Abstract
The aim of this study is to investigate, by microscopy images and bond strength, the effect of hydrofluoric acid concentrations and previous thermal treatment to the etching procedure on a dental ceramic. Vitreous ceramic blocks of IPS e.max Press (Ivoclar Vivadent, Schaan, Liechtenstein) will be made and randomly assigned in 2 groups for acid concentrations: 5% IPS Etching Gel (Ivoclar V…