Trope M, Ray H L
Department of Endodontology, Temple University School of Dentistry, Philadelphia, Pa.
Oral Surg Oral Med Oral Pathol. 1992 Jan;73(1):99-102. doi: 10.1016/0030-4220(92)90163-k.
The root canals of 48 single-canal canine teeth were prepared by four different methods. The coronal lingual wall and root canal space were lowered to 2 mm below the buccal wall of the roots. The prepared root was placed into acrylic resin so that 12 mm of buccal root was exposed. A slowly increasing force was applied at the junction of the buccal wall and root canal space until fracture occurred. The force of fracture of the buccal root wall of each root was recorded and the results in each group were compared. All teeth fractured at the buccal wall/acrylic resin junction. Instrumentation of the root canals significantly weakened the roots. Obturation of the canals in conjunction with Roth's 801 sealer did not strengthen the roots. Obturation of the canals in conjunction with a glass ionomer sealer significantly strengthened the roots as compared with roots instrumented but not obturated and those obturated with gutta-percha and Roth's 801 Sealer.
采用四种不同方法对48颗单根管犬牙的根管进行预备。将冠部舌侧壁和根管空间降低至牙根颊侧壁以下2毫米处。将预备好的牙根放入丙烯酸树脂中，使牙根颊侧有12毫米暴露在外。在颊侧壁与根管空间的交界处缓慢施加逐渐增大的力，直至发生折断。记录每颗牙根颊侧根壁的折断力，并比较每组的结果。所有牙齿均在颊侧壁/丙烯酸树脂交界处折断。根管预备显著削弱了牙根。使用Roth 801封闭剂进行根管充填并未增强牙根。与仅进行根管预备但未充填以及用牙胶和Roth 801封闭剂充填的牙根相比，使用玻璃离子封闭剂进行根管充填显著增强了牙根。
