Abstract The objective of the present study was to investigate the frequency of oral leukoplakia and oral erythroplakia among young patients from three Brazilian reference centers in Oral and Maxillofacial Pathology. A retrospective study was carried out from 2011 to 2021 on 861 patients diagnosed with oral leukoplakia and oral erythroplakia. Demographic and clinicopathological data were evaluated. Fisher’s exact test was used to evaluate the association among sex, age, anatomical location, and histopathological diagnosis. A total of 83 (9.64%) cases involved young patients (aged <40 years). Among these, biopsy records were included in 31 (37.34%) cases, all of which received a clinical diagnosis of oral leukoplakia. Seventeen (54.84%) patients were female, mostly in their fourth decade of life (n = 22/70.97%), and their mean age at diagnosis was 32.61(± 5.21) years. Among informed cases, seven (22.58%) patients were smokers. The lateral border of the tongue (n = 9/29.03%) was the most affected site. In 13 (41.94%) cases, oral leukoplakias showed a homogeneous appearance. The mean size of the lesions was 1.47 cm (0.2–3.0 cm) and the mean time of disease progression was 64.37 (± 65.90) months. The histopathological analysis showed that 11 cases (35.48%) exhibited some degree of epithelial dysplasia. Acanthosis and/or hyperkeratosis were observed in 20 cases (64.52%). No significant associations were observed between sex and anatomical location, age and anatomical location, nor between sex and histological diagnosis (p > 0.05). Oral leukoplakia and oral erythroplakia are uncommon diseases in young patients. In this population, oral leukoplakia shows a slight predilection for women aged between 30 and 39 years. Pathology 201 202 86 evaluated Fishers Fisher s location 8 9.64% 964 9 64 (9.64% 40 <4 years . years) these 3 37.34% 3734 37 34 (37.34% 54.84% 5484 54 84 (54.84% female n 22/70.97%, 227097 22/70.97% , 22 70 97 22/70.97%) 32.61± 3261 32.61 ± 32 61 32.61( 5.21 521 5 21 22.58% 2258 58 (22.58% smokers 9/29.03% 92903 29 03 site 1 41.94% 4194 41 94 (41.94% appearance 147 47 1.4 0.2–3.0 0230 0 2 (0.2–3. 6437 64.3 ( 65.90 6590 65 90 months 35.48% 3548 35 48 (35.48% dysplasia andor or 64.52%. 6452 64.52% 52 (64.52%) p 0.05. 005 0.05 05 0.05) population 9.64 96 6 (9.64 4 < 37.34 373 (37.34 54.84 548 (54.84 22709 22/70.97 7 326 32.6 5.2 22.58 225 (22.58 9/29.03 9290 41.94 419 (41.94 14 1. 0.2–3. 023 (0.2–3 643 64. 65.9 659 35.48 354 (35.48 645 64.52 (64.52% 00 0.0 9.6 (9.6 37.3 (37.3 54.8 (54.8 2270 22/70.9 32. 5. 22.5 (22.5 9/29.0 929 41.9 (41.9 0.2–3 02 (0.2– 65. 35.4 (35.4 64.5 (64.52 0. 9. (9. 37. (37. 54. (54. 227 22/70. 22. (22. 9/29. 92 41. (41. 0.2– (0.2 35. (35. (64.5 (9 (37 (54 22/70 (22 9/29 (41 0.2 (0. (35 (64. (3 (5 22/7 (2 9/2 (4 (0 (64 22/ 9/ (6

