Er∶YAG激光对牙体硬组织切割效率及表面形态的影响

发布时间：2018-06-15 23:18

本文选题：Er∶YAG激光 + 牙釉质　；参考：《第三军医大学学报》2017年16期

【摘要】：目的观察Er∶YAG激光不同频率和照射时间对牙体硬组织切割效率和表面形态的影响。方法 80个牙釉质样本和80个牙本质样本分别按照射时间10 s和20 s,使用随机数字表法分为两组(n=40),每组再分为5个亚组(n=8),分别用频率为10、15、20、25、30 Hz Er∶YAG激光对每个样本进行照射,体视显微镜测量牙釉质和牙本质凹坑直径、深度,扫描电镜观察牙釉质和牙本质表面形态。结果 Er∶YAG激光频率10~20 Hz、照射时间10 s及20 s时,牙釉质和牙本质凹坑的直径、深度随频率增加和照射时间延长而增加(P0.05);Er∶YAG激光频率25~30 Hz、照射时间10 s及20 s时,牙釉质和牙本质凹坑的直径、深度随频率增加和照射时间延长出现缓慢增加的趋势(P0.05)。扫描电镜下观察,牙釉质和牙本质表面形态发生了一定的变化,Er∶YAG激光频率为25~30 Hz时,牙釉质和牙本质表面出现裂纹、熔融等热损伤现象。结论 Er∶YAG激光适宜的频率和照射时间不仅可以获得牙体硬组织良好的切割效率,而且不会引起牙体硬组织表面形态热损伤。
[Abstract]:Objective to observe the effect of different frequency and irradiation time of er: YAG laser on cutting efficiency and surface morphology of hard tissue. Methods 80 samples of enamel and 80 samples of dentin were randomly divided into two groups according to the firing time of 10 s and 20 s. Each group was divided into 5 subgroups. The diameter and depth of enamel and dentin pits were measured by stereoscopic microscope and the morphology of enamel and dentin surface was observed by scanning electron microscope. Results the diameter and depth of enamel and dentin pits increased with the increase of frequency and irradiation time of 10: YAG laser frequency 10 ~ 20 Hz, irradiation time 10 s and 20 s, and the depth of er: YAG laser frequency increased with the increase of frequency and irradiation time, the frequency of er: YAG laser was 2530 Hz, and the irradiation time was 10 s and 20 s. The diameter and depth of enamel and dentin pits increased slowly with the increase of frequency and irradiation time. The surface morphology of enamel and dentin was observed by scanning electron microscope (SEM). When the frequency of er: YAG laser was 2530 Hz, the surface of enamel and dentin was cracked and melted. Conclusion the suitable frequency and irradiation time of er: YAG laser can not only obtain good cutting efficiency of hard tissue of tooth, but also can not cause thermal damage to the surface of hard tissue of tooth.
【作者单位】：第三军医大学大坪医院野战外科研究所口腔科;第三军医大学西南医院口腔科;襄阳市第一人民医院口腔科;
【基金】：国家自然科学基金面上项目(81470032)~~
【分类号】：R781.05

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