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Proceedings Paper

In vivo spectral guided removal of composite from tooth surfaces with a CO2 laser
Author(s): Jacob C. Simon; Jye Hye Choi; Andrew Jang; Daniel Fried
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Paper Abstract

Dental composites are used as restorative materials to replace tooth structure after the removal of caries, shaping, covering teeth for esthetic purposes and as adhesives. Dentists spend more time replacing existing restorations that fail than they do placing new restorations. Tooth colored restorations are difficult to differentiate from the surrounding tooth structure making them challenging to remove completely without incidental removal of healthy tooth structure. Previous studies have demonstrated that CO2 lasers in conjunction with spectral feedback can be used to selectively remove composite from tooth surfaces. In addition, we assembled a system feasible for clinical use that incorporates a spectral feedback system, scanning system, articulating arm and a clinical handpiece and subsequently evaluated the performance of that system on extracted teeth. The purpose of this study was to test this system in vivo to demonstrate its efficacy relative to dental clinicians. Eight test subjects with premolar teeth scheduled for extraction for orthodontic reasons had bilateral premolars prepared with small occlusal cavity preparations and filled with dental composite. The laser scanning system was used to remove the composite from one of the preparations and a dental handpiece was used to remove the composite from the other. Cross polarization optical coherence tomography was used to measure the volume of the preparation before and after composite placement and removal. There was no significant difference in the loss of enamel and residual composite between the laser and the handpiece. This study demonstrated that a computer controlled spectral guided CO2 laser scanning system can be used in vivo to selectively remove composite from tooth surfaces.

Paper Details

Date Published: 19 February 2020
PDF: 6 pages
Proc. SPIE 11217, Lasers in Dentistry XXVI, 112170K (19 February 2020);
Show Author Affiliations
Jacob C. Simon, Univ. of California, San Francisco (United States)
Jye Hye Choi, Univ. of California, San Francisco (United States)
Andrew Jang, Univ. of California, San Francisco (United States)
Daniel Fried, Univ. of California, San Francisco (United States)

Published in SPIE Proceedings Vol. 11217:
Lasers in Dentistry XXVI
Peter Rechmann; Daniel Fried, Editor(s)

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