Abstract There is an interaction between dendrocytes and mast cells in the skin. However, in elastosis-related diseases such as actinic cheilitis (AC) and lower lip squamous cell carcinoma (LLSCC), this interaction remains unknown. We investigated the presence of intact and degranulated mast cells in AC and LLSCC. Associations of mast cells with factor XIIIa+ dendrocytes and inflammatory infiltrate were assessed. Forty cases of AC (20 with low-grade and 20 with high-grade epithelial dysplasia), 50 cases of LLSCC, and 10 cases of normal oral mucosa were evaluated. Toluidine blue staining was performed to identify mast cells, and mast cell densities were calculated in the inflammatory infiltrate. Factor XIIIa+ dendrocytes were immunohistochemically quantified. The highest ratio of intact/degranulated mast cells density was detected in LLSCC (5.9 cells/mm2), followed by AC with high-grade epithelial dysplasia (4.8 cells/mm2). Statistically significant differences were found in the density of intact mast cells compared to degranulated mast cells in AC with low-grade epithelial dysplasia (p<0.001), AC with high-grade epithelial dysplasia (p=0.005), and LLSCC (p<0.001). A positive correlation between degranulated mast cells and total inflammatory infiltrate (p=0.03) was observed in the LLSCC group. The expression of factor XIIIa+ dendrocytes was highest in AC with low-grade epithelial dysplasia (16.5 cells/mm2). The link between mast cell density, factor XIIIa+ dendrocytes, and inflammatory infiltrate indicates a potential crosstalk in lip carcinogenesis. skin However elastosisrelated elastosis related (AC , (LLSCC) unknown XIIIa assessed (2 lowgrade low grade 2 highgrade high dysplasia, dysplasia) 5 1 evaluated quantified intactdegranulated 5.9 59 9 (5. cells/mm2, cellsmm2 cellsmm cells/mm2 mm2 mm cells/mm2) 4.8 48 4 8 (4. cells/mm2. . p<0.001, p0001 p p<0.001 0 001 (p<0.001) p=0.005, p0005 p=0.005 005 (p=0.005) p<0.001. p=0.03 p003 03 (p=0.03 group 16.5 165 16 (16. carcinogenesis (LLSCC ( 5. (5 cells/mm 4. (4 p000 p<0.00 00 (p<0.001 p=0.00 (p=0.005 p=0.0 p00 (p=0.0 16. (16 p<0.0 (p<0.00 (p=0.00 p=0. p0 (p=0. (1 p<0. (p<0.0 p=0 (p=0 p<0 (p<0. p= (p= p< (p<0 (p (p<

Abstract: The aim of this study was to determine the presence of immature CD1a+ and mature CD83+ dendritic cells in oral squamous cell carcinoma, to compare immunoreactivity between smokers and nonsmokers, and to correlate the results with histopathological grading. In this observational study, twenty-eight paraffin-embedded biopsies of oral squamous cell carcinoma were retrospectively retrieved and submitted to immunohistochemistry for immature CD1a+ and mature CD83+. Descriptive and statistical analyses were performed. The sample consisted of 18 man (64.3%) and 10 women (35.7%), with a mean age of 64.6 years in the nonsmoker group and 53.2 years in the smoker group. The tongue (11 cases, 39.2%) was the most commonly affected anatomical site, followed by gingiva (6 cases, 21.4%). Histopathological grading revealed 7 low-grade and 7 high-grade malignancy cases in each group, and no correlation with the number of positive DCs. The number of immature CD1a+ was not significantly different between smoker and nonsmoker groups, while a lower number of mature CD83+ was detected in the smoker group (p = 0.001). Smoking changes the oral immune system and decreases the ability to activate and mature dendritic cells, which may influence the development and progression of oral squamous cell carcinoma.

Abstract The aim of this study was to investigate the prevalence of oral and maxillofacial lesions among children from representative regions of Brazil. A retrospective descriptive study was conducted. Biopsy records comprising the period from 2000 to 2015 were obtained from the archives of three Brazilian oral pathology referral centers. A total of 32,506 biopsy specimens were analyzed, and specimens from 1,706 children aged 0–12 years were selected. Gender, age, anatomical location and histopathological diagnosis were evaluated. Descriptive statistics was carried out. Likelihood ratio tests were used to evaluate the association between the categorical variables. The level of significance was set at 0.05. The post-hoc test was used to identify the subgroups that significantly differed from one another, and the Bonferroni correction was applied. A total of 1,706 oral and maxillofacial lesions were diagnosed in pediatric patients, including 51.9% girls. Oral mucocele was the most prevalent reactive/inflammatory lesion (64%). The most commonly affected sites were the lips (34.5%) and mandible (19.9%). A significant association was observed between age and the group of lesions of the oral cavity (p < 0.001), and between age and anatomical location (p < 0.001). Pediatric oral and maxillofacial lesions were frequent and showed wide diversity, with the prevalence of mucocele. Knowledge of oral lesions is important for pediatric dentists worldwide, since it provides accurate data for the diagnosis and oral health of children.

