Blum J Y, Machtou P, Micallef J P
Dental School of Montpellier, University of Montpellier, France.
J Endod. 1998 Apr;24(4):217-22. doi: 10.1016/S0099-2399(98)80099-X.
The aim of this study was to define the "wedging effect" created by the intracanal forces developed during obturations and to measure it using a force analyzer device. In endodontics, the wedging effect is the result of, for example, a plugger pushing gutta-percha into a canal: the plugger functions much as the rod of a hydraulic jack and the vertical force applied by this rod induces in the cylinder (i.e. the canal) a hydrostatic pressure that is relatively equal in all directions. It is these forces resulting from the hydrostatic pressure that have been labeled the wedging effect. The original device, the Endographe, had a monobloc cupule for measuring the external vertical and horizontal forces developed by a practitioner, but it was unable to measure the intracanal forces. With a new cupule composed of two independent parts joined under pressure, the wedging effect was recorded and analyzed. Two obturation methods, warm vertical compaction and lateral condensation, were performed by endodontists. The forces were depicted by Endogrammes as a function of time. For all of the forces developed during the two techniques, the mean values showed a nonsignificant difference between the different practitioners. The use of graphs provides a new approach to the analysis of intracanal forces as they develop our time and permits the comparison of different obturation techniques.
本研究的目的是确定在根管充填过程中产生的根管内力量所造成的“楔入效应”，并使用一种力分析装置对其进行测量。在牙髓病学中，楔入效应是例如充填器将牙胶尖压入根管的结果：充填器的作用类似于液压千斤顶的活塞杆，该活塞杆施加的垂直力会在缸体（即根管）中产生各个方向相对均匀的静水压力。正是这些由静水压力产生的力被称为楔入效应。原始装置Endographe有一个整体吸盘，用于测量从业者产生的外部垂直和水平力，但它无法测量根管内的力。通过一个由在压力作用下连接在一起的两个独立部分组成的新吸盘，记录并分析了楔入效应。牙髓病医生采用了两种充填方法，热垂直加压充填法和侧向加压充填法。这些力由Endogrammes记录为时间的函数。对于这两种技术过程中产生的所有力，不同从业者之间的平均值显示出无显著差异。使用图表为分析根管内力量随时间的发展提供了一种新方法，并允许对不同的充填技术进行比较。
