Szeremeta-Browar T L, VanCura J E, Zaki A E
Oral Surg Oral Med Oral Pathol. 1985 Jan;59(1):82-7. doi: 10.1016/0030-4220(85)90121-5.
Single-rooted teeth were instrumented and filled in vitro with a lateral condensation of gutta-percha with sealer. Following obturation, the tooth apices were treated by various retrograde procedures. The teeth were then coated with ethyl acetate, immersed in 45Ca solution, washed, and sectioned, and autoradiographs were used to compare the leakage of the various techniques. Statistical analysis indicated that lateral condensation produced a significantly better seal than any retrograde technique tested except retrofilling with Super EBA cement and that a significantly worse seal was obtained with amalgam retrofill when compared to all retrograde techniques except cold-burnished gutta-percha following apicoectomy. No significant difference existed between other group combinations.
单根牙在体外进行预备并使用牙胶侧方加压结合封闭剂进行充填。充填完成后，对牙根尖采用不同的倒充填方法进行处理。然后将牙齿用乙酸乙酯包被，浸入45Ca溶液中，冲洗后切片，通过放射自显影片比较不同技术的微渗漏情况。统计分析表明，除了用超EBA水门汀进行倒充填外，牙胶侧方加压技术产生的封闭效果明显优于所测试的任何一种倒充填技术；与除根尖切除术后冷加压牙胶外的所有倒充填技术相比，汞合金倒充填获得的封闭效果明显较差。其他组间组合不存在显著差异。