Resumo Este estudo avaliou o pH, radiopacidade, efeito antimicrobiano, citotoxicidade e biocompatibilidae de materiais obturadores de dentes decíduos. Foram avaliados o cimento de óxido de zinco e eugenol (OZE), Vitapex e pasta Calen espessada com óxido de zinco (OZ), comparativamente a um material experimental à base de MTA. A radiopacidade foi testada usando uma escala milimetrada de alumínio, com um sensor digital. O pH dos materiais também foi avaliado nos períodos de 1, 4, 12 h; 1, 3, 7, 15, e 30 dias (n=5). O teste de contato direto foi utilizado para avaliação da atividade antimicrobiana dos materiais conta uma cepa de Enterococcus faecalis após incubação por 1, 4, 12, e 24 h (n=5). Para avaliação da citotoxicidade foi utilizado o teste de MTT para avaliação da viabilidade celular. No teste de biocompatibilidade, ratos Wistar receberam implantes subcutâneos contendo cada material obturador (n=5). Após biópsia, os tecidos foram submetidos à avaliação histológica em períodos de 15, 30 e 60 dias. Os resultados de radiopacidade, pH, ação antimicrobiana e citotoxicidade foram analisados usando os testes ANOVA e Tukey. Os dados histológicos foram submetidos ao teste de Kruskal-Wallis. O material experimental apresentou a menor radiopacidade (3.28 mm Al) e apresentou um pH superior a 12,0 durante todo o período experimental. O material experimental apresentou o maior efeito antimicrobiano, eliminando mais de 99,97% das bactérias em um período de 4 h. O Vitapex permitiu uma maior viabilidade celular em comparação aos demais materiais avaliados. Inicialmente, os testes de biocompatibilidade demonstraram inflamação de moderada a severa em todos os grupos. Após 60 dias, apenas o grupo Calen+ OZ apresentou inflamação moderada, enquanto os outros materiais demonstraram predominantemente a indução de inflamação leve. Os resultados demonstraram que o material experimental à base de MTA exibiu comportamento satisfatório com relação às propriedades avaliadas. Estudos adicionais, in vivo, são necessários para uma melhor avaliação do material.

Abstract This study assessed the pH, radiopacity, antimicrobial effect, cytotoxicity and biocompatibility of endodontic filling materials for primary teeth. Zinc oxide eugenol (ZOE), Vitapex and Calen paste thickened with zinc oxide (ZO) were evaluated in comparison to an experimental MTA-based material. Radiopacity was tested using a graduated aluminum stepwedge with a digital sensor (n=5). The materials pH was recorded at 1, 4, 12 h; 1, 3, 7, 15 and 30 days (n=5). Direct contact test was used to assess the antimicrobial efficacy against Enterococcus faecalis after 1, 4, 12, 24 h (n=5). Cytotoxicity assay used MTT test for cell viability after incubation for 1, 3 and 7 days (n=5). For biocompatibility test, Wistar rats had received implants containing each material (n=5). The biopsied tissues were histologically analyzed after 15, 30 and 60 days. The results of radiopacity, pH, antimicrobial capacity and cytotoxicity were analyzed using ANOVA and Tukey tests. The histological data were submitted to Kruskal-Wallis test. The experimental material presented the lowest radiopacity (3.28 mm Al) and had a pH>12.0 throughout the test period. The experimental material showed the highest antibacterial effect, killing over 99.97% bacteria in 4 h. Vitapex presented the highest cell viability. Initially, biocompatibility test showed moderate to severe inflammation in all groups. After 60 days, Calen+ZO group showed moderate inflammation, while the others showed predominantly mild inflammatory reaction. The present results demonstrated that the experimental MTA-based material exhibited satisfactory behavior regarding the studied properties. Additional in vivo studies are necessary for a better evaluation of the material.

