后牙弯曲根管充填方法的根尖封闭能力研究

A comparative study of apical sealing ability on filling techniques for curved canal of posterior teeth

本实验用常规法、逐步后退法和超声法三种方法预备后牙弯曲细小根管，再分别用传统侧压充填法和热侧压充填法进行充填，然后比较其根尖封闭能力。结果表明：热侧压充填法的根尖封闭能力优于传统的侧压充填法，并能在一定程度上弥补常规法和超声法预备弯曲细小根管成形不佳的缺陷。

A comparison of apical leakage produced by three preparation techniques and two obturation methods was done in this article.The fine curved canals were prepared with routine preparation technique,ultrasonic technique,step back technique and filled with traditional lateral condensation,warm gutta percha lateral condensation separately.The result showed that the apical sealing ability of warm gutta percha lateral condensation was superior to traditional lateral condensation.It could remedy the defect of irregular canal shape of fine curved canal preapred with routine technique and ultrasonic technique in some degree by the improvement of apical sealing ability.