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Thermal debracketing of single crystal sapphire brackets
1Dental Physical Sciences, School of Dentistry, Medical College of Georgia, Augusta 30912-1264.
The Angle Orthodontist
|January 1, 1992
Summary
Sapphire brackets offer esthetic advantages but can damage enamel during removal. This study found varying thermal debonding temperatures for different orthodontic resins, aiding clinicians in selecting materials to protect teeth.
Area of Science:
- Orthodontic Materials Science
- Dental Biomaterials
- Adhesive Dentistry
Background:
- Single crystal sapphire brackets offer superior esthetics in orthodontics.
- Debonding sapphire brackets can cause iatrogenic enamel damage.
- Thermal debonding is a proposed method to mitigate this damage.
Purpose of the Study:
- To determine the enamel/resin interface temperature required for thermal debonding of sapphire brackets.
- To evaluate 23 commercial and one experimental orthodontic resin for thermal debonding characteristics.
- To provide data for selecting resins that minimize thermal damage during sapphire bracket removal.
Main Methods:
- Sapphire brackets were bonded to etched bovine enamel using various orthodontic resins.
- The temperature at the enamel/resin interface needed for bracket debonding was measured.
- Different resin types (powder-liquid, two-paste, no-mix, light-cured) were tested.
Main Results:
- A significant variation in thermal debonding temperatures was observed across the tested resins.
- Powder-liquid resins exhibited a statistically lower debonding temperature compared to other resin types.
- Two-paste, no-mix, and light-cured resins showed similar debonding temperatures.
Conclusions:
- The choice of orthodontic resin significantly impacts the thermal debonding temperature of sapphire brackets.
- Clinicians can utilize this information to select resins that facilitate safer thermal debonding.
- Minimizing thermal damage to enamel during sapphire bracket removal is achievable through informed resin selection.