Resumo O objetivo desse estudo foi avaliar o perfil clínico-demográfico dos casos de carcinoma de células escamosas oral (CCEO) oral registrados em um centro de diagnóstico bucal no Sul do Brasil. Oitocentos e seis indivíduos com CCEO de 1959 a 2012 foram incluídos no estudo. As variáveis coletadas foram: sexo, idade, ocupação de acordo com o ambiente de trabalho, consumo de álcool e tabaco, cor de pele, localização do tumor, tipo histológico, aparência clínica, tamanho, tempo de evolução, presença de dor e metástase linfonodal. Foi realizada análise descritiva e as associações entre as variáveis foram avaliadas usando qui-quadrado e teste exato de Fisher, com nível de confiança de 5%. CCE oral foi mais comum em homens (76,6%), entre 51 e 70 anos de idade (53,9%). Os sítios mais frequentes foram vermelhão de lábio inferior (23,3%), língua (20,2%) e gengiva/rebordo alveolar (18,1%). Houve uma forte associação entre ocupação em ambiente externo e cor de pele branca com CCEO em lábio. Lesões intraorais de CCEO foram comumente mais dolorosas, maiores que 2 cm e apresentaram metástase linfática. Em conclusão, a maioria dos resultados confirma os dados da literatura em relação a sexo, idade, localização do tumor e ocupação. Além disso, as correlações positivas entre CCE em lábio e ocupação, entre CCEO em lábio e cor de pele branca, e entre lesões maiores e presença de dor/metástase cervical também corroboram os dados da literatura.

Abstract The aim of this study was to evaluate the demographic and clinical profile of the oral squamous cells carcinoma (OSCC) cases registered in a center of oral diagnosis in southern Brazil. Eight hundred and six individuals with OSCC from 1959 to 2012 were included in this study. The variables recorded were: sex, age, occupation according to workplace, alcohol and tobacco consumption, skin color, tumor location, histological type, clinical appearance, size, evolution time, presence of pain and lymph node metastasis. Descriptive analysis was performed and the associations between variables were assessed using the chi-square and Fisher’s exact test, with a confidence level of 5%. OSSC was more common in males (76.6%) aged between 51 to 70 years (53.9%). The most frequent sites were lower lip vermilion (23.3%), tongue (20.2%) and gingiva/alveolar ridge (18.1%). There was a strong association between outdoor occupation and white skin color with lip squamous cell carcinoma (LSCC). OSCC intraoral lesions were commonly more painful, larger than 2 cm and presented lymphatic metastasis. In conclusion, most of the results confirm the data from literature about sex, age, tumor location and occupation. Moreover, the positive correlations between LSCC and occupation, between LSCC and white skin color, and between bigger lesions and presence of pain/cervical metastasis also corroborate the literature data.

O câncer bucal é uma doença relativamente comum a nível mundial e que vem aumentando a sua incidência ao longo dos anos. No Brasil, milhares de novos casos surgem e o cirurgião-dentista é o profissional que precisa estar preparado para diagnosticar, prevenir, intervir e orientar os pacientes quanto a doença, seu tratamento e as complicações inerentes ao mesmo. Não existe, atualmente, uma forma de tratamento sistêmico para o câncer que tenha a capacidade de destruir as células alteradas, sem causar dado ou a morte das células normais. A cirurgia combinada com a radioterapia é uma das formas mais comuns para tratamento dos tumores malignos de cabeça e pescoço. Essa modalidade de tratamento tem obtido altos índices de cura e sobrevida aos pacientes, porém, os efeitos colaterais existentes são graves e capazes de provocar morbidade aos pacientes, diminuindo a sua qualidade de vida. Desse modo, o objetivo do trabalho é realizar uma revisão de literatura sobre as principais complicações decorrentes do tratamento radioterápico, enfatizando a conduta do cirurgião-dentista frente a estas alterações.

Oral cancer is a relatively common disease worldwide and its incidence rate has increased over the years. In Brazil, thousands of new cases emerge and the dental surgeon is the professional who diagnoses, prevents, intervenes in and instructs patients in regard to the disease, its treatment and related complications. There is no current form of systemic treatment able to destroy abnormal cells without causing harm or death to normal cells. Surgery combined with radiation is one of the most common treatments for malignant tumors in the head and neck. This modality of treatment has resulted in high rates of cure and survival. There are, however, severe side effects, causing morbidities and reducing patients' quality of life. Hence, this study's aim was to perform a literature review addressing the main complications arising form radiation therapy while emphasizing the conduct of dental surgeons in the face of these changes.

