the genotoxicity tests, in the Tunel assay, both materials stain the nucleus of the fibroblast cells exposed to the eluates, while in the Mitotracker assay, the MTA Repair HP® Sealer showed greater mitochondrial function than the Bio-C® Sealer. Calcium silicate-based sealers, Bio-C® Sealer and MTA Repair HP®, are not cytotoxic and have low genotoxicity.

ABSTRACT: Anchoring is the process that allows new information to be inserted into the framework of pre-existing schemes. Allows to instrumentalize the content in communication. In During the training of specialists, we anchor contents with a situational diagnosis. The purpose of this essay was to anchor contents of mastication and mandibular dynamics in professionals, students in the specialization program in Periodontics, of the Faculty of Dentistry, Universidad de Chile. The program has a rehabilitation unit in reduced periodontium (one credit, 5 sessions). This is taught with situational diagnosis and active methodologies: Reverse classroom and small group discussion. The chewing and mandibular dynamics contents were anchored through these methodologies with videos, to stimulate the identification of patterns; pinned content is identified. Individual and collective reflection was encouraged and students from the 2020 (telematic) and 2022 (in-person) classes were compared. Students were coded from 1 to 14. Characterization of the 2020 cohort: 4 men, 4 women; 5.75 years of average graduation, 2 from U. del Desarrollo, 1 U. de Concepción, 2 U. de Talca, 2 U. de Chile and 1 U. de Los Andes. Cohort characterization 2022: 3 women, 3 men; 6 years of average graduation, 5 U. de Chile and 1 U. de La Frontera. The 2020 cohort identified patterns in the second session, except for students 5 and 7 who did so in the fifth session. During the collective reflection, transformational leadership predominated. Of the 2022 cohort, only student 14, was able to identify patterns in the second session, while all of her classmates did so in the fifth session. During the collective reflection, transactional leadership predominated. In teaching professionals, the same methodologies, applied telematically or in person to anchor new content, were influenced by the leadership styles of the students, which favored or delayed the identification of the patterns.

RESUMEN: El anclaje es el proceso que permite insertar lo nuevo en el entramado de esquemas preexistentes. Posibilita instrumentalizar el contenido en la comunicación. En formación de especialistas, anclamos contenidos con un diagnóstico situacional. El propósito de este ensayo fue, anclar contenidos de masticación y dinámica mandibular en profesionales, estudiantes del programa de especialización en Periodoncia, Facultad de Odontología, Universidad de Chile. El programa posee la unidad de rehabilitación en periodonto reducido (un crédito, 5 sesiones). Esta se imparte con diagnóstico situacional y metodologías activas: aula reversa y discusión de grupo pequeño. Los contenidos masticación y dinámicamandibular se anclaron mediante estas metodologías con videos, para estimular la identificación de patrones; contenido anclado es identificado. Se incentivó la reflexión individual y colectiva y se compararon los estudiantes de las promociones 2020 (telemática) y 2022 (presencial). Los estudiantes fueron codificados del 1 al 14. Caracterización de la cohorte 2020: 4 hombres, 4 mujeres; 5.75 años de egreso promedio, 2 U. Desarrollo, 1 U. de Concepción, 2 U. de Talca, 2 U. de Chile y 1 U de los Andes. Caracterización cohorte 2022: 3 mujeres, 3 hombres; 6 años de egreso promedio, 5 U. de Chile y 1 U. de La Frontera. La cohorte 2020 identificó patrones en la segunda sesión, a excepción de los estudiantes 5 y 7 que lo hicieron en la quinta sesión. Durante la reflexión colectiva, predominaron liderazgos transformacionales. De la cohorte 2022, solo el estudiante 14 identificó patrones en la segunda sesión y todos sus compañeros lo hicieron en la quinta sesión. Durante la reflexión colectiva, predominaron liderazgos transaccionales. En educación de profesionales, iguales metodologías, aplicadas telemáticamente o de manera presencial para anclar nuevos contenidos, se vieron influenciadas por los estilos de liderazgos de los estudiantes, que favorecieron o retardaron la identificación de patrones.

ABSTRACT Orthodontic tooth movement is a mechanically induced bone remodeling process aimed at aligning malpositioned teeth. Periodontitis is a polymicrobial infection of the supporting tissues of the teeth that results in the destruction of the periodontium. Diabetes Mellitus is a metabolic disorder that contributes to several types of comorbidities and even premature death of an individual. Due to the high demand of diabetic patients with periodontitis and the need for orthodontic therapy to achieve better periodontal health, we aimed to carry out a bibliographic review on orthodontic tooth movement in patients with periodontitis and diabetes mellitus. The search for articles in this literature review took place between February 2022 and March 2023. The articles were researched, selected and extracted through the database: PUBMED, LILACS and GOOGLE SCHOLAR available online, in the range of years between 1990 and 2022. Diabetes and periodontitis may adversely affect bone remodeling in orthodontic tooth movement. However, despite the need for further long-term studies to elucidate the mechanism of orthodontic tooth movement in diabetic patients with a history of periodontitis, the literature suggests that if there is a well-established periodontal-orthodontic therapy associated with the patient’s glycemic control, the treatment will be successful. periodontium individual health mellitus 202 2023 researched database PUBMED online 199 However longterm long term wellestablished well established periodontalorthodontic patient s control successful 20 19 2 1

