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Proceedings Paper

Inhibition of caries in vital teeth by CO2 laser treatment
Author(s): Peter Rechmann D.D.S.; Daniel Fried; Charles Q. Le; Gerald Nelson; Marcia Rapozo-Hilo; Beate M. T. Rechmann; John D. B. Featherstone
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Paper Abstract

In multiple well-controlled laboratory studies enhancing caries resistance of enamel has been successfully reported using short-pulsed 9.6 µm CO2 laser irradiation. The aim of this study was to prove in a short term clinical pilot trial that the use of the CO2 laser will significantly inhibit the formation of carious lesions around orthodontic brackets in vivo in comparison to a non-irradiated control area. Twelve subjects scheduled for extraction of premolars for orthodontic treatment reasons with an average age of 14.6 years were recruited for the 4-week study. Orthodontic brackets were placed on those premolars with a conventional composite resin (Transbond XT, 3M Unitek, REF 712-035) and a defined area next to the bracket was irradiated with a CO2 laser, Pulse System, Inc (PSI) (Model #LPS-500, Los Alamos, New Mexico), wavelength 9.6 &mgr;m, pulse duration 20 &mgr;s, pulse repetition rate 20 Hz, beam diameter 1,100 &mgr;m, average fluence 4.31 +/- 0.11 J/cm2, 20 laser pulses per spot. Premolars were extracted after four weeks for a quantitative assessment of demineralization by cross sectional microhardness testing. The relative mineral loss &Dgr;Z (vol% x µm) for the laser treated enamel was 402 +/- 85 (SE) while the control area showed a significantly higher mineral loss (mean &Dgr;Z 738 +/- 131; P=0.04, unpaired t-test). The laser treatment produced a 46% demineralization inhibition around the orthodontic brackets in comparison to the non-laser treated areas. This study showed, for the first time that a pulsed 9.6 µm CO2 laser works for the prevention of dental caries in the enamel in vital teeth in human mouths.

Paper Details

Date Published: 11 February 2008
PDF: 7 pages
Proc. SPIE 6843, Lasers in Dentistry XIV, 684307 (11 February 2008); doi: 10.1117/12.778797
Show Author Affiliations
Peter Rechmann D.D.S., Univ. of California/San Francisco (United States)
Daniel Fried, Univ. of California/San Francisco (United States)
Charles Q. Le, Univ. of California/San Francisco (United States)
Gerald Nelson, Univ. of California/San Francisco (United States)
Marcia Rapozo-Hilo, Univ. of California/San Francisco (United States)
Beate M. T. Rechmann, Univ. of California/San Francisco (United States)
John D. B. Featherstone, Univ. of California/San Francisco (United States)

Published in SPIE Proceedings Vol. 6843:
Lasers in Dentistry XIV
Peter Rechmann; Daniel Fried, Editor(s)

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