Objective:To compare the apical sealing ability of different root canal filling means.

目的：比较不同根管充填方法对根尖孔的封闭能力。

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Conclusion it is better apical sealing ability in root canals prepared by crown-down technique than step-back technique.

结论短期内冠根向预备技术比逐步后退技术成形的根管更有利于根管充填后根尖孔的密封。

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Objective To compare the apical sealing ability of Sankin hydroxyapatite root canal sealer with traditional root canal sealers.

目的比较三金羟磷灰石根管封闭剂与传统根管封闭剂的封闭能力。

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