RESUMO A movimentação dentária ortodôntica é um processo de remodelação óssea induzida mecanicamente com o objetivo de alinhar dentes mal posicionados. A periodontite é uma infecção polimicrobiana dos tecidos de suporte dos dentes que resulta na destruição do periodonto. O Diabetes Mellitus é um distúrbio metabólico que contribui para vários tipos de comorbidades e até mesmo a morte prematura de um indivíduo. Devido a grande demanda de pacientes diabéticos com periodontite e apresentando a necessidade da terapia ortodôntica para atingir melhor saúde periodontal, tivemos como objetivo realizar uma revisão bibliográfica sobre a movimentação dentária ortodôntica em pacientes com periodontite e diabetes mellitus. A busca pelos artigos desta revisão de literatura ocorreu entre fevereiro de 2022 e março de 2023. Os artigos foram pesquisados, selecionados e extraídos por meio das bases de dados: PUBMED, LILACS e GOOGLE SCHOLAR disponíveis online, no intervalo entre 1990 até 2022. Diabetes e periodontite podem afetar adversamente a remodelação óssea na movimentação dentária ortodôntica. No entanto, apesar da necessidade de mais estudos a longo prazo para elucidar o mecanismo da movimentação dentária ortodôntica em pacientes diabéticos com histórico de periodontite, a literatura nos sugere que se houver uma terapia periodontal-ortodôntica bem estabelecida associada ao controle glicêmico do paciente, o tratamento será bem-sucedido. posicionados periodonto indivíduo periodontal mellitus 202 2023 pesquisados dados PUBMED online 199 entanto periodontalortodôntica paciente bemsucedido. bemsucedido sucedido. sucedido bem-sucedido 20 19 2 1

SUMMARY: The dentogingival junction (DGJ) is an adaptation of the oral mucosa composed of epithelial and connective tissues intimately related with the mineralised tissues of the tooth. The histological evidence available is mainly based on studies in animals, separate evaluations of hard and soft tissues, and studies using conventional histological techniques that eliminate the enamel from preparations. The aim of this study was to carry out a review of the existing evidence on histological techniques available for study of the tooth and periodontium in conjunction in humans. A scoping review was carried out of the available literature referring to study of the tooth and the periodontium in conjunction in humans, in the Web of Science (WoS), EMBASE, Scopus and SciELO databases, using the terms "Histological Techniques"[Mesh]) and "Epithelial Attachment"[Mesh]. One hundred and fifty-nine articles were found, of which 54 were selected for full- text reading. Ten were finally included in the qualitative synthesis, and we applied the Anatomical Quality Assurance (AQUA) checklist for analysis the methodological quality of the selected articles. The results showed that the only articles with a low risk of bias in all five domains according to the AQUA criteria corresponded to Silva et al. (2011) and Agustín-Panadero et al. (2020). Finally, we conclude that the quality of the histological sections to observe tissues that simultaneously contain the tooth and the periodontium, is conditioned by the selected technique and by the care required in certain specific tasks during the histological processing of the samples.

RESUMEN: La unión dentogingival (DGJ) es una adaptación de la mucosa oral compuesta por tejidos epitelial y conectivo íntimamente relacionados con los tejidos mineralizados del diente. La evidencia histológica disponible se basa principalmente en estudios en animales, evaluaciones separadas de tejidos duros y blandos y estudios utilizando técnicas histológicas convencionales que eliminan el esmalte de las preparaciones. El objetivo de este estudio fue realizar una revisión de la evidencia existente sobre las técnicas histológicas disponibles para el estudio del diente y el periodonto en conjunto en humanos. Se realizó un scoping review de la literatura disponible referente al estudio del diente y el periodonto en conjunto en humanos, en las bases de datos Web of Science (WoS), EMBASE, Scopus y SciELO, utilizando los términos “Histological Techniques”[Mesh]) y "Epithelial Attachment"[Mesh]. Se encontraron 159 artículos, de los cuales 54 fueron seleccionados para lectura de texto completo. Diez fueron finalmente incluidos en la síntesis cualitativa, y se aplicó la lista de verificación Anatómica Quality Assurance (AQUA) para el análisis de la calidad metodológica de los artículos seleccionados. Los resultados mostraron que los únicos artículos con bajo riesgo de sesgo en los cinco dominios según los criterios AQUA correspondían a Silva et al. (2011) y Agustín-Panadero et al. (2020). Finalmente, concluimos que la calidad de los cortes histológicos para observar los tejidos que contienen simultáneamente el diente y el periodonto, está condicionada por la técnica seleccionada y por el cuidado requerido en ciertas tareas específicas durante el procesamiento histológico de las muestras.

