Walsh L J
University of Queensland Dental School, Brisbane, Australia.
Braz Dent J. 1996;7(1):5-11.
Thermal insult to pulpal tissue is recognized as a major limitation to the use of lasers for dental hard-tissue procedures. This study examined thermal changes at the level of the dental pulp in human molar teeth irradiated with a CO2 dental laser using a pulsed mode of operation. Sectioned molar teeth were exposed, in vitro, to CO2 laser radiation. The laser parameters were those used clinically for laser desensitization and laser-enhanced fluoride treatment. Fissure regions and root surfaces were irradiated. For settings which might reasonably be used clinically, the temperature rise was not of a magnitude which would be expected to cause pulpal inflammation or necrosis. With regard to thermal properties of tooth structure, times taken to reach the maximum temperature reduced, and times taken to cool to baseline increased with increasing laser exposures.
对牙髓组织的热损伤被认为是激光用于牙科硬组织手术的主要限制因素。本研究使用脉冲操作模式，研究了用二氧化碳牙科激光照射的人类磨牙牙髓水平的热变化。将磨牙切片在体外暴露于二氧化碳激光辐射下。激光参数是临床上用于激光脱敏和激光增强氟化物治疗的参数。对裂隙区域和牙根表面进行了照射。对于临床上可能合理使用的设置，温度升高的幅度不会导致牙髓炎症或坏死。关于牙齿结构的热特性，随着激光照射次数的增加，达到最高温度所需的时间减少，冷却至基线所需的时间增加。
