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30个模型根管和23对新鲜离体人牙,经超声器械和手持器械根管预备后,对根管横断面的大小、形态、残余物及操作时间做了定量分析比较。结果:模型根管未显示出两种方法在根管扩大、成形方面的差别(p>0.05);离体牙根管土部也未显示出两种方法的差别,根管中部的扩大、清理效果都以超声组的较好(p<0.05),根管下部的扩大效果,超声组虽不如对照组(p<0.05),但清理效果仍略优。另外,用超声器械进行根管预备可节省时间。
30 models of root canals and 23 pairs of freshly isolated human teeth, ultrasonic instruments and handheld instruments after root canal preparation, the root canal cross-sectional size, shape, residue and operating time were quantitative analysis and comparison. Results: The model root canal did not show the difference between the two methods in root canal enlargement and shape (p> 0.05). The difference between the two methods did not show in the root canal. The middle root canal was enlarged and cleaned up The effect was better in ultrasound group (p <0.05), the expansion of the lower part of the root canal, ultrasound group, although not as good as the control group (p <0.05), but the cleaning effect is still slightly better. In addition, root canal preparation with an ultrasonic device saves time.