Portmann P, Lussi A
Department of Operative, Preventive, and Pediatric Dentistry, University of Berne, School of Dental Medicine, Switzerland.
J Endod. 1994 Jun;20(6):292-5. doi: 10.1016/s0099-2399(06)80819-8.
A new machine that allows cleaning root canals without conventional instruments has been introduced. Because this noninstrumented technique does not enlarge the root canal system, a new device had to be developed to fill the root canal system. The new machine was able to produce a vacuum that allowed proper drying and filling of a root canal system. This study evaluated the new vacuum filling method and compared it with lateral condensation. Canals of 40 extracted human molars, instrumented using the step-back technique, were either filled with the new vacuum obturation technique using AH26 sealer and a gutta-percha single cone or by lateral condensation. Teeth were coated with wax and placed into India ink for 7 days. The wax was then removed and the teeth were cleared. All teeth were evaluated for linear dye penetration using a x20 viewer. Obturation with the new vacuum technique resulted in significantly less leakage than lateral condensation.
一种无需传统器械就能清洁根管的新机器已被引入。由于这种非器械技术不会扩大根管系统，因此必须开发一种新设备来填充根管系统。这台新机器能够产生真空，从而实现对根管系统的适当干燥和填充。本研究评估了这种新的真空填充方法，并将其与侧向加压充填法进行了比较。使用逐步后退技术对40颗拔除的人磨牙进行根管预备，然后分别采用新的真空充填技术（使用AH26封闭剂和一根牙胶尖）或侧向加压充填法进行充填。将牙齿涂上蜡并置于印度墨水中7天。然后去除蜡并清理牙齿。使用20倍放大镜对所有牙齿的线性染料渗透情况进行评估。与侧向加压充填法相比，采用新的真空技术进行充填导致的微渗漏明显更少。
