Shear bond strength of ceramic brackets bonded to glazed lithium disilicate using different bonding protocols | ||
| Egyptian Orthodontic Journal | ||
| Article 2, Volume 60, Issue 1, December 2021, Pages 10-20 PDF (292.38 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/eos.2021.79240.1018 | ||
| Authors | ||
| Aly Y. Aboushady* 1; Abbas R. Zaher2; Essam M. Abdullah3 | ||
| 1Department of orthodontics, Faculty of dentistry Alexandria university | ||
| 2Orthodontic depatment, Alexandria University | ||
| 3Department 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 | ||
| Lithium Disilicate; Ceramic Brackets; Air Abrasion; Shear Bond Strength; 10-methacryloylxydecyl dihydrogen phosphate | ||
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