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本研究的目的旨在评价在离体不同条件下,ErCr:YSGG激光根管内照射后根管壁的形态学改变及根面的温度改变。 作者选取60个单直根管的拔除人牙,断冠,依逐步后退法作根管预备、冲洗,用可弯曲光纤(尖直径为750μm)将ErCr:YSGG激光(波长2.78μM、脉冲时间140～200μs、重复功率20 Hz)平行根管壁导入根管,反复缓慢上下移动照射。60个牙随机分为两组,每组再分6小组,每小组5个牙。第一组输出功率为1～6W,无水喷冷却;第二组输出功率为
The purpose of this study was to evaluate the morphological changes and root temperature changes of root canal after ErCr: YSGG laser in vitro. The author selected 60 single straight root canal extraction of human teeth, broken crown, according to the step-by-step retrograde method for root canal preparation, rinsing, with flexible fiber (tip diameter of 750μm) ErCr: YSGG laser (wavelength 2.78μM, pulse time 140 ~ 200μs, repetitive power 20Hz) parallel to the root canal into the root canal, slowly moving up and down repeatedly irradiation. Sixty teeth were randomly divided into two groups, each subdivided into 6 subgroups and 5 subgroups per subgroup. The first group of output power of 1 ~ 6W, spray water cooling; the second group of output power