Este estudo avaliou a influência da adição de cetramida e polipropilenoglicol ao hipoclorito de sódio (Hypoclean) na capacidade de dissolução pulpar do hipoclorito de sódio (NaOCl). Fragmentos de tecido pulpar bovino, com peso e volume padronizados foram imersos por períodos de 5, 15 e 30 min em 2 mL de NaOCl ou Hypoclean nas concentrações 5,25%, 2,5%, 1%, 0,5% e 0,25%. Após a imersão nas soluções testadas, os fragmentos foram novamente pesados. Como controle, foi utilizada água destilada. O percentual de perda tecidual foi considerado para análise estatística (ANOVA univariada, SPSS, v. 17.0). Não houve dissolução tecidual no grupo controle. A solução de NaOCl combinada a surfactantes (Hypoclean) dissolveu um maior percentual de tecido pulpar (p<0,05) que o NaOCl sem associações. A dissolução tecidual foi diretamente dependente da concentração das soluções (p<0,05), assim como do tempo de exposição às soluções (p<0,05). A adição dos surfactantes cetramida e polipropilenoglicol ao NaOCl em concentrações altas e baixas aumentou significativamente sua capacidade de dissolução do tecido pulpar.

This study evaluated the influence of the addition of cetrimide and polypropylene glycol to sodium hypochlorite (NaOCl) on its capacity to dissolve pulp tissue. Bovine pulp fragments with standardized weight and volume were immersed for 5, 15 and 30 min in 2 mL of NaOCl and Hypoclean (NaOCl added with cetrimide and polypropylene glycol) solutions at 5.25%, 2.5%, 1%, 0.5% and 0.25% and afterwards re-weighted. Distilled water was used as a control. The percentage of tissue loss was considered for statistical analysis (univariate ANOVA, SPSS, v. 17.0) at 5% significance level. There was no tissue dissolution in the control group. NaOCl added with surfactants (Hypoclean) dissolved more pulp tissue (p<0.05) than NaOCl alone. Tissue dissolution was directly dependent on the concentration of solutions (p<0.05), and also on the time range (p<0.05). The combination of NaOCl at high and low concentrations with the surfactants cetrimide and polypropylene glycol increased significantly its capacity to dissolve pulp tissue.

Este estudo investigou a expressão das glicoproteínas Tenascina (TN) e Fibronectina (FN) da matriz extracelular no reparo pulpar após capeamento com hidróxido de cálcio (HC), seguindo diferentes protocolos de hemostasia. Cavidades de classe I com exposição pulpar foram preparadas em 42 terceiros molares humanos indicados para extração. Diferentes agentes hemostáticos (solução salina a 0,9%, hipoclorito de sódio a 5,25% e clorexidina a 2%) foram usados e as polpas foram capeadas com cimento de HC. Após 7, 30 ou 90 dias, os dentes foram extraídos, fixados em formalina e preparados para análise imunoistoquímica. Os agentes hemostáticos não influenciaram a expressão de TN e FN. Ambas glicoproteínas foram encontradas em todo tecido pulpar, ao redor das fibras colágenas e estiveram ausentes nos tecidos mineralizados. Na pré-dentina, a TN mostrou forte imunoexpressão e a FN teve uma expressão variável. Após 7 dias, foi observada uma expressão levemente mais pronunciada no lugar da exposição pulpar. Aos 30 dias, a TN e a FN demonstraram uma expressão mais forte sob a barreira dentinária e aos 90 dias, uma expressão fina e linear da TN e FN apresentava-se delimitando a dentina reparativa. Em conclusão, os agentes hemostáticos não influenciaram e expressão da TN e da FN. A imunoexpressão da TN e FN foi observada em diferentes regiões e períodos, demonstrando o seu papel no reparo pulpar.

This study investigated the expression of extracellular matrix glycoproteins tenascin (TN) and fibronectin (FN) in pulp repair after capping with calcium hydroxide (CH), following different hemostasis protocols. Class I cavities with a pulp exposure were prepared in 42 human third molars scheduled for extraction. Different hemostatic agents (0.9% saline solution, 5.25% sodium hypochlorite and 2% chlorhexidine digluconate) were used and pulps were capped with CH cement. After 7, 30 or 90 days, teeth were extracted, formalin-fixed, and prepared for immunohistochemical technique. Hemostatic agents did not influence the expression of TN and FN. Both glycoproteins were found in the entire the pulp tissue and around collagen fibers, but were absent in the mineralized tissues. In the predentin, TN showed positive immunostaining and FN had a variable expression. Within 7 days post-treatment, a slightly more pronounced immunostaining on the pulp exposure site was observed. Within 30 days, TN and FN demonstrated a positive expression around the dentin barrier and at 90 days, a thin and linear expression of TN and FN was delimitating the reparative dentin. In conclusion, hemostatic agents did not influence TN and FN expression. Immunostaining for TN and FN was seen in different regions and periods, demonstrating their role in pulp repair.

