酯;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
法、逐步后退法、超声法、
弯法和综合法进行根管
充填，6个月后复查。
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.
方法采用常法、逐步后退法、超声法、弯法和综合法进行根管充填，6个月后复查。
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