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。
Conclusion it is better apical sealing ability in root canals prepared by crown-down technique than step-back technique.
在清理和成形过程中弯曲根管比直根管易于产生各种并发症。本研究用不同的根管器械和预备技术预备弯曲根管。
The incidence of canal complication is higher in curved root canal than in straight one during the instrumentation.
应用推荐