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.

No abstract

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.