Avaliação in vitro da resistência às forças de cisalhamento de um sistema adesivo de frasco único aplicado sobre dentina após quatro tratamentos diferentes

• Autor(a) principal: Souza, Alexandre Novis de
• Data de Publicação: 1998
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/14230
• topic: Dentin surface treatment; Adhesive system; Smear layer; Sistemas adesivos; Tratamento da dentina; Lama dentinária; CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA

The aim of this study was to compare the shear bond strength of a monocomponent adhesive applied to dentin treated with four diferent ways and to compare the fractured test specimes. The samples were prepared through lingual and bucal faces of human third molars recently extracted and cleaned. After the included of 132 samples, the dentin surfaces were exposed and polished with emery paper, with 220 to 600 girt, in a refrigerated water polisher. The samples were diveded in four groups: (G1) The smear layer was maintained. (G2) Was etched with 37% phosphoric acid by 15 seconds. (G3) Was air abrasioned with sodium hydrolized carbonate under 60 Psi pressure, during 1 minute. (G4) Was air abrasioned with sodium hydrolized carbonate under 30 Psi pressure, during 1 minute. After cleansing and drying of dentin surfaces, a monocomponent adhesive (Prime&Bond 2.1; Dentsply) was applied, using manufactors recommendations. Them, composite cylinders(TPH spestrum- Dentsply) were made using teflon matrix with 3 mm diameter and 5mm of height. The specimens were kept in deionized water for 24 hours at 370C. The test was executed in na Universal Testing Machine EMIC, model DL 10000 with a force cell of 50 Kg and cross-head speed of 0,5mm/min until bond failure occurred.. ANOVA analysis of variance models were used to compare the shear bond strength test results and have no statistically significantly difference between the groups. The fracture pattern was study too, using scores 0 to 3. Was used a Kruskall Wallis test to compare the dates , the results too showed that no statiscally significantly diference between the groups studied