Objetivo Avaliar o desenvolvimento de cárie recorrente após exposição à dentifrícios fluoretados de diferentes concentrações. Material e método: 48 amostras de incisivos bovinos com área exposta de 4x4mm2 foram submetidos a ciclagens de pH por 7 dias e em seguida foram preparadas cavidades com 2mm de profundidade que restauradas com resina microhibrida. Posteriormente, as amostras foram submetidas à ciclagem térmica (350 ciclos) e confeccionados blocos de esmalte distribuídos aleatoriamente em 4 grupos de tratamento (n=12): Grupo A- dentifrício sem flúor (controle negativo); Grupo B- dentifrício 500 ppm; Grupo C- dentifrício 750 ppm; Grupo D- dentifrício 1100 ppm (controle positivo). As amostras foram tratadas com soluções de cada dentifrício (9,6 ml água/1,6 g de dentifrício) por 60 segundos e em seguida imersas em soluções desmineralizante (3 h) e remineralizante (2 h), 3 vezes ao dia, permanecendo posteriormente 18 horas em solução remineralizante. Em seguida, os blocos foram seccionados para análise da profundidade da lesão de cárie em microscopia de luz polarizada. Os dados foram submetidos ao teste paramétrico de Anova complementado pelo teste de Tukey com nível de confiança de 95%. Resultado: Uma menor profundidade da lesão foi verificada no grupo tratado com dentifrício de 1100 ppm F, porém não houve diferença significativa entre os dentifrícios de 500 e 750 ppm F. Conclusão: A utilização de dentifrício fluoretado (1100 ppm) interfere na redução do desenvolvimento de lesões de cárie adjacentes a restaurações.

Objective To evaluate the development of recurrent caries after exposure to fluoride dentifrices with different concentrations. Material and method: 48 samples of bovine incisors (4x4mm2) were exposed to pH cycling for 7 days before the preparation of the cavities (2mm deep). The samples were restored with a microhybrid resin composite. Then, the samples were exposed to thermal cycling (350 cycles) and they were randomly allocated into 4 treatment groups (n = 12): Group A - non-fluoridated dentifrice (negative control); Group B - 500 ppm dentifrice; Group C - 750 ppm dentifrice; group D - 1100 ppm dentifrice (positive control). The samples were treated with solutions of each dentifrice (9.6 ml water/1.6 g dentifrice) for 60 seconds and then were immersed in demineralizing (3 h) and remineralizing (2 h) solutions 3 times a day. Next, the samples were immersed in a remineralizing solution for 18 hours. Then, the blocks were sectioned for examination of the length of the outer caries lesion, using polarized light microscopy. The ANOVA parametric test complemented by the Tukey test with a confidence level of 95%, were used in the statistical analysis. Result: A smaller lesion length was observed in the group treated with the fluoride concentration of 1100 ppm F, but there were no differences between toothpastes with fluoride concentrations of 500 and 750 ppm F. Conclusion: The use of fluoride dentifrices (1100 ppm) reduces the development of caries adjacent to dental restorations.

This work involved an evaluation of calcium hydroxide powder in the absence and presence of CO2. 0.12g of calcium hydroxide powder was used for each of 16 aliquots diluted in 100 mL of deionized water and distributed in 2 samples of 8 aliquots. The indices of pOH, [OH-] and [Ca++] were obtained by mathematical calculations after determining the pH. The results demonstrated that in the presence of CO2, calcium hydroxide showed a marked loss of [OH-] and [Ca++] in relation to the decrease in pH. However, the high alkaline pH of the calcium hydroxide powder was preserved in the absence of CO2, maintaining its reparative and antimicrobial properties.

The purpose of this study was to evaluate the effect of the application of fluoride products on the development of enamel caries in deciduous teeth. A total of 108 deciduous teeth were chosen for the study. Acid-resistant varnish was applied on the teeth, leaving only one area of 5 mm x 1 mm of dental enamel exposed. The teeth were allocated randomly to one of the following groups: 1) control - toothpaste without fluoride; 2) 1.23% fluoride gel; 3) Duraflur fluoride varnish; 4) Duraphat fluoride varnish; 5) Fluorniz fluoride varnish; 6) Fluorphat fluoride varnish; 7) varnish with Duofluorid; 8) 12% silver fluoride diamine (Cariestop); 9) children's fluoride toothpaste (500 ppm). The tested products were applied on the teeth according to the manufacturer's recommendations and the teeth were stored in a moist environment for 24 hours. Each group of teeth was then subjected to a pH cycling model for 14 days, after which the teeth were cut through the center for an analysis of the depth of the carious lesion by polarized light microscopy. Comparisons were made between the treatments and the control group. The mean lesion depth values were 318 μm ± 39 (control), 213 μm ± 27 (fluoride gel), 203 μm ± 34 (Duraflur), 133 μm ± 25 (Duraphat), 207 μm ± 27 (Fluor-niz), 212 μm ± 27 (Fluorphat), 210 ± 28 (Duofluorid), 146 ± 31 (Cariestop) and 228 ± 24 (fluoride toothpaste). None of the products used here was able to completely prevent the formation of lesions. The highest cariostatic effect was achieved by fluoride varnish Duraphat and the lowest by the fluoride toothpaste.

Uma grande variação de prevalência de bruxismo infantil é relatada na literatura (5% a 81%), dificultando o estabelecimento de parâmetros comparativos. O objetivo deste estudo foi determinar a prevalência de bruxismo excêntrico noturno (BEN) e suas características em 213 crianças de 2 a 11 anos, sendo 130 crianças atendidas na Clínica de Odontologia Infantil da FOP-UNICAMP e 83 crianças atendidas em consultório particular. Os dados foram coletados mediante entrevista dirigida ao responsável pela criança e ao seu dentista e analisados estatisticamente através dos testes e de Kruskal-Wallis. Os resultados mostraram uma prevalência de BEN de 28,64% (n=61). A diferença de freqüência entre crianças bruxômanas e não bruxômanas não foi significativa em relação ao local de atendimento (FOP versus consultório) (p>0,05). Considerando o tipo de dentição, 39,34% das crianças com dentadura decídua e 24,34% com dentição mista eram bruxômanas (p<0,05). Entre os bruxômanos (n=61), 27,87% eram crianças ansiosas e 31,15% eram hiperativas. Cinqüenta e um por cento das crianças com BEN tinham problemas respiratórios e/ou alérgicos. Em relação à idade, observou-se uma maior prevalência de BEN em crianças de 2 a 5anos e de 10 a 11 anos.

Epidemiological studies have reported a wide range of incidence of bruxism in children (5% to 81%), which makes difficult the establishment of comparative parameters. The aim of this study was to record the prevalence of nocturnal bruxism (NB) and its features in two hundred and thirteen 2-11-year-old children. Interviews were performed with 130children receiving dental treatment at a school of dentistry (FOP-UNICAMP) and 83 children attended at private dental offices. A structured questionnaire was used to interview the children's parents/relatives and dentist. Data were analyzed by test and Kruskal-Wallis test. Prevalence of NB was 28.64% (n=61). Difference between frequencies of bruxers and non-bruxers was not significant concerning the place of dental treatment (p>0.05). In relation to dentition, 39.34% of the children with primary teeth and 24.34% with mixed dentition were bruxers (p<0.05). Among the bruxers (n=61), 27.87% were anxious and 31.15% were hyperactive children. Fifty-one per cent of the bruxers had respiratory problems and/or allergy. High prevalence of NB was recorded for 2-5-year-old and 10-11-year-old children.