Applications of Ultrasonic Instrument in the Tooth Extraction

对超声拔牙技术进行了基础和临床应用研究。将超声探头插入牙周间隙60- 90 s，在水冷却条件下切割牙周组织。在应用该探针后，用连接有应变计传感器的镊子拔出牙齿。施加到传感器上的力由我们开发的改进的颌力计的装置来转换，并且由数字记录器记录拔牙过程中的力的连续变化，并由个人计算机与我们的原始软件进行分析。根据浸提期间的积分力、浸提持续时间，评价了该方法与用于对照的传统方法相比的有效性。在基础研究中，对组织学表现进行了研究.实验组拔牙时的综合力平均值为2.78 × 10^3 ~ <plus-minus>1.94 × 10^3 kg·s（8颗牙），对照组为4.84 × 10^3 <plus-minus>~ 3.04 × 10^3 kg·s（8颗牙）（p&lt;0.05）。拔牙时间实验组为19.8 ± <plus-minus>9.5s（8颗牙），对照组为32.8 <plus-minus>± 15.4s（8颗牙），两组差异有显著性（P&lt;0.05）。组织学上，实验组拔牙后2周和3周的骨形成略少于对照组.临床研究拔牙过程中的综合力的平均值实验组为1.77 × 10^3 ± <plus-minus>1.62 × 10^3 kg·s（12颗牙），对照组为7.00 × 10^3 ± <plus-minus>5.61 × 10^3 kg·s（12颗牙）（p&lt;0.05）。拔牙时间实验组为10.5<plus-minus>士8.10秒，对照组为36.5<plus-minus>士30.5秒，两组差异有显著性（P&lt;0.05）。未研究伤口愈合延迟。

A technique for tooth extraction using ultrasonic instrument was studied in basic and clinical application. An ultrasonic probe was inserted into the periodontal space for 60-90s to cut the periodontium under water coolant. After application of this probe the tooth was extracted with forceps to which a strain gage sensor was attached. The force applied to the sensor was transduced by an apparatus developed by us to improve the gnathodynamometer, and sequential changes of force during tooth extraction were recorded by a digital recorder and analyzed by a personal computer with our original software. The efficacy of this method compared with the conventional method used for the controls was evaluated in terms of the integrated force during extraction, duration of extraction. In the basic study, histological findings was investigated.1. Basic studyThe resulting mean values obtained of the integrated force during tooth extraction were 2.78x10^3 <plus-minus> 1.94x10^3 kg.s (8teeth) in the experimental group and 4.84x10^3 <plus-minus> 3.04x10^3 kg.s (8 teeth) in the controls (p<0.05). The mean durations of tooth extraction were 19.8 <plus-minus> 9.5s (8 teeth) in the experimental group and 32.8 <plus-minus> 15.4s (8 teeth) in the controls (p<0.05). Histologically, bone formation 2 and 3 weeks after extraction was slightly less in the experimental group than in the controls.2. Clinical studyThe resulting mean values obtained of the integrated force during tooth extraction were 1.77x10^3<plus-minus> 1.62x10^3 kg.s (12 teeth) in the experimental group and 7.00x10^3<plus-minus>5.61x10^3 kg.s (12 teeth) in the controls (p<0.05). The mean duration of tooth extraction were 10.5<plus-minus>8.10s in the experimental group and 36.5<plus-minus>30.5s in the controls (p<0.05). Delay of wound healings were not investigated.