Efficiency of Er:YAG LASER versus Er;Cr:YSGG LASER in Veneers Debonding with Two Materials & Thicknesses -An in vitro study

Abstract

This in-vitro study was designed to evaluate and compare the efficiency of Er:YAG LASER versus Er;CR:YSGG LASER in veneers debonding using two glass-ceramic materials; Lithium Disilicate (IPS Emax CAD) and Leucite reinforced ceramic (IPS Empress CAD); of two different thicknesses: 0.3mm and 0.7 mm. Eighty-four freshly extracted sound premolars were collected and stored in saline. They were divided into three main groups according to LASER wavelength used (n= 28): Er:YAG of wavelength 2940nm, Er;CR:YSGG of wavelength 2980nm and Control group in which samples received no LASER irradiation. Each group was subdivided into two subgroups according to material used: Subgroup Emax (N=14) and Subgroup Empress (N=14) Each subgroup was further divided into two divisions according to material thickness: Division 0.3mm (N=7) and Division 0.7mm (N=7)