Intrapulpal temperatures during pulsed Nd:YAG laser treatment of dentin, in vitro.
Intrapulpal temperatures during pulsed Nd:YAG laser treatment of dentin, in vitro.
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DOI：
10.1902/jop.1994.65.3.255
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发表时间：
1994-03
影响因子：
4.3
通讯作者：
J. White;Mark C. Fagan;H. Goodis
中科院分区：
文献类型：
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作者：
J. White;Mark C. Fagan;H. Goodis
激光被用于软组织去除、龋齿去除和根表面敏感性的治疗。激光安全性的一个问题是，在照射的根表面产生的热量可能会扩散到牙髓，造成不可逆的牙髓损伤。为了测试这种热扩散，铜康铜热电偶被插入到根牙髓管提取的牙齿。模拟牙龈切除、浅表龋齿去除和牙本质表面修饰以治疗根表面敏感性期间可能发生的直接暴露，使用直径为320微米的光纤接触探针用脉冲Nd：YAG激光均匀照射2 mm2的外根表面区域。功率从0.3到3.0 W变化，频率为10和20 Hz。还记录了使用带有空气冷却剂的高速手机进行腔体制备期间的温度变化。重复测量方差分析（P <或= 0.05）表明，牙髓内温度作为功率，频率和时间的函数增加。对于每个激光参数，随着剩余牙本质厚度（0.2至2.0 mm）的增加，髓内温度降低。如本文所述，使用Nd：YAG脉冲激光照射牙本质，在治疗时间、功率和频率范围内，并保持足够的牙本质厚度，不应导致失活牙髓内温度升高。
Lasers are being used for soft tissue removal, caries removal, and treatment of root surface sensitivity. One concern for laser safety is that the heat produced at the irradiated root surface may diffuse to the pulp causing irreversible pulpal damage. To test this heat diffusion, copper-constantan thermocouples were inserted into the radicular pulp canals of extracted teeth. Simulating direct exposure which might occur during gingival excision, superficial caries removal, and modification of the dentin surface for treatment of root surface sensitivity, a 2 mm2 area of the external root surface was uniformly irradiated with a pulsed Nd:YAG laser using a 320 microns diameter fiber optic contact probe. Power was varied from 0.3 to 3.0 W with frequencies of 10 and 20 Hz. Temperature changes during cavity preparations using a high speed handpiece with air coolant were also recorded. Repeated measures ANOVA (P < or = 0.05) indicated that intrapulpal temperatures increased as a function of power, frequency, and time. Intrapulpal temperatures decreased as remaining dentin thickness (0.2 to 2.0 mm) increased for each laser parameter. Irradiation of dentin using a Nd:YAG pulsed laser, within the treatment times, powers, and frequencies with adequate remaining dentin thickness, as outlined in this paper, should not cause devitalizing intrapulpal temperature rises.