Related Experiment Videos
Selective ablation of orthodontic composite by using sub-microsecond IR laser pulses with optical feedback
1Department of Growth and Development, University of California, San Francisco, California 94143, USA.
Lasers in Surgery and Medicine
|August 29, 2000
Summary
Infrared pulsed lasers offer a novel method for removing residual composite after orthodontic bracket debonding. Specifically, TEA CO2 lasers show potential for selective composite ablation, minimizing enamel damage.
Area of Science:
- Biomedical Engineering
- Dental Materials Science
- Laser Physics
Background:
- Conventional methods for removing residual composite after orthodontic debonding often damage enamel.
- Abrasive techniques pose a risk of iatrogenic damage to the tooth surface.
Purpose of the Study:
- To evaluate the efficacy of infrared pulsed lasers for selective composite ablation.
- To determine if lasers can remove composite without harming underlying enamel.
Main Methods:
- Pulsed Carbon Dioxide (CO2) and Erbium, Yttrium, Aluminum, Garnet (Er:YAG) lasers were tested for selective composite ablation.
- Optical emission spectra of plasma generated during ablation were analyzed to differentiate between composite and enamel removal.
Main Results:
- Transversely Excited Atmospheric (TEA) CO2 laser pulses at 10.6 micrometers demonstrated optimal selective ablation of composite material.
- Spectral analysis revealed specific calcium emission lines indicative of enamel ablation, enabling differentiation.
Conclusions:
- TEA CO2 lasers operating at 10.6 micrometers, coupled with optical feedback, show significant potential for selectively ablating residual dental composite.
- This laser-based approach can minimize inadvertent enamel removal during post-orthodontic treatment cleaning.