Turk Tugba, Piskin Beyser, Orucoglu Hasan, Aydin Berdan
Department of Endodontics, Ege University, Izmir, Turkiye.
Department of Endodontics, Abant Izzet Baysal University, Bolu, Turkiye.
Eur J Dent. 2015 Jul-Sep;9(3):378-381. doi: 10.4103/1305-7456.163328.
To evaluate the effect of spreader size on apical leakage of maxillary incisor teeth.
A total of 75 permanent human teeth with no carious and no fracture or crack were used for this study. After removing the crown from the cementoenamel junction and the standardization of the root lengths, the specimens were randomly divided into five groups: Group 1 - Roots were not instrumented. Group 2 - Root canals were enlarged using the step-back technique to a #40 file and filled using cold lateral compaction (CLC) of gutta-percha (GP). Group 3 - During the filling procedure, the first spreader used was size 40. Group 4 - The first spreader used was size 35. Group 5 - The initial spreader used was size 25. The amount of leakage through the filled root canals was evaluated by computerized fluid filtration model. Statistical analyzes were done using Kruskal-Wallis test and Mann-Whitney test (P < 0.05).
There were statistically significant differences among the groups (P < 0.05). While the uninstrumented group (Group 1) had no leakage, instrumented but not filled roots (Group 2) demonstrated the highest leakage values. There were no differences between Group 3 and 4. Group 5 showed significantly less leakage than Group 3 and 4.
Spreader size used during CLC of GP appeared to be a significant factor on apical leakage of roots. Using smaller size spreader during CLC may provide relatively less leakage.
评估扩孔钻大小对上颌切牙根尖微渗漏的影响。
本研究共使用75颗无龋坏、无折断或裂纹的恒牙。从牙骨质牙釉质界处去除牙冠并使牙根长度标准化后，将标本随机分为五组：第1组——牙根未进行预备。第2组——采用逐步后退技术将根管扩大至40号锉，并使用牙胶尖冷侧方加压充填（CLC）。第3组——在充填过程中，首次使用的扩孔钻为40号。第4组——首次使用的扩孔钻为35号。第5组——首次使用的扩孔钻为25号。通过计算机化流体过滤模型评估充填根管的渗漏量。采用Kruskal-Wallis检验和Mann-Whitney检验进行统计学分析（P<0.05）。
各组之间存在统计学显著差异（P<0.05）。未预备组（第1组）无渗漏，而预备但未充填的牙根（第2组）渗漏值最高。第3组和第4组之间无差异。第5组的渗漏明显少于第3组和第4组。
牙胶尖冷侧方加压充填时使用的扩孔钻大小似乎是影响牙根根尖微渗漏的一个重要因素。冷侧方加压充填时使用较小尺寸的扩孔钻可能会使渗漏相对较少。
