Department of Microbiology, Chulalongkorn University, Bangkok, Thailand.
Int Endod J. 2011 Nov;44(11):1005-10. doi: 10.1111/j.1365-2591.2011.01908.x. Epub 2011 Sep 8.
To evaluate the vertical root fracture resistance of maxillary central incisors filled with different root filling materials and sealers.
Forty maxillary central incisor root canals were instrumented and divided randomly into four groups. Each group was filled using lateral compaction, with gutta-percha and AH Plus, gutta-percha and RealSeal(®) sealer, RealSeal(®) cone and RealSeal(®) sealer, or RealSeal(®) cone and AH Plus, respectively. The roots were loaded vertically by a conical spreader tip inserted into the canal and attached to an Instron testing machine until root fracture occurred. The load at fracture and the pattern of fracture were recorded. Mechanical properties of both core materials were tested under compressive loading. Results were analysed statistically by two-way analysis of variance and post hoc Tukey's tests. An independent sample t-test was used to compare the mechanical properties of the filling materials.
Load at fracture of roots filled with gutta-percha and AH Plus (255 ± 74 N) and gutta-percha and RealSeal(®) sealer (237 ± 38 N) was significantly greater than those filled using the RealSeal(®) system (163 ± 29 N) and RealSeal(®) cone with AH Plus sealer (134 ± 17 N). Most fracture lines were in a bucco-lingual direction. In compressive tests of the core materials, RealSeal(®) had greater flow in response to load than gutta-percha, suggesting more efficient transmission of forces to the canal wall in the fracture tests.
The lower fracture resistance of roots filled using RealSeal(®) is probably the result of more efficient transmission of forces within the canal, rather than a direct effect of the material itself.
评估使用不同根管充填材料和封闭剂对上颌中切牙进行垂直根裂阻力的影响。
40 个上颌中切牙根管被器械处理，并随机分为四组。每组均采用侧向压实技术进行充填，分别使用牙胶和 AH Plus、牙胶和 RealSeal（®）密封剂、RealSeal（®）牙胶尖和 RealSeal（®）密封剂，或 RealSeal（®）牙胶尖和 AH Plus。将锥形扩张器尖端插入根管并连接到 Instron 试验机上，对牙根进行垂直加载，直到牙根发生断裂。记录断裂时的载荷和断裂模式。在压缩载荷下测试两种核心材料的机械性能。结果采用双向方差分析和事后 Tukey 检验进行统计分析。采用独立样本 t 检验比较充填材料的机械性能。
牙胶和 AH Plus（255 ± 74 N）以及牙胶和 RealSeal（®）密封剂（237 ± 38 N）充填的牙根断裂时的载荷明显大于使用 RealSeal（®）系统（163 ± 29 N）和 RealSeal（®）牙胶尖加 AH Plus 密封剂（134 ± 17 N）充填的牙根。大多数断裂线呈颊舌向。在核心材料的压缩测试中，RealSeal（®）在受力时的流动性大于牙胶，这表明在断裂测试中，力更有效地传递到根管壁。
使用 RealSeal（®）充填的牙根断裂阻力较低，可能是由于在根管内更有效地传递了力，而不是材料本身的直接影响。