RESUMEN La pulpa dental y el periodonto presentan diferentes vías de comunicación. El foramen apical, los conductos accesorios y los túbulos dentinarios son ejemplos de ellos. Durante los procedimientos peri-odontales regenerativos se realiza el raspaje, alisado y tratamiento de la superficie radicular con un acondicionador a base de ácido etilendiaminotetraacético (EDTA). Este tratamiento podría generar una comunicación patológica entre ambas estructuras debido a la interrupción del pedículo vascular o a la migración de bacterias y/o subproductos inflamatorios provenientes de bolsas periodontales profundas que generen patología pulpar. Objetivo: El objetivo del presente estudio fue evaluar la influencia de la cirugía periodontal regenerativa mínimamente invasiva sobre el estado de vitalidad pulpar de piezas dentarias unirradiculares y multirradiculares con defectos infraóseos que se extendían hasta el tercio medio y apical. Materiales y Método: Se analizaron de forma retrospectiva 30 piezas dentarias de 14 pacientes atendidos entre el mes de agosto 2018 y agosto 2019 en el posgrado de la Especial-ización en Periodoncia de la Facultad de Odontología de la Universidad de Buenos Aires (FOUBA). Se realizó el diagnóstico endodóntico de forma clínica y radiográfica a los 6 meses post-tratamiento periodontal regenerativo mínimamente invasivo. Resultados: De las 30 piezas solo 2 presentaron cambios en el estado pulpar luego del procedimiento periodontal regenerativo, pulpitis irreversibles a los 30 días y necrosis pulpar a los 180 días post-tratamiento. La tasa de riesgo de cambios en el estado de vitalidad pulpar fue del 6,7%. En relación a las piezas dentarias que presentaban lesiones de furcación grado I y II (n=9) ninguna presentó cambios en su estado pulpar. Conclusiones: La cirugía periodontal regenerativa no tuvo influencia significativa en el estado pulpar de piezas unirradiculares y multirra-diculares con defectos infraóseos que se extendían a nivel del tercio medio y apical.

ABSTRACT Dental pulp and periodontium have different communication routes including, e.g., apical foramen, accessory canals and dentin tubules. Scaling, planing and root surface treatment with ethylenediaminetetraacetic acid (EDTA)-based conditioner are used in regenerative periodontal procedures. Such treatment may generate pathological communication between the two structures due to interruption of the vascular pedicle or migration of bacteria and/or inflammatory byproducts from deep periodontal pockets, which may generate pulp pathology. Aim: The aim of this study was to evaluate the influence of minimally invasive periodontal regenerative surgery on pulp vitality status in single-rooted and multi-rooted teeth associated to infraosseous defects extending to the middle and apical thirds. Materials and Method: This was a retrospective study on 30 teeth from 14 patients who received care between August 2018 and August 2019 at the postgraduate Department of Specialization in Periodontics of the Buenos Aires University School ofDentistry (FOUBA). Clinical and radiographic endodontic diagnosis was performed 6 months after the minimally invasive regenerative periodontal treatment. Results: Only two out of the 30 teeth presented changes in pulp status following regenerative periodontal procedure: irreversible pulpitis at 30 days and pulp necrosis at 180 days post-treatment. The rate for risk of change in pulp vitality status was 6.7%. Teeth with grade I and II furcation lesions (n=9) presented no change in pulp status. Conclusions: Regenerative periodontal surgery had no significant influence on pulp status in single-rooted and multi-rooted teeth with infraosseous defects extending to the level of the middle and apical third

Resumen Introducción: La prevalencia de periodontitis apical en dientes con tratamiento endodóntico oscila entre el 35 y el 60%, se ha encontrado una fuerte asociación con respecto al grado de inflamación sistémica generada por la periodontitis apical, como por ejemplo altos niveles de citoquinas proinflamatorias, proteína C reactiva e interleuquina 6; estudios refieren que un tratamiento endodóntico adecuado puede reducir los niveles de proteína C reactiva en individuos sanos y con periodontitis apical. Objetivo: Evaluar la frecuencia de periodontitis apical en una población adulta colombiana seleccionada y su correlación con la calidad del tratamiento endodóntico. Materiales y métodos: Estudio observacional analítico de corte transversal, se determinó la frecuencia de periodontitis apical en 318 CBCT (Tomografía Computarizada de Haz Cónico), de pacientes de una subpoblación de Bucaramanga y Medellín y evaluó la asociación de la calidad del tratamiento endodóntico con el estado periapical. Resultados: Sólo el 37,66% de los dientes evaluados fueron considerados sanos; el 44,81% se clasificaron como tratamiento endodóntico adecuado. La calidad del tratamiento endodóntico influyó significativamente en la condición del periodonto apical. Conclusiones: Los tratamientos evaluados presentaron alta frecuencia de periodontitis apical, la cual se asoció en buena parte a la alta frecuencia de tratamientos endodónticos inadecuados.

Abstract Introduction: The prevalence of apical periodontitis in teeth with endodontic treatment ranges between 35% and 60%, and a strong association has been found with respect to high levels of systemic inflammation markers (pro-inflammatory cytokines, protein C-reactive and interleukin 6) caused by apical periodontitis. Studies have shown that an adequate endodontic treatment can reduce C-reactive protein levels in healthy individuals and those with apical periodontitis. Objective: To evaluate the frequency of apical periodontitis in a selected Colombian adult population and its correlation with the quality of endodontic treatment. Materials and methods: Observational, analytical, cross-sectional study. The frequency of apical periodontitis was determined in 318 CBCTs of patients from Bucaramanga and Medellin, and the association between quality of endodontic treatment and periapical status was analyzed. Results: Only 37.66% of the observed teeth were considered healthy, whereas 44.81% were classified as teeth with appropriate endodontic treatment. Quality of endodontic treatment significantly affected the condition of the apical periodontium. Conclusions: The analyzed treatments had a high apical periodontitis frequency, which was associated with a high frequency of inadequate endodontic treatments.

