Influence of silane and heated silane on the bond strength of lithium disilicate ceramics - An in vitro study

Objectives: to evaluate the effect of silane application and silane heat treatment on lithium-disilicate ceramic when bonded to composite resin. methods: twelve blocks of lithium-disilicate (ld) ceramic were fabricated and bonding surfaces were etched using 9.5% hydrofluoric acid (90 seconds). three experimental groups resulted from the various surface treatment combinations,which included,no silane application (ns) (controls),silane application (s) and silane heat treatment (hs) (100°c for 5 minutesutes). ceramic and composite resin blocks were bonded using an adhesive resin and light cured restorative composite as a luting agent,under standard conditions. a total of 90 specimen sticks (8 × 1mm2) were subjected to micro-tensile bond strength testing. the means of micro-tensile bond strength (μ-tbs) of the study groups were analyzed using t-test and anova. the tested specimens were analyzed for mode of failure using scanning electron microscopy (sem). results: the highest μ-tbs value (42.6±3.70 mpa) was achieved for ld ceramics with heat-dried silane. both silane application and heat treatment of silane resulted in significant (p<0.05) improvements in microtensile bond strength of ld ceramics when bonded to resin composite. conclusions: the application of silane and its heat treatment showed significant improvement in bond strength of lithium disilicate ceramic when bonded to composite. © 2016,professional medical publications. all rights reserved.