LF托槽与传统直丝弓托槽对非拔牙安氏1类病例的临床对比
LF탁조여전통직사궁탁조대비발아안씨1류병례적림상대비
Comparative Study on the Treatment Efficiency Between LF Bracket and Conventional Pre-adjusted Bracket to the Treating Angle Class Ⅰ Non-extraction Cases
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