Evaluation of Shear Bond Strength of E.Max Veneers Bond to Enamel Tooth Structure (An in Vitro Study)

Abstract

Objectives: Patient demand for aesthetic dentistry is growing, Which lead to ceramic veneers using in dentistry has been increased. Aims:the aim of this study is to evaluat the shear bond strength of empress E.max veneer to enamel tooth structure using different light intensity.mehods: Ten maxillary and mandibular extracted premolar for orthodontic purpose was used.20 E.max empress disc were prepared according to manfacture instruction then the discs randomly dived into 2 groups .the cement used to cementind the disc to enamel tooth surface was bisco choice2 translucent light cured resin cement.The groups dived into A group and B group, Group A: low light intensity group in which Standard power has at 1000mW / cm² (10 Sec) applied for each disc bonded to enamel tooth surface. Group B: high  light intensity group which is high power intensity  at 1400 mW/cm² (4 Sec) for each disc bonded to enamel tooth surface to complet set. Results: Statistically high significant difference (<0.001) between group A and B in which the means for low intensity groups is 14.05±1.417 Mpa while the high intensity light groups mean 23.79±1.693. Conclusions: According to this study the use of high power intensity curing unit with veneer thickness 1mm give better bond strength of veneer to the tooth than when usind low power intensity curing unit with same veneer thickness.

Keywords: e.max,veneer,light intensity,shear bond.