Wu M K, De Gee A J, Wesselink P R
Department of Cariology and Endodontology, Academic Centre for Dentistry Amsterdam (ACTA), The Netherlands.
J Endod. 1997 May;23(5):331-6. doi: 10.1016/S0099-2399(97)80417-7.
Condensing warm gutta-percha (GP) can greatly reduce the distance between the GP and the root canal walls (RCW). Different sealers with different film thicknesses may seal such close fits differently. With the use of a fluid transport model, leakage of AH26 and Ketac-Endo used with injected warm GP to fill root canals was measured. The distance between the condensed GP and RCW and the film thickness of the two sealers was determined as well. After condensation, the distance between GP and RCW was mostly less than 25 microns. AH26, with a film thickness of 39 microns, leaked more than Ketac-Endo (p < 0.05) of which the film thickness was 22 microns. It seems that film thickness of sealer is an influencing factor on the sealing ability of a root canal filling when condensation of thermoplasticized GP is performed.
热凝牙胶（GP）能大幅缩短牙胶与根管壁（RCW）之间的距离。不同薄膜厚度的不同封闭剂可能对这种紧密贴合的密封效果各异。运用流体传输模型，测量了AH26和Ketac-Endo与注入的热凝GP一起用于充填根管时的渗漏情况。同时测定了热凝牙胶与根管壁之间的距离以及两种封闭剂的薄膜厚度。热凝后，牙胶与根管壁之间的距离大多小于25微米。薄膜厚度为39微米的AH26的渗漏比薄膜厚度为22微米的Ketac-Endo更多（p<0.05）。当进行热塑性牙胶的热凝操作时，封闭剂的薄膜厚度似乎是根管充填密封能力的一个影响因素。
