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Proceedings Paper

Temperature changes in the pulp chamber during dentin ablation with Er:YAG laser
Author(s): Xianzeng Zhang; Haibin Zhao; Zhenlin Zhan; Wenqing Guo; Shusen Xie
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Paper Abstract

To examine the temperature changes in the pulp chamber during cavity preparation in dentin with the Er:YAG laser (2940 nm), a total 20 intact premolars teeth were divided into 4 groups for dentin ablation with different radiant exposures at 4Hz and 8Hz with and without water spray. A K-type thermocouple was used to monitor the temperature changes in pulp chamber during laser treatment. The total time of irradiation was 70 sec. the water spray rate was 3 mL/min. It showed that maximum temperature rise increases with the increasing of radiant exposure and pulse repetition rate and the additional water cooling during laser ablation can significantly reduce the temperature rise in pulp chamber which will benefit to avoid or reduce thermal damage to tooth structure and dental pulp. The highest rise of temperature in the pulp was achieved with 20 J/cm2 and 8 Hz (19.83°C ). For all sample without water spray, the rise of temperature was exceed 5 °C . In contrast, with water spray, the temperature rise in the pulp can be firmly controlled under 1°C. The results also indicated that ablation rate and efficiency can be enhanced by increasing the incident radiant exposure and pulse repetition rate, which simultaneously producing more heat accumulation in dental tissue and causing thermal damage to dental tissue. By applying an additional water spray, thermal damage can be significantly reduced in clinical application.

Paper Details

Date Published: 11 December 2012
PDF: 8 pages
Proc. SPIE 8553, Optics in Health Care and Biomedical Optics V, 855321 (11 December 2012); doi: 10.1117/12.1000140
Show Author Affiliations
Xianzeng Zhang, Fujian Normal Univ. (China)
Haibin Zhao, Fujian Normal Univ. (China)
Zhenlin Zhan, Fujian Normal Univ. (China)
Wenqing Guo, Fujian Normal Univ. (China)
Shusen Xie, Fujian Normal Univ. (China)

Published in SPIE Proceedings Vol. 8553:
Optics in Health Care and Biomedical Optics V
Qingming Luo; Ying Gu; Xingde D. Li, Editor(s)

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