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Proceedings Paper

Histologic comparison of the CO2 laser and Nd:YAG with and without water/air surface cooling on tooth root structure
Author(s): Charles M. Cobb; Paulette Spencer; Mark H. McCollum
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Paper Abstract

Specimens consisted of 18 extracted single rooted teeth unaffected by periodontal disease. After debriding roots, specimens were randomly divided into 4 treatment groups and subjected to a single pass, at varying energy densities, of a CO2, Nd:YAG, and Nd:YAG with air/water surface cooling (Nd:YAG-C). The rate of exposure was controlled at 4 mm/sec. Approximate energy densities were: CO2, 138, 206, 275, and 344 J/cm2; Nd:YAG, 114, 171, 229, and 286 J/cm2; Nd:YAG-C, 286, 343, 514, and 571 J/cm2. The CO2 laser was used both in continuous and pulsed beam modes (20 Hz, 0.01 sec pulse length and 0.8 mm dia spot size) whereas the Nd:YAG and Nd:YAG-C were preset at 50 Hz, 0.08 sec pulse length and 0.6 mm dia spot size. Specimen examination by SEM revealed, for all lasers, a direct correlation between increasing energy densities and depth of tissue ablation and width of tissue damage. However, to achieve the same relative dept of tissue ablation, the Nd:YAG-C required higher energy densities than either the CO2 or Nd:YAG lasers. The Nd:YAG-C generated a cavitation with sharply defined margins. Furthermore, regardless of energy density, and in contrast with other laser types, areas treated with the Nd:YAG-C did not exhibit collateral zones of heat damaged surface tissue.

Paper Details

Date Published: 1 May 1995
PDF: 12 pages
Proc. SPIE 2394, Lasers in Dentistry, (1 May 1995); doi: 10.1117/12.207453
Show Author Affiliations
Charles M. Cobb, Univ. of Missouri/Kansas City School of Dentistry (United States)
Paulette Spencer, Univ. of Missouri/Kansas City School of Dentistry (United States)
Mark H. McCollum, Univ. of Missouri/Kansas City School of Dentistry (United States)


Published in SPIE Proceedings Vol. 2394:
Lasers in Dentistry
Harvey A. Wigdor; John D. B. Featherstone; Joel M. White, Editor(s)

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