Wu M K, Fan B, Wesselink P R
Department of Cariology Endodontology Pedodontology, ACTA, Louwesweg 1, 1066 EA, Amsterdam, The Netherlands.
J Endod. 2000 Apr;26(4):210-6. doi: 10.1097/00004770-200004000-00003.
Occurrence of apical transportation (AT) may complicate the root filling procedure and result in a compromised seal. In part I of this study, human mandibular premolars with single, curved (21 to 39 degrees), or straight canals were prepared by Lightspeed or a step-back hand filing technique. An AT index was determined using a double exposure radiographic technique. The prepared canals were obturated using lateral condensation of gutta-percha. Leakage along the apical 3 mm of root filling was measured with a fluid transport model. After hand filing, AT and perforation occurred in 87% of the curved canals. The AT indices were > or = 0.4 mm. After Lightspeed preparation, AT occurred in only 19% of the curved canals. The hand filing/curved group leaked statistically significantly more than the hand filing/straight and Lightspeed/curved groups (p = 0.002). We conclude that occurrence of AT is a factor that negatively influences the apical seal when curved canals are obturated by lateral condensation of gutta-percha.
根尖移位（AT）的发生可能会使根管充填过程复杂化，并导致封闭效果受损。在本研究的第一部分中，使用LightSpeed或逐步后退法手动锉技术对具有单根管、弯曲（21至39度）或直根管的人类下颌前磨牙进行预备。使用双曝光射线照相技术确定AT指数。使用牙胶侧向加压法对预备好的根管进行充填。使用流体传输模型测量沿根管充填根尖3毫米处的渗漏情况。手动锉预备后，87%的弯曲根管出现了根尖移位和穿孔。AT指数≥0.4毫米。使用LightSpeed预备后，仅19%的弯曲根管出现根尖移位。手动锉/弯曲组的渗漏在统计学上显著多于手动锉/直根管组和LightSpeed/弯曲组（p = 0.002）。我们得出结论，当通过牙胶侧向加压法充填弯曲根管时，根尖移位的发生是对根尖封闭产生负面影响的一个因素。
