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In vitro comparison of debonding force and intrapulpal temperature changes during ceramic orthodontic bracket removal
1Department of Mechanical Engineering, University of Pittsburgh, PA 15261, USA.
Summary
This study shows that using a carbon dioxide laser can reduce the force needed to debond ceramic orthodontic brackets. This laser method keeps the tooth pulp temperature safe, preventing damage during bracket removal.
Area of Science:
- Biomaterials Science
- Dental Materials
- Orthodontics
Background:
- Ceramic orthodontic brackets can fracture during debonding.
- Lasers can soften bonding resin to reduce debonding force.
- Pulp damage is a concern due to laser heat; a 2°C rise is considered safe.
Purpose of the Study:
- To develop a laser-assisted method for ceramic bracket debonding.
- To investigate the effect of lasing time on intrapulpal temperature and debonding force.
- To ensure intrapulpal temperature rise remains below the threshold for pulpal damage.
Main Methods:
- A carbon dioxide laser (18 W) was used on ceramic brackets bonded to teeth.
- Thermocouples monitored intrapulpal temperature rise.
- Tensile debonding forces were measured for laser-treated and control groups.
Main Results:
- A significant reduction in tensile debonding force was observed in the laser-treated group (P < 0.05).
- Lasing time was determined to maintain intrapulpal temperature rise below 2°C.
- The laser method proved feasible for ceramic bracket debonding.
Conclusions:
- Laser-assisted debonding of ceramic orthodontic brackets is feasible.
- This technique reduces required debonding forces while maintaining pulpal safety.
- Further research can optimize laser parameters for clinical application.