Assunção, Isauremi Vieira deRibeiro, Andressa Eveline de Lima2019-12-102019-12-102019-06-26RIBEIRO, Andressa Eveline de Lima. Influência da técnica restauradora e do tempo de envelhecimento na resistência ao cisalhamento por extrusão (push-out), nanoinfiltração e profundidade de polimerização em cavidades profundas. 2019. 46f. Dissertação (Mestrado em Ciências Odontológicas) - Centro de Ciências da Saúde, Universidade Federal do Rio Grande do Norte, Natal, 2019.https://repositorio.ufrn.br/jspui/handle/123456789/28192INTRODUCTION: Restorative techniques make a fundamental role in the clinical longevity of restorations, especially in deep composite resin cavities. OBJECTIVE: The aim of this study was to evaluate the influence of the restorative technique (direct incremental, direct single fill and semi-direct) and aging time (24 hours and 6 months) on extrusion shear strength (push-out), nanoleakage (NK) and depth of polymerization (DP) in cavities deep. METHODS: A total of 120 bovine incisives (n=20) were used to separate the root and the coronary portion, with a cavity preparation of 4.8mm in diameter, 2.8mm in diameter and 4.0mm in depth. . As examples were divided into 6 groups according to the restorative technique and working time: BF 24hs, SD 24hs, CONV 24hs, BF 6 months, SD 6 months and CONV 6 months. The tests performed were depth of polymerization (DP), nanoleakage (NK) and extrusion shear strength (push-out). Data were applied using descriptive and inferential statistics using Two Way ANOVA with Tukey Post Hoc (p <0.005). RESULT: For push-out, there was a statistically significant variation between restorative variables (p <0.005), where the semidirect technique presented better results. Still in this analysis, there was no significant difference without aging time (p> 0.005) for each technique. For DP there was no statistically significant difference between restorative techniques at any time of analysis (p> 0.005). At NK, the semidirect technique did not show concentration of silver crystals at the adhesive interface, thus demonstrating better results than the conventional and single fill technique. CONCLUSION: The semidirect technique, due to its good mechanical behavior and the lower incidence of nanoleakage at the adhesive interface, can be indicated in deep posterior teeth cavities.Acesso AbertoResinas compostasFalha de restauração dentáriaEstresse mecânicomasterThesisCNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA