Blum J Y, Machtou P, Micallef J P
University Hospital Center of Montpellier, France.
J Endod. 2001 Aug;27(8):503-7. doi: 10.1097/00004770-200108000-00002.
The forces and torque applied during the balanced-force motion technique of root canal preparation were measured with the Endographe. Five endodontists prepared 100 extracted teeth, all straight and with similar root anatomy. The assignment of "tooth practitioner" was randomized. Gates-Glidden burs were used to prepare the coronal part and ensure apical patency for the other instruments. The balanced-force technique with conventional instruments was then used for the body of the canal. For the apical part either the watch-winding pull with conventional instruments or the reversed balanced-force technique with manual GT files was used. The Endogrammes were similar among endodontists for the coronal phase and showed low vertical forces in contrast with the lateral forces. For the body the Endogrammes were highly specific and described perfectly the different steps of instrument work. For the apical part the Endogrammes of the conventional instruments showed a lack of vertical forces. The Endogrammes of the manual GT files showed that torque was applied inversely to that of the conventional instruments. Force application was similar. In conclusion these objective data indicate the correct way of working with the different techniques incorporated into the balanced-force motion technique.
使用Endographe测量根管预备平衡力运动技术过程中施加的力和扭矩。五位牙髓病医生对100颗拔除的牙齿进行预备，所有牙齿均为直根管且牙根解剖结构相似。“牙齿-医生”的分配是随机的。使用Gates-Glidden钻针预备冠部，并确保其他器械能到达根尖通畅。然后用传统器械采用平衡力技术预备根管体部。对于根尖部分，要么使用传统器械的捻搓提拉法，要么使用手动GT锉的反向平衡力技术。牙髓病医生在冠部阶段的Endogrammes相似，与侧向力相比显示出较低的垂直力。对于根管体部，Endogrammes具有高度特异性，完美地描述了器械操作的不同步骤。对于根尖部分，传统器械的Endogrammes显示缺乏垂直力。手动GT锉的Endogrammes显示扭矩施加方向与传统器械相反。力的施加相似。总之，这些客观数据表明了在平衡力运动技术中结合不同技术的正确操作方法。
