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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Oyaguee, Raquel C. [1] ; Osorio, Raquel [2] ; da Silveira, Bruno Lopes [3] ; Toledano, Manuel [2]
Total Authors: 4
[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
Total Affiliations: 3
Document type: Journal article
Source: Photomedicine and Laser Surgery; v. 29, n. 7, p. 465-475, JUL 2011.
Web of Science Citations: 4

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)

FAPESP's process: 05/01918-5 - Influence of surface treatment with different lasers on aluminous ceramic adhesive lutting stability: comparative study between micro-tensile and micro-shear bond strength
Grantee:Bruno Lopes da Silveira
Support Opportunities: Scholarships in Brazil - Doctorate