Visser H, Mausberg R, Fastenmeier K, Lohr G
Abteilung Parodontologie, Georg-August-Universität Göttingen.
Schweiz Monatsschr Zahnmed. 1994;104(3):278-83.
Dental electrosurgery carries the risk of incidental contact between the active electrode and metallic restorations. So far, on-line measurements of basic physical parameters during dental electrosurgery have not been performed under realistic conditions. The aim of our experimental study in pig jaws was to describe the physical phenomena more closely. 86 teeth in the jaws of freshly slaughtered pigs received occlusal amalgam fillings. Using 3 different units electrosurgical procedures were performed adjacent to the fillings. Voltage, current, impedance and power output were registered using a computer-controlled measuring system with high temporal resolution and broad dynamic range. The impedances of the amalgam fillings ranged from 0.5 to 9 k omega, with half of them being in the lower range of 0.5 to 1.5 k omega. During contact to amalgam fillings the dental electrosurgical unit had a high power output. Contact to fillings with low impedance yielded a power output up to 50 W. The other two electrosurgical units were equipped with different power output control systems thus preventing high power output during contact to metallic restorations. In conclusion, dental electrosurgery should be improved by units with dynamic power output control.
牙科电外科手术存在活性电极与金属修复体发生意外接触的风险。到目前为止，尚未在实际条件下对牙科电外科手术期间的基本物理参数进行在线测量。我们在猪颌骨上进行实验研究的目的是更深入地描述物理现象。刚屠宰的猪颌骨中的86颗牙齿接受了咬合面汞合金充填。使用3种不同的设备在充填物附近进行电外科手术操作。使用具有高时间分辨率和宽动态范围的计算机控制测量系统记录电压、电流、阻抗和功率输出。汞合金充填物的阻抗范围为0.5至9 kΩ，其中一半处于0.5至1.5 kΩ的较低范围。在与汞合金充填物接触期间，牙科电外科设备的功率输出很高。与低阻抗充填物接触时，功率输出可达50 W。另外两个电外科设备配备了不同的功率输出控制系统，从而防止在与金属修复体接触时出现高功率输出。总之，牙科电外科手术应通过具有动态功率输出控制的设备加以改进。
