Nd:YAG Laser therapy device for caries control and prevention and its influence on temperature of isolated tooth pulp chamber

国际生物医学工程杂志 Pub Date : 2019-12-28 DOI:10.3760/CMA.J.ISSN.1673-4181.2019.06.012

Xiaoyue Liang, Zhaohui Zou, Xiaoxi Dong, Ranran Du, Yu Zhang

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Abstract

Objective To analyze the influence of a dental caries phototherapy device using neodymium-yttrium-aluminum-garnet (Nd:YAG) laser on the temperature of tooth pulp chamber of different sites and morphologies under different irradiation duration and power. Methods Fifty intact isolated teeth were collected and randomly divided into middle incisor group, upper right first premolar group, upper right second molar group, upper left first premolar group, and upper left second molar group. Each experimental group was irradiated according to the laser power 1.5, 1.6, 1.7, 1.8, 1.9 and 2.0 W, and the irradiation duration 30, 60, 90 s. The temperature rise of the pulp chamber was recorded with a thermocouple thermometer. Results After the laser irradiation, the temperature of the tooth pulp chamber increased, and the temperature rise was less than 5.5 ℃, i.e. the threshold leading to the dental pulp necrosis. Conclusions The use of laser to prevent dental caries will increase the temperature of the tooth pulp chamber, but the temperature rise in the range of 5.5 ° C is relatively safe and will not cause irreversible damage to the pulp tissue. Key words: Oral phototherapy device; Laser; Pulp chamber; Temperature

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Nd:YAG激光防龋装置及其对离体牙髓腔温度的影响

目的分析采用钕钇铝石榴石(Nd:YAG)激光治疗龋病的装置在不同照射时间和功率下对牙髓腔不同部位和形态温度的影响。方法收集50颗完整离体牙，随机分为中切牙组、右上第一前磨牙组、右上第二磨牙组、左上第一前磨牙组和左上第二磨牙组。实验组分别按激光功率1.5、1.6、1.7、1.8、1.9、2.0 W，照射时间30、60、90 s进行照射。用热电偶温度计记录了牙髓腔的温升。结果激光照射后牙髓腔温度升高，且温升小于5.5℃，即导致牙髓坏死的阈值。结论使用激光预防龋病会使牙髓腔温度升高，但温度升高在5.5℃范围内是相对安全的，不会对牙髓组织造成不可逆的损伤。关键词:口服光疗仪;激光;髓室;温度

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