Shear bond strength of ceramic brackets bonded to glazed lithium disilicate using different bonding protocols

Document Type : Original Article

Authors

1 Department of orthodontics, Faculty of dentistry Alexandria university

2 Orthodontic depatment, Alexandria University

3 Department of Orthodontics, Faculty of Dentistry, Alexandria University, Egypt

Abstract

Objectives: To evaluate the shear bond strength (SBS) of ceramic brackets to lithium disilicate using different bonding protocols.
Materials and methods: Forty five lithium disilicate discs were embedded into acrylic resin. and randomly assigned to three equal groups (n=15), according to bonding protocol into: (A)Air abrasion with 50μm aluminum oxide particles + Assure Plus, (B) air abrasion with 50μm aluminum oxide particles + silane + Assure Plus (C) air abrasion with 50μm aluminum oxide particles + hydrofluoric acid etching + silane + Transbond XT Primer. Ceramic brackets were then bonded to the lithium disilicate discs using light cure-composite resin. Following thermocycling (500 cycles, 5° - 55° C), shear bond strength(SBS) testing was performed with a universal testing machine. After bracket debonding Failure mode and Adhesive Remnant Index were assessed under a stereomicroscope.
Results: No significant differences were found among the three groups regarding SBS, Group B showed the highest SBS values. Most specimens in Group B and Group C showed a failure at the bracket adhesive interface. Specimens in Group A showed a mixed cohesive-adhesive failure pattern
Conclusion: All 3 groups exhibited shear bond strengths within the clinically acceptable level, samples recieving Air abrasion + Assure plus only displayed better debonding characteristic.

Keywords

Egyptian Orthodontic Journal
Volume 60, Issue 1
December 2021
Pages 10-20

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