O carcinoma espinocelular (CEC) de boca é o quinto mais comum no mundo. O efeito de alguns fatores etiológicos está bem estabelecido na literatura, como o fumo e o consumo de álcool. No entanto, aproximadamente 15 a 20% dos casos de câncer bucal acometem pacientes sem os tradicionais fatores de risco e isso se traduz em inúmeros casos de CEC bucais em indivíduos não fumantes e não etilistas. Além disso, dados da literatura têm sugerido uma possível associação entre o vírus papiloma humano (HPV) e o carcinoma espinocelular de boca. Em virtude desse aspecto, desenvolveu-se este trabalho na perspectiva de revisar as características mais associadas a esse grupo de pacientes, contribuindo assim para a melhoria no diagnóstico e no acompanhamento dos mesmos. Os artigos que serviram de apoio para o estudo foram localizados por meio da base de dados Pubmed, utilizando os descritores "epidemiologia", "carcinoma espinocelular de boca", "fatores de risco" e "vírus papiloma humano". É importante avaliar pacientes sem tais fatores de risco, uma vez que o conhecimento pode auxiliar na análise de outras características associadas com a ocorrência de carcinoma. Além disso, possibilita melhorar o manejo clínico e monitoramento.

Oral squamous cell carcinoma (OSCC) is the fifth most common type of cancer in the world. The effect of some etiological factors is well established in the literature, such as consumption of tobacco and alcohol. However, approximately 15 to 20% of all oral cancer cases occur in patients without the traditional risk factors, reflecting in numerous cases of OSCC in non-smokers and non-alcoholic drinkers. Also, several studies have suggested a possible association between human papillomavirus and OSCC. Under these aspects, the purpose of this study is to address cases of oral cancer in non-smokers and non-drinkers focusing on the role of HPV, thus contributing to improve the diagnosis and monitoring of OSCC. A computer database search was performed using the Pubmed database. The search key words were: epidemiology, oral squamous cell carcinoma, risk factors and human papillomavirus. It is important to assess patients without the potential risk factors, since this knowledge may help identifying other features associated with the occurrence of oral cancer, enabling an appropriate clinical management and monitoring.

OBJETIVO: O objetivo deste trabalho é revisar e discutir brevemente a literatura sobre CA e apresentar o relato de um caso da remoção de CA em lábio superior com 2 anos de acompanhamento. DESCRIÇÃO DO CASO: Mulher com 53 anos queixava-se de lesão indolor, esteticamente desagradável, dura e de coloração marrom na área cutânea do lábio superior. A lesão havia crescido rapidamente nos últimos 30 dias (tamanho: ~10×5 mm), e estava associada à remoção de pêlos com cera quente. Excisão cirúrgica foi o tratamento escolhido para diferenciar a lesão de carcinoma espinocelular (CEC). Uma incisão em forma oval aprofundada em forma de cunha foi realizada para remoção da lesão e melhor aproximação das bordas após a síntese. A análise histopatológica confirmou o diagnóstico de CA. Após 2 anos, a paciente estava completamente satisfeita com o tratamento, e nenhuma cicatriz era evidente. CONCLUSÃO: Devido à dificuldade na diferenciação clínica entre CA e CEC, e o risco de formação de cicatriz esteticamente desagradável quando da resolução espontânea do CA, a remoção cirúrgica pode ser considerada o tratamento de escolha para CA solitário.

PURPOSE: The aim of this paper is to briefly review and discuss the literature about KA and present a case report with a 2-year follow-up of the removal of a KA lesion in the upper lip. CASE DESCRIPTION: A 53-year-old woman complained of a painless, aesthetically unpleasant brownish, hard lesion in the cutaneous area of the upper lip. The lesion had grown rapidly in the last 30 days (size: ~10×5 mm), and was associated with a hot waxing hair removal. Surgical excision was the treatment chosen in order to differentiate the lesion from squamous cell carcinoma (SCC). An oval-shaped incision was created with an in-depth wedge shape for the removal of the lesion and better approximation of the edges after synthesis. Histopathological analysis confirmed the diagnosis of KA. After 2 years, the patient was completely satisfied with the treatment, and no scar was evident. CONCLUSION: Due to the clinical difficulty in differentiating KA from SCC and the risk for formation of an aesthetically unpleasant scar upon spontaneous resolution of KA, surgical removal might be considered the treatment of choice for a solitary KA.

