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作者进行本实验的目的是研究经三种不同激光照射后的牙齿根管的根尖区形态变化及温度上升情况。 以72颗离体单根牙为研究对象,每牙截冠后进行常规根管预备,将它们随机均分为三个大组,每大组又均分为三个小组。三种激光为Nd:YAG激光、CO_2激光和氩激光,激光照射前2/3标本用36％氟化铵银或印度墨汁染色,其余1/3作为空白对照。激光和染色情况的9种组合分属9个小组。实验中,将激光发射仪的光学纤维或金属尖端插至根管的根尖区,以一定的功率(1W,2W或3W)照射一定的时间(0.5s,1s,2s
The purpose of this experiment is to study the morphological changes and temperature rise of apical region of root canal after three kinds of laser irradiation. Totally 72 isolated single rooted teeth were used as the research object. After root crowding, conventional root canal preparation was performed. They were randomly divided into three groups, each of which was divided into three groups. The three kinds of laser were Nd: YAG laser, CO_2 laser and argon laser. The two thirds before laser irradiation were stained with 36% ammonium fluoride silver or Indian ink, and the remaining one third were used as blank control. The nine combinations of laser and staining fall into nine groups. Experiment, the laser transmitter optical fiber or metal tip inserted into the apical region of the root canal to a certain power (1W, 2W or 3W) irradiation for a certain period of time (0.5s, 1s, 2s