Resumo Introdução: A prevalência de periodontite apical em dentes com tratamento endodôntico varia entre 35 e 60 %, uma forte associação foi encontrada com relação ao grau de inflamação sistêmica gerada pela periodontite apical, como altos níveis de citocinas pró-inflamatórias, proteína C reativa e interleucina 6; estudos relatam que o tratamento endodôntico adequado pode reduzir os níveis de proteína C-reativa em indivíduos saudáveis e naqueles com periodontite apical. Objetivo: Avaliar a frequência da periodontite apical em uma população adulta colombiana selecionada e sua correlação com a qualidade do tratamento endodôntico. Materiais e métodos: Estudo transversal analítico observacional; a frequência de periodontite apical foi determinada em 318 CBCT de pacientes de uma subpopulação de Bucaramanga e Medellín, foi avaliada a associação da qualidade do tratamento endodôntico com o estado periapical. Resultados: Apenas 37,66% dos dentes avaliados foram considerados saudáveis, 44,81% dos dentes foram classificados como tratamento endodôntico adequado. A qualidade do tratamento endodôntico influenciou significativamente a condição do periodonto apical. Conclusões: Os tratamentos avaliados apresentaram alta frequência de periodontite apical, que foi amplamente associada à alta frequência de tratamentos endodônticos inadequados.

Abstract In the case of endodontic infection, the presence of furcation canals can be at the origin of a periodontal lesion located in the furcation. The furcation being very close to the marginal periodontium, this type of lesion can be favorable to the genesis of an endo-periodontal lesion. These furcation canals are lateral canals located on the pulp chamber floor and constitute one of the many physiological communication pathways between endodontic and periodontal tissues. These canals are most often difficult to localize, shape, and to fill because of their small diameter and length. The disinfection of the pulp chamber floor with sodium hypochlorite solution may contribute to the disinfection of furcation canals when they are not identified, shaped, and/or filled. This case series illustrates the endodontic management of visible furcation canals associated with an endo-periodontal lesion. These furcation canals had a large diameter which allowed their identification during the endodontic treatment. infection periodontium endoperiodontal endo tissues localize shape length identified shaped andor or filled treatment

Resumo No caso de infecção endodôntica, a presença de canais cavo inter-radiculares pode estar na origem de uma lesão periodontal localizada na região de furca. Sendo a furca muito próxima do periodonto marginal, esse tipo de lesão pode ser favorável à fomação de uma lesão endo-periodontal. Esses canais estão localizados no assoalho da câmara pulpar e constituem uma das inúmeras vias de comunicação fisiológica entre os tecidos endodônticos e periodontais. Esses canais são na maioria das vezes difíceis de localizar, instrumentar e obturar por causa do diâmetro e comprimento reduzidos. A desinfecção do assoalho da câmara pulpar com solução de hipoclorito de sódio pode contribuir para a desinfecção dos canais cavo inter-radiculares quando eles não são localizados, instrumentamos e/ou obturados. Os casos clínicos descritos ilustram o manejo endodôntico de canais cavo inter-radiculares visíveis associados a uma lesão endo-periodontal. Esses canais cavo inter-radiculares tinham um grande diâmetro que permitiu sua localização durante o tratamento endodôntico. endodôntica interradiculares inter radiculares marginal endoperiodontal. endoperiodontal endo periodontal. endo-periodontal periodontais localizar reduzidos eou ou obturados

ABSTRACT Introduction: Fixed orthodontic retainers are very important for treatment stability; however, adverse effects on the health of periodontium can be caused as a result of deposition of plaque and calculus. Objectives: To compare and determine the effects of two mandibular fixed lingual retainers on the periodontal status, and to test the null hypothesis that there would be no significant difference on the periodontium health between the patients using fiber-reinforced composite (FRC) or multistranded wire (MSW) fixed retainers. Methods: A total of 60 subjects were recruited, out of which 6 were excluded and 2 dropped out during the study. Hence, 52 subjects with mean age of 21.5 ± 3.6 years were included in the study. The sample was composed by 8 males (15.4%) and 44 females (84.6%). The participants were randomly divided into two groups: Group 1 received fiber-reinforced composite retainer, while Group 2 received multistranded wire retainer. After insertion, plaque index, calculus index, gingival index and bleeding on probing were compared, after three months (T1), six months (T2), nine months (T3) and twelve months (T4), using Mann-Whitney test with p-value ≤ 0.05 as significant. Results: It could be seen that the health of periodontium deteriorated with the passage of time from T1 to T4 in both group of retainers. However, no statistically significant differences were found between the two groups (p> 0.05). Conclusion: The results of the study indicate that there was no significant difference on the health of periodontium between the patients with FRC and MSW fixed retainers, hence, the null hypothesis was accepted. Introduction stability however Objectives status fiberreinforced fiber reinforced (FRC (MSW Methods recruited Hence 5 215 21 21. 36 3 3. 15.4% 154 15 4 (15.4% 84.6%. 846 84.6% . 84 (84.6%) retainer insertion compared T1, T , (T1) T2, T2 (T2) T3 (T3 T4, (T4) MannWhitney Mann Whitney pvalue p value 005 0 05 0.0 Results However p> (p 0.05. 0.05) Conclusion hence accepted 15.4 (15.4 84.6 (84.6% (T1 (T2 (T (T4 00 0. 15. (15. 84. (84.6 (15 (84. (1 (84 ( (8