OBJECTIVE: Actinic cheilitis (AC) is a precancerous lesion of the lip vermillion caused by prolonged exposure to ultraviolet light. The aim of this study was to evaluate the effect of 3% diclofenac in 2.5% hyaluronic acid gel in the treatment of AC. METHODS: Thirty-four patients with chronic AC were treated twice a day with topical diclofenac during a period of 30 to 180 days. The individuals were followed up every 15 days by means of clinical examination and digital photographic documentation. RESULTS: Of the 27 patients that completed the study, 12 (44%) showed complete remission of the whitish plaques and exfoliative areas, and 15 (56%) had partial remission of the clinical picture of cheilitis. The latter group was submitted to excision of the leukoplakic areas which diagnosis varied from mild to moderate epithelial dysplasia. CONCLUSIONS: The results suggest a promising role for diclofenac in hyaluronic acid gel in the treatment of AC. This treatment has the advantages of not being invasive and showing few side effects.

Despite the large number of published cases about oral and maxillofacial pediatric lesions, the literature is scarce on epidemiological studies regarding the prevalence of these entities. This study retrieved oral and maxillofacial pediatric lesions from the Center of Diagnosis of Oral Diseases (CDDB) at the Dental School of the Federal University of Pelotas (UFPEL), comprising a 20-year period (1983-2002). From the total of 9,465 biopsies received in this period, 625 (6.6%) were from children aged 0 to 14 years. Regardless of the histopathological diagnosis, patient data referring to lesion location, sex and age were collected. Diagnoses were grouped in 13 categories. As much as 89% of the cases occurred in patients aged 7 to 14 years (53% in females and 47% in males). Mucocele (17.2%) was the most common type of lesion, followed by dentigerous cyst (8.6%). In the category of odontogenic tumors, odontoma was the most frequent lesion (64.2%). Malignant lesions were observed in a small section of the sample (1.2%). Generally, the results of the present study are in line with those reported in the literature concerning the most prevalent lesions in the pediatric population. Most lesions were benign, and malignant lesions were diagnosed in a very small part of the sample.

Estudos prévios mostram que os mastócitos estão significantemente aumentados na pele irradiada por ultra-violeta e neoplasias. A queilite actínica (QA) é uma lesão causada por excessiva exposição solar, que pode transformar-se em carcinoma espinocelular de lábio. O objetivo deste estudo foi comparar o número de mastócitos em 4 grupos: MON = mucosa oral normal (n=6); QADL = queilite actínica com displasia leve (n=13); QADS = queilite actínica com displasia severa (n=13); e CECL = carcinoma espinocelular de lábio (n=15). Os cortes foram corados pela técnica histoquímica do azul de toluidina e a contagem visual foi realizada utilizando um retículo acoplado à ocular do microscópio. Um observador calibrado realizou a contagem em 5 campos por caso em magnificação de ×400. A média de mastócitos por grupo foi maior no CECL (40,1), seguida da QADL (30,5), QADS (28,6) e MON (12,2). Houve diferença estatisticamente significante entre MON e QADL (p<0,05) e entre MON e CECL (p<0,05). A maior densidade de mastócitos na QA e no CECL em relação à MON sugere um papel para os mastócitos no desenvolvimento dessas lesões.

Previous studies have shown that the number of mast cells is increased in ultraviolet (UV) irradiated skin and in neoplasias. Actinic cheilitis (AC) is a lesion caused by excessive exposure to sunlight that can transform into lip squamous cell carcinoma. The aim of this study was to compare the number of mast cells in 4 groups: NOM = normal oral mucosa (n=6); MDAC = mild dysplasia in actinic cheilitis (n=13); SDAC = severe dysplasia in actinic cheilitis (n=13); and LSCC = lip squamous cell carcinoma (n=15). The sections were stained by histochemical technique of blue toluidine and visual counting was performed with the aid of a reticulum coupled to the microscope ocular. A calibrated observer performed the count in 5 fields by case at ×400 magnification. The largest mean number of mast cells per group was observed in LSCC (40.1), followed by MDAC (30.5), SDAC (28.6) and NOM (12.2). There were significant differences between NOM and MDAC (p<0.05) and between NOM and LSCC (p<0.05). The increased density of mast cells observed in AC and in LSCC compared to NOM suggests a role for the mast cells in the development of these lesions.