Mandel E, Friedman S
Department of Endodontics, University of Paris VII, France.
J Endod. 1992 Nov;18(11):565-9. doi: 10.1016/S0099-2399(06)81216-1.
During nonsurgical endodontic retreatment, endodontic instruments are forced apically to remove the root canal filling material and regain canal patency. Undiscriminating burrowing down the canal in the apical direction may be fruitless and harmful. To avoid complications, the dentin overhanging the canal orifice must be removed and an unobstructed access established to the root filling material, so as to facilitate its removal. Reinstrumentation of the filled canal must take into consideration the nature of the filling material and the physical properties of endodontic instruments, as well as the dynamic aspects of canal preparation. This article discusses the mechanical considerations pertaining to root canal retreatment and outlines a step by step rationale approach to retreatment.
在非手术牙髓再治疗过程中，牙髓治疗器械需向根尖方向用力，以去除根管充填材料并恢复根管通畅。盲目地向根尖方向钻入根管可能徒劳无功且有害。为避免并发症，必须去除根管口上方悬突的牙本质，建立通向根管充填材料的无阻碍通道，以便于其去除。对已充填根管的再预备必须考虑充填材料的性质、牙髓治疗器械的物理特性以及根管预备的动态因素。本文讨论了根管再治疗相关的力学因素，并概述了一种逐步进行再治疗的合理方法。