RESUMO Introdução: As contenções ortodônticas fixas são muito importantes para a estabilidade do tratamento; no entanto, elas podem causar efeitos adversos na saúde do periodonto, como resultado da deposição de placa e cálculo. Objetivos: Comparar e determinar os efeitos na saúde periodontal de duas contenções inferiores coladas por lingual, e testar a hipótese nula de que não haveria diferença significativa na saúde periodontal entre os pacientes usando contenções fixas de compósito reforçado com fibra (FRC) ou de fio multitrançado (MSW). Métodos: No total, 60 indivíduos foram recrutados, dos quais 6 foram excluídos e 2 desistiram durante o estudo. Assim, foram incluídos no estudo 52 indivíduos com média de idade de 21,5 ± 3,6 anos. A amostra foi composta por 8 homens (15,4%) e 44 mulheres (84,6%). Os participantes foram divididos aleatoriamente em dois grupos: O Grupo 1 recebeu contenção de compósito reforçado com fibra, enquanto o Grupo 2 recebeu contenção de fio multitrançado. Após três meses (T1), seis meses (T2), nove meses (T3) e doze meses (T4) da colagem, foram comparados os índices de placa e de cálculo, índice gengival e sangramento à sondagem, usando o teste de Mann-Whitney com p ≤ 0,05 como significativo. Resultados: Pôde-se observar que a saúde periodontal piorou com o passar do tempo, de T1 a T4, em ambos os grupos de contenções. No entanto, não foram encontradas diferenças estatisticamente significativas entre os dois grupos (p> 0,05). Conclusão: Os resultados do estudo indicam que não houve diferença significativa na saúde periodontal entre os pacientes com contenções fixas FRC e MSW; portanto, a hipótese nula foi aceita. Introdução tratamento entanto periodonto cálculo Objetivos lingual (FRC MSW. MSW . (MSW) Métodos total recrutados Assim 5 215 21 21, 36 3 3, anos 15,4% 154 15 4 (15,4% 84,6%. 846 84,6% 84 (84,6%) T1, T , (T1) T2, T2 (T2) T3 (T3 T4 (T4 colagem sondagem MannWhitney Mann Whitney 005 0 05 0,0 significativo Resultados Pôdese Pôde se tempo p> (p 0,05. 0,05) Conclusão portanto aceita (MSW 15,4 (15,4 84,6 (84,6% (T1 (T2 (T 00 0, 15, (15, 84, (84,6 (15 (84, (1 (84 ( (8

Abstract Introduction Periodontitis is an infectious-inflammatory disease resulting from microbial dysbiosis and host response that leads to the destruction of tooth support tissues, including periodontal collagen fibers, which may culminate in tooth loss. Objective To evaluate the behavior of periodontal collagen fibers during the progression of induced experimental periodontitis in rats. Material and method Twelve Wistar rats were distributed into groups: Control (C), 14-days Experimental Periodontitis (PE-14d), 21-days Experimental Periodontitis (PE-21d) and 42-days Experimental Periodontitis (PE-42d). At day 0, the animals of group C were euthanized. At the same day, the remaining animals were submitted to the installation of a cotton ligature around the lower left first molar for the induction of experimental periodontitis. The animals were euthanized at 14 (PE-14d), 21 (PE-21d) and 42 (PE-42d) days after the installation of ligature. Histological processing of the hemi-mandibles was performed and the sections underwent histochemical reaction using picro-sirius red. The descriptive qualitative analysis was performed under polarized light microscopy, in the dental furcation region, evidencing the fibers of the periodontal ligament. Result Group C exhibited thick and oriented bundles of mature collagen fibers, consistent with a normal appearance. The groups with experimental periodontitis exhibited severe tissue disruption, with immature and thinner collagen fibers, with such conditions being more exacerbated in the PE-14d and PE-21d groups. Conclusion The early stages of periodontitis present acute response, and therefore result in rapid destruction of periodontal support tissues and potentially impair fibrillogenesis and collagen restructuring in the periodontal ligament. infectiousinflammatory infectious inflammatory loss C, , (C) 14days PE14d, PE14d PEd PE 14d d (PE-14d) 21days PE21d 21d (PE-21d 42days PE42d. PE42d 42d . 0 1 2 4 (PE-42d hemimandibles hemi mandibles picrosirius picro sirius red microscopy region ligament appearance disruption (C (PE-14d

Resumo Introdução A periodontite é uma doença infecto-inflamatória, resultante da disbiose microbiana e da resposta do hospedeiro, que leva à destruição dos tecidos de suporte dentário, inclusive das fibras colágenas periodontais, podendo culminar na perda do elemento dental. Objetivo Avaliar o comportamento das fibras colágenas periodontais durante a progressão da periodontite experimental induzida em ratos. Material e método Doze ratos Wistar foram distribuídos nos grupos: Controle (C), Periodontite Experimental 14-dias (PE-14d), Periodontite Experimental 21-dias (PE-21d) e Periodontite Experimental 42-dias (PE-42d). No dia 0, os animais do grupo C foram eutanasiados. Neste mesmo dia, os animais remanescentes foram submetidos à instalação de uma ligadura de algodão ao redor do primeiro molar inferior esquerdo para indução da periodontite experimental. Tais animais foram eutanasiados aos 14 (PE-14d), 21 (PE-21d) e 42 (PE-42d) dias após a instalação da ligadura. Executou-se o processamento histológico das hemimandíbulas e as secções foram submetidas à reação histoquímica pelo vermelho picro-sirius. A análise qualitativa descritiva foi realizada sob microscopia de luz polarizada, na região de furca dental, evidenciando as fibras do ligamento periodontal. Resultado O grupo C exibiu feixes espessos e orientados de fibras colágenas maduras, condizentes com aspecto de normalidade. Os grupos com periodontite experimental exibiram desestruturação tecidual severa, com fibras colágenas imaturas e de menor espessura, sendo tais condições mais exacerbadas nos grupos PE-14d e PE-21d. Conclusão As fases iniciais da periodontite apresentam caráter agudo e, portanto, resultam na rápida destruição dos tecidos periodontais de suporte, prejudicando potencialmente a fibrilogênese e a reestruturação do colágeno no ligamento periodontal. infectoinflamatória, infectoinflamatória infecto inflamatória, inflamatória infecto-inflamatória hospedeiro dentário dental C, , (C) 14dias PE14d, PE14d PEd PE 14d d (PE-14d) 21dias PE21d 21d (PE-21d 42dias PE42d. PE42d 42d . 0 1 2 4 (PE-42d Executouse Executou se picrosirius. picrosirius picro sirius. sirius picro-sirius polarizada periodontal maduras normalidade severa espessura PE21d. 21d. PE-21d portanto (C (PE-14d

