Shear bond strength of resin cement bonded to alumina ceramic after treatment by aluminum oxide sandblasting or silica coating.

摘要

PURPOSE: To evaluate the shear bond strength and bond durability between a dual-cured resin cement (RC) and a high alumina ceramic (In-Ceram Alumina), subjected to two surface treatments. MATERIALS AND METHODS: Forty disc-shaped specimens (sp) (4-mm diameter, 5-mm thick) were fabricated from In-Ceram Alumina and divided into two groups (n = 20) in accordance with surface treatment: (1) sandblasting by aluminum oxide particles (50 mum Al(2) O(3) ) (SB) and (2) silica coating (30 mum SiO(x) ) using the CoJet system (SC). After the 40 sp were bonded to the dual-cured RC, they were stored in distilled water at 37 degrees C for 24 hours. After this period, the sp from each group were divided into two conditions of storage (n = 10): (a) 24 h-shear bond test 24 hours after cementation; (b) Aging-thermocycling (TC) (12,000 times, 5 to 55 degrees C) and water storage (150 days). The shear test was performed in a universal test machine (1 mm/min). RESULTS: ANOVA and Tukey (5%) tests noted no statistically significant difference in the bond strength values between the two surface treatments (p = 0.7897). The bond strengths (MPa) for both surface treatments reduced significantly after aging (SB-24: 8.2 +/- 4.6; SB-Aging: 3.7 +/- 2.5; SC-24: 8.6 +/- 2.2; SC-Aging: 3.5 +/- 3.1). CONCLUSION: Surface conditioning using airborne particle abrasion with either 50 mum alumina or 30 mum silica particles exhibited similar bond strength values and decreased after long-term TC and water storage for both methods.