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.

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The objective of this study was to evaluate the influence of a cola soft drink (CSD) and coffee on the microhardness and surface roughness of composite resin. Fifty cavities were prepared on the vestibular surface of bovine incisors and restored with nanoparticulate resin. The teeth were divided into five groups (n = 10): group A (control), immersion in artificial saliva (AS) for 14 days; group B, immersion in coffee for 15 min (3×/day) for 7 days followed by immersion in AS for another 7 days; group C, immersion in CSD for 15 min (3×/day) for 7 days followed by immersion in AS for another 7 days; group D, immersion in AS for 7 days, immersion in coffee for 15 min (3×/day) for 7 days; group E, immersion in AS for 7 days, immersion in CSD for 15 min (3×/day) for 7 days. After the immersion periods the specimens were analyzed for their microhardness and surface roughness. The data were subjected to analysis of variance (ANOVA) followed by t-test with 5% significance. Group A presented the highest average microhardness and lowest surface roughness, so it was possible to conclude that the consumption of CSD and coffee alters the microhardness and surface roughness of new restorations.

This in vitro study evaluated the marginal gap at the composite tooth/resin interface in class V cavities under the influence of two insertion techniques and a curing system by means of atomic force microscopỹ AFM!. Forty enamel and dentin cavities were prepared on the buccal surface in bovine teeth with quadratic forms measuring 2 mm ϫ 2 mm and depth of 1.5 mm. The teeth were then divided into four groups: group A, 10 cavities were restored in one increment, light cured by halogen light; group B, 10 cavities filled with bulk filling, light cured by the light emitting diodes~LED!; group C, 10 cavities were restored by the incremental technique, light cured by halogen light; group D, 10 cavities were restored by the incremental technique, light cured by the LED. The teeth underwent the polishing procedure and were analyzed by AFM for tooth/ restoration interface evaluation. The data were compared between groups using the nonparametric KruskallWallis and Mann-Whitney tests~p , 0.05!. The results showed a statistically significant difference between groups A and B and groups A and C. It was concluded that no insertion and polymerization technique was able to completely seal the cavity.

This work involved an evaluation of calcium hydroxide powder in the absence and presence of CO 2 . 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. ] in relation to the decrease in pH. However, the high alkaline pH of the calcium hydroxide powder was preserved in the absence of CO 2 , maintaining its reparative and antimicrobial properties.

ResumoObjetivo: 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 4x4mm 2 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.Descritores: Cárie dentária; dentifrícios; materiais dentários. AbstractObjective: To evaluate the development of recurrent caries after exposure to fluoride dentifrices with different concentrations. Material and method: 48 samples of bovine incisors (4x4mm 2 ) 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 dev...

Objecti ve: To evaluate the electronic measurement of the root canal length in primary molars either with or without the presence of the permanent successor between the roots of the primary molars, in comparison to two conventi onal radiographic techniques. Method: Thirty primary molars were selected for this study. Forty-six roots with less than 1/3 root resorpti on were used. Aft er preparati on of the access cavity, direct measurement of the canal length was done with a digital pachymeter and radiographs. The electronic root canal length measurement was done in two moments. In the fi rst, with the presence of permanent successor, the results were compared to those obtained with radiographs used for the modifi ed Ingle's root canal length measurement technique. In the second moment, without the permanent successor, the results were compared to those obtained with radiographs made by the apical retrograde canal length measurement technique. The data were analyzed stati sti cally by the Chi-square test at 5% signifi cance level. Results: Comparison of the clinically acceptable cases revealed that there was a stati sti cally signifi cant diff erence (p<0.05%) among the groups and the Root ZX technique was bett er than the radiographic techniques. Root ZX presented sati sfactory results in 69.56% of the cases, while the apical retrograde radiographic technique and the modifi ed Ingle's technique had success rates of 60.87% and 43.48%, respecti vely. Conclusion:The germ of the permanent successor did not infl uence the electronic measurement of the root canal length and the accuracy in measuring the acceptable working length was greater for Root ZX than for the radiographic techniques.Objeti vo: Avaliar a determinação eletrônica do comprimento do canal radicular de molares decíduos com e sem a presença do sucessor permanente e compará-la com duas técnicas radiográfi cas convencionais. Método: Para a realização do presente estudo, foi selecionado 30 molares decíduos. Um total de 46 raízes com menos de 1/3 de reabsorção foram uti lizados. Após o acesso endodônti co, foi feita a medição direta dos canais radiculares com o auxílio de um paquímetro digital e radiografi a. A determinação eletrônica do comprimento do canal consti tuiu-se em duas etapas. Na primeira, realizada com a presença do sucessor permanente, os resultados foram comparados com a radiografi a uti lizada para a técnica de odontometria de Ingle modifi cada. Na segunda etapa, sem a presença do sucessor permanente entre as raízes dos molares decíduos, os resultados foram comparados com o uso da radiografi a realizada pela técnica de odontometria do recuo apical. Os dados foram analisados estati sti camente por meio do teste Qui-Quadrado ao nível de 5% de signifi cância. Resultados: A comparação do número de casos clinicamente aceitáveis mostrou que existi u diferença signifi cati va (p<0,05) entre os grupos, sendo o Root ZX superior às técnicas radiográfi cas. O Root ZX apresentou resultados sati sfatórios em 69,56% dos casos e as técnicas radiográfi cas ...

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