ABSTRACT Introduction: odontogenic infection is that which has its origin in the structures that form the tooth and the periodontium, and which by extension will affect the maxillary or mandibular bone in its periapical region. This type of infection is usually superficial, localized and limited, but on some occasions a secondary dissemination of the odontogenic infection to other anatomical regions can be observed. Objective: to determine the risk factors for the instauration of odontogenic infections. Methods: a systematic literature review was carried out at the Universidad Regional Autónoma de los Andes between December 2022 and April 2023 on the risk factors for the dissemination of odontogenic infections. Articles in English, Spanish and Portuguese published in PubMed, SciELO and LILACS databases were studied. Development: Of the 512 articles recovered, eight were identified after the screening process, which studied the risk factors for the spread of odontogenic infections. Most belonged to the Journal of Applied Oral Science and 100 % were descriptive studies. Conclusions: Obesity, immunosuppression and diabetes mellitus have a direct influence on the aggravation of odontogenic infections. On the other hand, factors such as oral hygiene, diet, tobacco and drug use are associated with the spread of odontogenic infections.

RESUMEN Introducción: la infección odontogénica es aquella que tiene su origen en las estructuras que forman el diente y el periodonto, y que por extensión afectará al hueso maxilar o mandibular en su región periapical. Este tipo de infecciones generalmente suelen ser superficiales, localizadas y limitadas, pero en algunas ocasiones puede observarse una instauración secundaria de la infección odontogénica hacia otras regiones anatómicas. Objetivo: determinar los factores de riesgo para la para la instauración de infecciones odontogénicas. Métodos: se realizó una revisión sistemática de la literatura en la Universidad Regional Autónoma de los Andes entre diciembre de 2022 y abril de 2023 sobre los factores de riesgo para la instauración de infecciones odontogénicas. Se estudiaron artículos en inglés, español y portugués publicados en las bases de dato PubMed, SciELO y LILACS. Desarrollo: de los 512 artículos recuperados se identificaron ocho tras el proceso de cribado, los cuales estudiaron los factores de riesgo para la instauración de infecciones odontogénicas. La mayor parte pertenecieron a la revista Journal of Applied Oral Science y el 100 % fueron estudios descriptivos. Conclusiones: la obesidad, inmunosupresión, diabetes mellitus, influyen de manera directa en la agudización de las infecciones odontogénicas. Por su parte, factores como la higiene oral, dieta, consumo de tabaco y drogas se encuentran se asocian a la instauración de infecciones odontogénicas.

Abstract Periodontal disease (gingivitis and periodontitis) is an inflammatory process caused by the activity of pathogenic bacteria and their products on the gingival sulcus, with the consequent activation of the immune response. Saliva and crevicular fluid contain a wide variety of enzymes and antimicrobial factors that are in contact with the supragingival and subgingival region, including β-defensins (hBDs). hHBDs are non-glycosylated, cysteine-rich cationic peptides produced by epithelial cells with antimicrobial and immunoregulatory effects, thus contributing to maintaining homeostasis in periodontal tissues. The changes in the microbiota and the immune response from a healthy periodontium to gingivitis and, finally, to periodontitis are complex. Their severity depends on a dynamic balance between bacteria associated with plaque, genetic and environmental factors. Recent advances have made it possible to understand the implication of hBDs in the detection, diagnosis, and therapy of periodontal disease and the relationship between periodontitis and other inflammatory conditions. This review aims to describe the effect of hBDs on the immune response and its use as a possible marker of the inflammatory activity of the periodontal disease.

Resumen La enfermedad periodontal (gingivitis y periodontitis) es un proceso inflamatorio ocasionado por la actividad de bacterias patógenas y sus productos sobre el surco gingival, con la consecuente activación de la respuesta inmunitaria. La saliva y el fluido crevicular contienen una gran variedad de enzimas y factores antimicrobianos que están en contacto con la región supragingival y subgingival; entre ellos, las β-defensinas (hBDs). Las hBDs son péptidos catiónicos no glicosilados ricos en cisteína, producidos por las células epiteliales; tienen efecto antimicrobiano e inmunorregulador; de esta forma, contribuyen al mantenimiento de la homeostasis en los tejidos periodontales. Los cambios en la microbiota y en la respuesta inmunitaria de un periodonto sano a gingivitis y, finalmente, a periodontitis, es compleja. Su severidad depende de un equilibrio dinámico entre las bacterias asociadas a la placa, factores genéticos y ambientales. Los avances recientes han permitido comprender la implicación de las hBDs en la detección, el diagnóstico y la terapéutica de la enfermedad periodontal, así como la relación que hay entre la periodontitis y otras enfermedades inflamatorias. El objetivo de esta revisión es describir el efecto de las hBDs en la respuesta inmunitaria y su utilización como marcadores de la actividad inflamatoria de la enfermedad periodontal.

