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Future Dental Journal of Egypt

Abstract

Purpose: To assess the effect of aging and various surface treatments on the microtensile bond strength of resin cement to two hybrid esthetic materials. Materials and Methods: Zirconia-reinforced lithium silicate (Celtra Duo, Dentsply Sirona, United States) and hybrid resin nanoceramic (Cerasmart TM, GC Corporation, Japan) blocks were cut into plates of 3 mm thickness. Each ceramic material was surface treated either with hydrofluoric acid etching and silane or with sandblasting and silane. A dual-cured adhesive resin cement (Panavia TM V5, Kuraray, U.S.A.) was utilized to bond the composite resin plates to the surface treated ceramic plates. The ceramic-composite resin blocks were then stored for 24 hours in distilled water. Each block was cut into microbeams and 20 specimens from each subgroup were tested directly after storage while the other half after 5000 thermocycles. Microtensile bond strength test was performed until bonding failure. Three-way ANOVA and Bonferroni’s post-hoc test were applied to analyze the data (P ≤ 0.05). Results: Both ceramics showed a statistically significant decrease in bond strength after aging. Before aging, zirconia-reinforced lithium silicate showed no statistically significant difference in microtensile bond strength between the two surface treatments. After aging, hydrofluoric acid etching showed higher statistically significant microtensile bond strength than sandblasting. With hybrid resin nanoceramic, hydrofluoric acid etching showed higher statistically significant microtensile bond strength than sandblasting before and after aging. Conclusion: For both hybrid ceramic materials, aging had a detrimental effect on the bond strength. Moreover, hydrofluoric acid etching as a surface treatment yielded higher microtensile bond strength than sandblasting.

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