Conclusions: Ultrasonic subgingival scaling is effective on the treatment of chronic periodontitis as well as hand instrumentation.
结论：超声龈下洁治和手工龈下刮治一样能够有效地治疗慢性牙周炎。
Conclusion the combined application of sonic and hand file instrumentation was conduced to improve the effect of root canal preparation.
结论声波器械和手用器械的联合应用，有助于提高根管预备的效果。
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