RESUMO A cárie dentária e suas complicações, condições periodontais e processos infecciosos pós-extração são as causas mais comuns para que os pacientes frequentem serviços de emergência estomatológicas. Estudar sua incidência e os recursos exigidos por seus tratamentos é necessário para a organização de serviços estomatológicos. Identificar as emergências estomatológicas de acordo com as causas que a originam na Policlínica 2 de Manzanillo entre abril e setembro de 2020, durante a situação epidemiológica causada pelo COVID-19, tem sido o objetivo do nosso trabalho. Utilizou-se o método de estudo transversal descritivo em pacientes que foram aos serviços estomatológicos da policlínica 2 em Manzanillo para emergências entre abril e setembro de 2020.O universo era composto por 709 pacientes. O mês de maior fluxo de emergências estomatológicas foi maio com 254 pacientes, predominando entre eles o sexo feminino com 51,9%, en quanto a cárie dentária e suas complicações foi a causa para a qual mais pacientes compareceram, com 82,5%. Das doenças da polpa, a hiperemia da polpa predominou com 361 pacientes para 61,7%, e das doenças periapical foi o abscesso alveolar com 102 casos, para 17,4%. Durante o COVID-19, os serviços estomatológicos mantiveram sua vitalidade por meio de consultas de emergência estomática, cárie dentária e condições periodontais foram as doenças com maior incidência, sendo a hiperemia da polpa aquela que predominou dentro da patologia da polpa e abscesso alveolar agudo dentro do periapical.

ABSTRACT Tooth decay and its complications, periodontal conditions and post-extraction infectious processes are the most common causes so patients attend stomatological emergency services. Studying their incidence and the resources demanded by their treatments is necessary to organize stomatological services. Identifying the stomatological emergencies according to the causes that originate it in the Polyclinic 2 of Manzanillo between April and September 2020, during the epidemiological situation caused by COVID-19, has been the objective of our work. We used the cross-sectional descriptive study method in patients who went to the stomatological services of polyclinic 2 in Manzanillo for emergencies between April and September 2020. The universe consisted of 709 patients. The month of greatest influx of stomatological emergencies was May with 254 patients, predominating among them the female sex with 51.9%, while dental caries and its complications was the cause for which more patients attended, with 82.5%. Of the pulp diseases, pulp hyperemia predominated with 361 patients for 61.7%, and of the periapical diseases it was the alveolar abscess with 102 cases, for 17.4%. During COVID-19, stomatological services maintained their vitality through stomatological emergency consultations, dental caries and periodontal conditions were the diseases with the highest incidence, with pulp hyperemia being the one that predominated within the pulp pathology and acute alveolar abscess within the periapical.

RESUMEN La caries dental y sus complicaciones, las afecciones del periodonto y los procesos infecciosos post-extracción constituyen las causas más comunes por lo que los pacientes asisten a los servicios de urgencia estomatológica. Estudiar su incidencia y los recursos que demandan sus tratamientos es necesario para organizar los servicios estomatológicos. Identificar las urgencias estomatológicas de acuerdo a las causas que lo originan en el Policlínico 2 de Manzanillo entre abril y septiembre de 2020, durante la situación epidemiológica causada por la COVID-19, ha sido el objetivo de nuestro trabajo. Utilizamos el método de estudio descriptivo transversal en pacientes que acudieron por urgencia a los servicios estomatológicos del policlínico 2 de Manzanillo entre los meses abril a septiembre del 2020. El universo estuvo constituido por 709 pacientes. El mes de mayor afluencia de urgencias estomatológicas fue mayo con 254 pacientes, predominando entre ellos el sexo femenino con 51,9%, mientras que la caries dental y sus complicaciones fue la causa por la que más acudieron los pacientes, con un 82,5%. De las enfermedades pulpares fue la hiperemia pulparla que predominó con 361 pacientes para un 61,7%, y de las enfermedades periapicales fue el absceso alveolar con102 casos, para un 17,4%. Durante la COVID-19 los servicios estomatológicos mantuvieron su vitalidad a través de las consultas de urgencias estomatológicas, la caries dental y las afecciones del periodonto fueron las enfermedades de mayor incidencia, siendo la hiperemiapulpar la que predomino dentro de la patología pulpar y el absceso alveolar agudo dentro de la periapical.

ABSTRACT: In patients with periodontitis, pathologic tooth migration is a consequence of loss of periodontal support. The following case report addresses the periodontal and orthodontic treatment of a patient with periodontitis and pathologic tooth migration. The protocol used was the protocol of the Orthodontics and Periodontics Unit of the Faculty of Dentistry of the University of Chile. The periodontal stability has been maintained for at least 6 years after the end of orthodontic treatment, achieving functionality and aesthetics of the natural dentition.

RESUMEN: En pacientes con periodontitis, la migración dentaria patológica es una consecuencia de la pérdida de soporte periodontal. El siguiente reporte de caso aborda el tratamiento periodontal y ortodóncico de una paciente con periodontitis y migración dentaria patológica. El protocolo utilizado fue el protocolo de la Unidad de Ortodoncia y Periodoncia de la Facultad de Odontología de la Universidad de Chile. La estabilidad periodontal se ha mantenido por al menos 6 años luego de finalizado el tratamiento de ortodoncia logran-do funcionalidad y estética de la dentición natural.

