Methods Prepare the root canal with routine, stepback, endo-ultrasound, precurve and synthesis methods, then fill the root cannal with gutta percha points, reexaminate after 6 months.
方法采用常规法、逐步后退法、超
法、预弯法和综合法进行根管预备并充
，6
后
查。
Methods Prepare the root canal with routine, stepback, endo-ultrasound, precurve and synthesis methods, then fill the root cannal with gutta percha points, reexaminate after 6 months.
方法采用常规法、逐步后退法、超法、预弯法和综合法进行根管预备并充，6后查。
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