Economides N, Liolios E, Kolokuris I, Beltes P
Department of Endodontology, Dental School, Aristotle University, Thessaloniki, Greece.
J Endod. 1999 Feb;25(2):123-5. doi: 10.1016/S0099-2399(99)80010-7.
The purpose of this study was to examine the effect of the smear layer on apical microleakage over 16 wk. One hundred and four extracted human teeth were assigned to four groups treated as follows: group A1--smear layer was left intact and canals were obturated with gutta-percha and Roth 811; group A2--smear layer was left intact and canals were obturated with gutta-percha and AH26; group B1--smear layer was removed and canals were obturated with gutta-percha and Roth 811; and group B2--smear layer was removed and canals were obturated with gutta-percha and AH26. Microleakage was measured by the electrochemical method. In parallel, 12 teeth were examined under a scanning electron microscope. The results indicated that the smear layer removal resulted in a statistically significant reduction of microleakage values in groups obturated with AH26. The presence or absence of smear layer had no significant effect on the sealing ability of Roth 811.
本研究的目的是检测16周内玷污层对根尖微渗漏的影响。104颗拔除的人牙被分为四组，处理如下：A1组——玷污层保持完整，根管用牙胶和Roth 811充填；A2组——玷污层保持完整，根管用牙胶和AH26充填；B1组——去除玷污层，根管用牙胶和Roth 811充填；B2组——去除玷污层，根管用牙胶和AH26充填。采用电化学方法测量微渗漏。同时，在扫描电子显微镜下检查12颗牙齿。结果表明，在使用AH26充填的组中，去除玷污层导致微渗漏值在统计学上显著降低。玷污层的存在与否对Roth 811的封闭能力没有显著影响。
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