RESUMEN: A pesar de los efectos reportados del tabaco sin humo (TS) sobre el periodonto y la alta prevalencia del uso de TS en poblaciones rurales y en hombres, los estudios sobre este tema específico son limitados. El propósito de esta investigación transversal fue medir el producto final de la peroxidación lipídica (como producto final del estrés oxidativo), es decir, malondialdehído (MDA) en la saliva de pacientes con gingivitis, periodontitis crónica y evaluar la influencia del tabaco sin humo en el malondialdehído salival (S-MDA). Se incluyeron en el estudio un total de 30 pacientes con gingivitis, 30 con periodontitis crónica y 30 masticadores de tabaco sin humo con periodontitis crónica y 30 sujetos periodontalmente sanos. Se registraron el índice de placa (PI), el índice gingival (GI), la profundidad de la bolsa de sondeo (PD) y la pérdida de adherencia clínica (CAL), seguidos de la recogida de muestras de saliva estimuladas. Los niveles de MDA en saliva se evaluaron mediante espectrofotometría UV. Hubo un aumento estadísticamente significativo en los niveles de MDA en saliva en gingivitis, periodontitis crónica y en masticadores de tabaco sin humo con periodontitis crónica en comparación con el grupo sano. Los niveles más altos de MDA en saliva en el grupo de gingivitis, periodontitis crónica y masticadores de tabaco sin humo con periodontitis crónica reflejan un aumento de la actividad de los radicales de oxígeno durante la inflamación periodontal.

ABSTRACT: Despite the reported effects of smokeless tobacco (ST) on the periodontium and high prevalence of ST use in rural populations and in males studies on this specific topic are limited. The purpose of this cross-sectional investigation was to measure lipid peroxidation (as an end product of oxidative stress) end product i.e. Malondialdehyde (MDA) in saliva of patients with gingivitis, chronic periodontitis and to assess the influence of smokeless tobacco on Salivary Malondialdehyde (S-MDA). Total 30 patients with gingivitis, 30 with chronic periodontitis and 30 Smokeless Tobacco Chewers with Chronic Periodontitis and 30 periodontally healthy subjects were included in the study. Plaque Index (PI), Gingival Index (GI), Probing Pocket Depth (PD), and Clinical Attachment Loss (CAL) were recorded followed by stimulated Saliva sample collection. Salivary MDA Levels were assessed by UV Spectrophotometry. There was a statistically significant increase in the salivary MDA levels in gingivitis, chronic periodontitis and in smokeless tobacco chewers with chronic periodontitis when compared with healthy group. Higher salivary MDA levels in gingivitis group, chronic periodontitis, and smokeless tobacco chewers with chronic periodontitis reflects increasedoxygen radical activity during periodontal inflammation.

SUMMARY: The aim of the article was to study changes in periodontal tissues in rats with spontaneous periodontitis (SP) and to evaluate the effect of hyaluronic acid (HA) on the state of the periodontium. Wistar rats with signs of SP were divided into 6 groups: 1) intact group; 2) intact animals with HA “HD-1,0 MDa”; 3) SP group; 4) SP with HA “S-2,4 MDa”; 5) SP with HA “ST-2,4 MDa”; 6) SP with HA “HD-1,0 MDa”. The study of the periodontium rats with SP noted the main structural changes (collagen reduction, resorption of alveolar bone, dilatation and stasis of the vessels of the periodontium, gingival papilla and tooth pulp), which were assessed as moderate. Morphological evidence of inflammation was infiltration of neutrophils into the connective tissue of the gums, without the formation of abscesses. Local administration of HA did not cause additional structural damage in periodontal tissues of rats with SP, but also did not affect changes in the microvascular system of periodontium and tooth pulp, periodontal ligaments, only a tendency to inhibit alveolar bone resorption in rats was noted. One can consider the tendency to improve the condition of periodontal tissues in the group of rats injected with high molecular HA and HA with mannitol (2.4 MDa).

RESUMEN: El objetivo del artículo fue estudiar los cambios en los tejidos periodontales en ratas con periodontitis espontánea (PE) y evaluar el efecto del ácido hialurónico (HA) sobre el estado del periodonto. Las ratas Wistar con signos de PE se dividieron en 6 grupos: 1) grupo intacto; 2) animales intactos con HA “HD-1,0 MDa”; 3) grupo PE; 4) PE con HA “S-2,4 MDa”; 5) PE con HA “ST-2,4 MDa”; 6) PE con HA “HD-1,0 MDa”. En las ratas con PS se observaron los principales cambios estructurales (reducción de colágeno, reabsorción del hueso alveolar, dilatación y estasis de los vasos del periodonto, papila gingival y pulpa dentaria), que fueron evaluados como moderados. La evidencia morfológica de inflamación fue la infiltración de neutrófilos en el tejido conectivo de las encías, sin la formación de abscesos. La administración local de HA no causó daño estructural adicional en los tejidos periodontales de las ratas con PE, pero tampoco se produjo cambios en el sistema microvascular del periodonto y en la pulpa dental y ligamentos periodontales.Se observó una tendencia a inhibir la resorción del hueso alveolar. Se puede considerar la tendencia a mejorar el estado de los tejidos periodontales en el grupo de ratas inyectadas con HA de alto peso molecular y HA con manitol (2,4 MDa).