Comparison of Bond Stability Between Dual-Cure Resin Cements and Pretreated Glass-Infiltrated Alumina Ceramics

Autor(es)

Oyaguee, Raquel C. ^[1] ; Osorio, Raquel ^[2] ; da Silveira, Bruno Lopes ^[3] ; Toledano, Manuel ^[2]

Afiliação do(s) autor(es)

^[1] UCM, Sch Dent, Dept Prosthodont, Madrid - Spain

^[2] Univ Granada UGR, Sch Dent, Dept Dent Mat, Granada - Spain

^[3] Univ Fed Santa Maria, Sch Dent, Dept Restorat Dent, BR-97119900 Santa Maria, RS - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Photomedicine and Laser Surgery; v. 29, n. 7, p. 465-475, JUL 2011.
• Citações Web of Science: 4

Resumo

Objectives: To evaluate the bond stability of resin cements used for luting alumina-based all-ceramic dental restorations. Background data: Although different pretreatments may be applied on alumina to improve bond strengths, any previous study investigated the bond stability of resin-based cements luted to laser-irradiated alumina. Methods: 64 sintered, glass-infiltrated alumina blocks were sandblasted and randomly assigned to the following subgroups: 1. no additional treatment (NT); 2. Rocatec (Roc); 3. Nd:YAG laser (L); and 4. Nd: YAG laser plus Rocatec (LRoc). Composite samples were bonded to conditioned ceramics using two different resin based cements: a self-etching adhesive cement-Panavia F (PF) and a self-adhesive resin cement-RelyX Unicem (RXU). After 24 h, bonded specimens were cut into microtensile sticks (1 +/- 0.1 mm(2)). One-half of the beams were loaded in tension until failure. The remaining one-half was immersed in 10%-NaOCl aqueous solution (NaOCl(aq)) for 12 h before testing. ANOVA and Student-Newman-Keuls tests were run (P < 0.05). Failure mode was recorded. Ceramic topography was SEM-analyzed. Results: After 24 h, L-sticks achieved the highest MTBS despite the cement type, whereas NT-samples recorded the lowest values. After NaOClaq immersion bond strengths decreased except for RXU luted to NT-alumina. PF luted to L-and LRoc-samples, and RXU luted to L-sticks attained the highest bond strength. Conclusions: Nd: YAG laser irradiation improved bond strength between alumina ceramics and resin cements (PF or RXU). Chemical challenging impaired adhesion, mainly through resin matrixes and silane coupling degradation. Laser-treated specimens remained with the highest bond strength. (AU)

• Processo FAPESP: 05/01918-5 - Influência dos tratamentos de superfície com diferentes lasers na estabilidade da cimentação adesiva de uma cerâmica aluminizada: estudo comparativo entre ensaio de microtração e microcisalhamento
• Beneficiário: Bruno Lopes da Silveira
• Modalidade de apoio: Bolsas no Brasil - Doutorado