Efeito do selamento dentinário imediato na resistência de união de restaurações cerâmicas

• Ano de defesa: 2009
• Autor(a) principal: Macêdo, Mariana de Andrade
• Orientador(a): Sampaio Filho, Hélio Rodrigues
• Banca de defesa: Monnerat, Antonio Fernando , Vasconcellos, Beatriz Tholt de , Miranda, Mauro Sayão de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade do Estado do Rio de Janeiro
• Programa de Pós-Graduação: Programa de Pós-Graduação em Odontologia
• Departamento: Centro Biomédico::Faculdade de Odontologia
• País: BR
• Palavras-chave em Português: Cerâmica odontológica; Adesivos dentinários; Impermeabilização dentinária; Cimentos de resina; Cerâmicas
• Palavras-chave em Inglês: Dentin-bonding agents; Resin cements; Ceramics
• Área do conhecimento CNPq: CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA
• Link de acesso: http://www.bdtd.uerj.br/handle/1/14106

The aim of this study was to evaluate the effect of immediate dentin sealing on bond strength of ceramic restorations, taking into account the influence of different techniques used to remove temporary cement remainings from dentin surfaces. Seventy two intacts and caries free human molars were taken from UERJ teeth bank in order to perform the necessary experiments. They were divided into nine groups. The first three groups served as control groups and there was no contamination with temporary cements: G1, the dentin sealing and ceramic cementation were made fifteen days after preparation; G2, the dentin was sealed immediately after preparation and after fifteen days the ceramic restorations were fixed; G3, wich the praparation, dentin sealing and ceramic cementation were made at the same time. The next three groups constituted the delayed dentin sealing group, where the dentin bonding agent were applied only in the moment of ceramic cementation. After preparation, provisional restorations were placed with a provisional cement without eugenol (Temp Bond®NE) and after fifteen days they were removed and dentin surfaces were cleaned by differents methods: G4: hand instrument; G5: sodium bicarbonate jet; G6: ultra-sonic scaler. The adhesive system was then applied and the ceramics were bonded. The three last groups constituted the immediate dentin sealing, where the dentin bonding agent was applied immediately after preparation, before provisional cementation. Following fifteen days, the provisional restorations were removed and the sealed dentin were cleaned by differents methods: G7: hand instrument; G8: sodium bicarbonate jet; G9: ultra-sonic scaler. After these procedures the ceramic restorations were bonded. The adhesive system used in all groups was Optibond® Kerr and the resin cement was Rely X ARC®3M/ESPE. Following twenty four hours all specimens were submitted to the push-out test in a universal testing machine EMIC DL®. The push out bond strength was obtained in KgF and were then converted into MPa. The results were analysed: one-way ANOVA revealed significant differences between groups (p≤0,05), t-test showed that immediate dentin sealing provided the highest values of bond strength. At least, the Multiple comparisions SNK Test detected that the differents techniques used to remove temporary cement remainings from dentin surfaces had an influence on the ceramic bond strength, and even when immediate dentin sealing or delayed dentin sealing was used, the ultra-sonic scaler showed the better results.