Evaluation of the Microtensile Bond Strength between Resin Composite and Hydrofluoric Acid Etched Ceramic in Different Storage Media

The aim of this study was to evaluate the effects of storage media on the bond strength between resin composite and ceramic that was etched with hydrofluoric acid and silanized. Two types of ceramics were used: lithium disilicate and leucite-reinforced. The ceramic surface was etched with 4.7% hydrofluoric acid and bonded to the resin composite using a silane coupling agent. Specimens were divided into 10 groups and each group of specimen was subjected to different types of storage conditions for 7 days: de-ionized water (control), 15% ethanol, lemon soda, and cola. The microtensile test was used to measure the bond strength. The results showed that storage in food beverages significantly reduced bond strength compared to controls because of the acidity of beverages (ANOVA; p < 0.05). Lithium disilicate ceramics stored for 7 days in ethanol produced bond strengths significantly lower than those stored in 7 days in de-ionized water (p < 0.05). Leucite-reinforced ceramics stored for 7 days in lemon soda generated mean bond strengths significantly lower than those stored for 7 days in de-ionized water (p < 0.05). The significance of this in vitro study is that patients who have just repaired fractured crowns or inserted laminates should refrain from drinking acidic substances because it may weaken the resin-to-ceramic bond. (C) Koninklijke Brill NV, Leiden, 2011