Effect of etching time and light sources on the shear bond strength of metal brackets to ceramic cylinders

Abstract

ObjectiveTo evaluate the shear bond strength of brackets bonded to ceramic with Transbond XT resin, etching time intervals (1 and 2 minutes) and three Light sources (Xenon Plasma Arc, LED and Halogen Light ), with and without silane. Methods In total, 12 feldspathic ceramic cylinders (15 mm x 20 mm), etched with 10% hydrofluoric acid were used. For light activation, the brackets were divided according to the light source to be used (n-15): LED UltraLume 5 (L); Apollo 95E plasma arc (AP) and Halogen light XL 2500 (H).After 24 h the samples were submitted to shear bond strength testing at crosshead speed of 0.5 mm/minute.