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Optimization of a procedure for rebonding dislodged orthodontic brackets
B Mui1, P E Rossouw, G V Kulkarni
1Department of Orthodontics, University of Toronto, Canada.
The Angle Orthodontist
|June 17, 1999
Summary
Rebonding orthodontic brackets requires careful enamel preparation. Using a tungsten carbide bur and acid-etching provides the highest shear bond strength for rebonded brackets, ensuring optimal clinical outcomes.
Area of Science:
- Orthodontics
- Biomaterials Science
- Dental Adhesion
Background:
- Orthodontic bracket debonding is a common clinical occurrence.
- Effective rebonding protocols are crucial for treatment efficiency and patient comfort.
- Residual adhesive removal and enamel reconditioning significantly impact bond strength.
Purpose of the Study:
- To compare the shear bond strength (SBS) of rebonded orthodontic brackets.
- To evaluate various resin removal and enamel conditioning methods.
- To assess the influence of light-cured versus self-cured composite resins on bond strength.
Main Methods:
- Five distinct methods for residual resin removal and enamel reconditioning were tested.
- Brackets were debonded, treated, and rebonded using either light-cured or self-cured composite resins.
- Shear bond strength was measured, and fracture characteristics were analyzed.
Main Results:
- Light-cured composite resins yielded higher initial bond strength than self-cured systems.
- Reconditioning enamel with a tungsten carbide bur and acid-etching resulted in the highest SBS.
- This method also demonstrated clinically favorable fracture characteristics.
Conclusions:
- The optimal rebonding procedure involves resurfacing enamel with a tungsten carbide bur and acid-etching.
- Microetching old brackets allows for successful reuse.
- This approach ensures robust bond strength and favorable clinical outcomes for rebonded orthodontic brackets.