Dalat D M, Spångberg L S
University of Connecticut Health Center, School of Dental Medicine, Farmington.
Oral Surg Oral Med Oral Pathol. 1993 Dec;76(6):760-5. doi: 10.1016/0030-4220(93)90049-a.
The effect of post canal preparation on the apical seal of endodontically obturated teeth with plastic Thermafil obturators was studied in vitro. Fifty-four extracted human maxillary anterior teeth were divided into four experimental and two control groups. Two groups were obturated with lateral condensation or plastic Thermafil obturator techniques; this was followed by post space preparation. Two groups were obturated as described above except that post space was not prepared. Apical leakage was determined with the use of 2% methylene blue dye solution at an absolute pressure of 75 mm Hg. There were no statistically significant differences between any of the groups. The clinical implication of these findings is discussed.
体外研究了根管预备后对采用热塑牙胶尖充填根管的牙齿根尖封闭性的影响。54颗拔除的人上颌前牙被分为4个试验组和2个对照组。两组分别采用侧方加压充填法或热塑牙胶尖充填技术进行根管充填；随后进行桩道预备。另外两组的根管充填方法同上，但不进行桩道预备。在75mmHg的绝对压力下，使用2%亚甲蓝染料溶液测定根尖微渗漏情况。各试验组间无统计学显著差异。文中对这些研究结果的临床意义进行了讨论。
