Nd:YAG激光根管内照射时牙根表面温度的变化

发布时间：2019-07-09 12:13

【摘要】：目的应用Nd:YAG激光进行根管内照射,测量不同能量及频率照射下牙根表面不同部位的温度变化,评价激光根管内消毒过程中牙根邻近组织的安全性。方法收集30颗单根管恒牙,在牙颈部截去牙冠,截取12 mm牙根,根管预备后制成牙根标本,数字化牙科X线机颊舌向平行照射牙根标本,图像分析软件测量牙根颈部(根颈段)和根部(根尖段)中份的邻面根管壁厚度。将牙根标本根据激光照射能量的不同(1.5、3.0、4.5 W)随机分为3组,每组又根据激光照射频率的不同(15、30 Hz)分为2个亚组。将温度测量仪中的两个热电偶分别固定在牙根标本的根颈段及根尖段中份,用Nd:YAG激光通过光导纤维经根管口导入根管内照射20 s,观察在不同能量及频率照射下牙根表面不同部位的温度变化情况。结果应用不同功率照射,牙根表面温度上升变化有统计学差异(P0.01),功率越大,温度上升越多;在相同功率不同频率照射下,牙根表面温度上升变化无统计学差异(P0.05)。在相同功率及频率条件下照射,根尖段温度上升较根颈段大,二者有统计学差异(P0.01)。结论 Nd:YAG激光根管内照射消毒时牙根表面温度上升幅度与照射功率、照射时间及牙根厚度相关,在照射时间20 s功率1.5 W的情况下,牙根及牙周组织是安全的。
[Abstract]:Objective to measure the temperature changes of different parts of root surface under different energy and frequency irradiation by Nd:YAG laser irradiation, and to evaluate the safety of adjacent tissues in the process of laser root canal disinfection. Methods 30 single root canal permanent teeth were collected, the crown was cut off at the neck of the tooth, the root of 12 mm was cut off, and the root specimens were made after root canal preparation. The root specimens were irradiated parallel to the buccal tongue of digital dental X-ray machine. The thickness of the adjacent root canal wall of the root neck (root neck segment) and root (apical segment) was measured by image analysis software. The root specimens were randomly divided into three groups according to the different laser irradiation energy (1.5, 3.0, 4.5W). Each group was divided into two subgroup according to the different laser irradiation frequency (15, 30 Hz). Two thermocouples in the temperature measuring instrument were fixed in the root neck segment and apical segment of the root specimen respectively. Nd:YAG laser was introduced into the root canal through the root canal mouth for 20 s. The temperature changes in different parts of the root surface under different energy and frequency irradiation were observed. Results there was significant difference in the increase of root surface temperature with different power irradiation (P01). The higher the power was, the more the temperature increased, but there was no significant difference in the increase of root surface temperature under the same power and different frequency irradiation (P 0.05). Under the same power and frequency, the temperature of apical segment was higher than that of cervical segment, and there was significant difference between the two groups (P 0.01). Conclusion the increase of root surface temperature is related to irradiation power, irradiation time and root thickness when Nd:YAG laser root canal irradiation sterilizes. When the irradiation time is 20 s and the power is 1.5 W, the root and periodontal tissue are safe.
【作者单位】：北京大学第三医院口腔科;
【分类号】：R781.05

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