Influência do tratamento da dentina com hipoclorito de cálcio sobre a infiltração marginal de restaurações de resina composta

• Autor(a) principal: Ferreira, Michele Bortoluzzi de Conto
• Data de Publicação: 2013
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca de teses e dissertações da Universidade de Passo Fundo (BDTD UPF)
• Texto Completo: http://10.0.217.128:8080/jspui/handle/tede/826
• topic: Restauração (Odontologia); Dentina; Resinas compostas; Restoration ( Dentistry); Dentin; Composites; CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA

The use calcium hypochlorite (CaOCl) has been proposed for dentin deproteinization before applying adhesive system by microtensile testing. This study aimed to evaluate microleakage (ML) of Class V composite resin restorations after treating the dentin with different concentrations of CaOCl. The following hypotheses were analyzed: deproteinization (DP) with CaOCl, as well as its concentration does not influence ML values. Intact human third molars received two cavities at the lingual/palatal and buccal aspects measuring 2.0 mm in high x 3.0 mm in width x 2.0 mm in depth and were randomly divided into 5 groups of 20 cavities each, according to the dentin treatment (n = 20): G1 (control 1) - no dentin treatment; G2 (control 2) - 10% NaOCl for 30 s; G3 - 10% CaOCl for 30 s; G4 - 15% CaOCl for 30 s; G5 - 20% CaOCl for 30 sec. The cavities were restored with an acetone based adhesive system and a light cured composite resin. The samples were subjected to 5000 cycles of thermal cycling at 5 and 55 C, sealed with nail varnish, immersed in the methylene blue dye for 4 h and sectioned in the middle of the restoration to produce two plates with 1 mm in thickness and four surfaces for evaluation. Two examiners evaluated the samples using a stereomicroscope at 20X magnification and attributed scores since 0 to 3 depending on the degree of infiltration. ML data were evaluated by Kruskal-Wallis test at 5% significance level which showed no statistically significant difference between the experimental groups (p = 0.68). It was concluded that 10, 15 or 20% of CaOCl lead to ML levels similar to DP technique with 10% NaOCl or conventional hybridization which is in agreement with the hypotheses of this study