EVALUATION OF MICROSHEAR BOND STRENGTH OF GLASS CERAMIC VENEERS BONDED TO FLUOROSED TEETH AFTER ER-YAG LASER ENAMEL PRETREATMENT

Document Type : Original Article

Authors

1 Fixed Prosthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt

2 Conservative department faculty of dentistry Alexandria University

3 Professor of Fixed prosthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt.

Abstract

Background: The bonding materials directly affect the clinical success of esthetic indirect restoration on fluorosed enamel. The literature has thoroughly discussed an innovative surface treatment method that varied from the traditional techniques. Yet there is lack of knowledge regarding the erbium-doped yttrium aluminum garnet (Er-YAG) laser effect on the enamel etching before cementation of glass ceramic veneers on fluorosed teeth.
Objectives: Compare microshear bond strengths (µSBS) of glass ceramic veneers bonded to fluorosed teeth after Er:YAG laser and 37% phosphoric acid enamel etching.
Materials and methods: Thirty-six CAD lithium disilicate ceramic microdiscs with 1-mm height and 1-mm diameter were cemented to two main groups: fluorosed group (test group n = 18) and non-fluorosed group (control group n = 18). Each group was subdivided into two subgroups (n = 9) according to surface modification method: either Er:YAG laser or 37% phosphoric acid. A universal bonding agent and a resin cement were used for microdiscs bonding. After thermocycling, the microdiscs were subjected to (µSBS) tests at a crosshead speed of 0.5 mm/min until failure. The Kruskal-Wallis test was performed to compare (µSBS) between groups.
Results: There was no significant difference in microshear bond strength mean values between groups treated with the Er:YAG laser or 37% phosphoric acid.
Conclusions: The glass ceramic veneers cemented on laser modified fluorosed enamel surface by Er:YAG show higher mean µSBS values than 37% phosphoric acid.

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Alexandria Dental Journal
Volume 50, Issue 2
B (Endodontics, Prosthodontics, Fixed prosthodontics, Conservative dentistry, Dental Biomaterials)
August 2025
Pages 129-135

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