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Proceedings Paper

Effect of energy (J) on temperature changes at apical root surface when using Er:YAG laser to enlarge root canals
Author(s): Jesus Djalma Pecora D.D.S.; Aldo Brugnera Jr.; Fatima A. A. Zanin D.D.S.; Melissa A. Marchesan; Naser A. Daghastanli; Reginaldo S. Silva
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Paper Abstract

The use of lasers for cleaning, shaping and disinfecting root canals must not produce heat which damages periapical tissue and alveolar bone. The aim of the present study was to determine the increase of external temperature at the apical surface of the root canal after Er:YAG laser irradiation with a 250 micrometer diameter fiberoptic guide with and without distilled and deionized water at 3 different total energies. Thirty single-rooted teeth were instrumented to #25 K-file using distilled and deionized water for irrigation. They were divided into three groups according to total energy (15J, 30J and 45J with 15 Hz and 140 mJ per pulse). Each group was irradiated with water and then without water. The increase in temperature at the apical root surface was measured with a multimeter and a thermocouple. Changes in apical temperature were significantly different in all groups (p less than 0.01; 15 J less than 45 J less than 30 J). Less time was necessary for return to initial room temperature at 15 J. We conclude that in vitro use of the Er:YAG laser (total energy of 15, 30, and 45 J) increased external apical root temperature and that the root canal must be filled with distilled and deionized water to reduce the risk of an increase in temperature.

Paper Details

Date Published: 24 March 2000
PDF: 5 pages
Proc. SPIE 3910, Lasers in Dentistry VI, (24 March 2000); doi: 10.1117/12.380812
Show Author Affiliations
Jesus Djalma Pecora D.D.S., Univ. de Sao Paulo (Brazil)
Aldo Brugnera Jr., Univ. Camilo Castelo Branco and Univ. Federal do Rio de Janeiro (Brazil)
Fatima A. A. Zanin D.D.S., Univ. Camilo Castelo Branco (Brazil)
Melissa A. Marchesan, Univ. de Sao Paulo (Brazil)
Naser A. Daghastanli, Univ. de Sao Paulo (Brazil)
Reginaldo S. Silva, Univ. de Sao Paulo (Brazil)

Published in SPIE Proceedings Vol. 3910:
Lasers in Dentistry VI
John D. B. Featherstone; Peter Rechmann D.D.S.; Daniel Fried, Editor(s)

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