Ibarrola J L, Knowles K I, Ludlow M O
Department of Endodontics, Creighton University School of Dentistry, Omaha, Nebraska.
J Endod. 1993 Aug;19(8):417-8. doi: 10.1016/S0099-2399(06)81509-8.
Twenty distal roots of extracted mandibular first and second molars were instrumented, then obturated using Thermafil obturating material with solid plastic core carriers. To simulate a retreatment process, the gutta-percha was softened using one of four solvents, chloroform, xylene, eucalyptol, or halothane. A K file was used to advance the solvent into the gutta-percha and to engage the plastic carrier. In all but one case, the plastic carriers were easily removed from the root canal. It was concluded that the plastic carriers used with the Thermafil obturation media do not present a difficult obstacle for removal should the root require retreatment.
选取20颗拔除的下颌第一和第二磨牙的远中根进行预备，然后使用带有实心塑料核心载体的Thermafil充填材料进行充填。为模拟再治疗过程，使用氯仿、二甲苯、桉叶油或氟烷这四种溶剂之一软化牙胶。使用K锉将溶剂推进牙胶并与塑料载体接触。除1例以外，在所有病例中塑料载体均很容易从根管中取出。得出的结论是，如果牙根需要再治疗，与Thermafil充填介质一起使用的塑料载体不会成为取出的困难障碍。
