Efeito da aplicação adicional de silano a um sistema adesivo universal sobre a resistência de união entre uma cerâmica reforçada por dissilicato de lítio e uma resina composta

• Ano de defesa: 2016
• Autor(a) principal: Moro, André Fábio Vasconcelos
• Orientador(a): Perez, Cesar dos Reis
• Banca de defesa: Dias, Katia Regina Hostilio Cervantes , Miranda, Mauro Sayão de , Ferreira, Nancy de Assis , Rabello, Tiago Braga , Borges, Márcio Antônio Paraizo
• Tipo de documento: Tese
• 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: Odontologia; Dentística Operatória; Materiais Dentários; Cimentação; Cerâmica; Resistência ao Cisalhamento
• Palavras-chave em Inglês: Dentistry; Dentistry Operative; Dental Materials; Cementation; Ceramics; Shear strength
• Área do conhecimento CNPq: CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA
• Link de acesso: http://www.bdtd.uerj.br/handle/1/14037

The aim of this study was to evaluate, through a microshear bond strength test, the effect of an additional silane application before a universal adhesive system on the interface between a lithium disilicate ceramic system and a flowable resin. Two hundred IPS e.max Press/Ivoclar Vivadent discs (13x3mm) were made, abraded with sandpaper silicon carbide (220-600) and cleaned with 37% phosphoric acid (30s) immediatelly before application of silane agent or adhesive system. On each disc five resin cylinders were built, which summarized one thousand cylinders. The treatment applied to the ceramic surface previous to the resin insertion was performed according to each of these groups: G1: 20s hydrofluoric acid (HF) + silane (S) + Single Bond 2 / 3M ESPE (SB); G2: 20s HF + S + Single Bond Universal / 3M ESPE (U); G3: 20s HF + U; G4: 20s HF + S + Single Bond Universal mixed with Dual Cure Activator / 3M ESPE (OPC); G5: 20s HF + OPC; G6: S + SB; G7: S + U; G8: U; G9: S + OPC; G10: OPC. The groups from G11 to G20received the same surface treatment, but they were submitted to 10.000 thermal cycles. The G1 to G10 were taken to the universal testing machine EMIC for microshear test, while the G11 to G20 were subjected to thermal cycling with alternating baths of 20s at 5°C and 55°C temperature, and then were submitted to the microshear test. The statistical analysis was done with ANOVA with 95% confidence level (p = 0.000) and Tukey s post-hoc test. The results showed that all groups etched with HF had significantly higher bond strength values while thermocycling only caused significant difference between groups of the same surface treatment without prior etching with HF and between G1 and G11 groups. The fracture mode evaluated by optical microscopy, scanning electron microscopy and analysis of chemical elements by EDS demonstrated total of 24.3% of mixed fractures; 74.5% adhesive fractures and 1.2% of cohesive fractures. It can be concluded that the additional prior silane application increased the bond strength between the universal adhesive and ceramics, besides the etching with hydrofluoric acid was determining factor for obtaining higher results, especially after thermal cycling.