Comparative study of torque expression and its biomechanical effects: spherical self-ligating bracket with lock-hook system versus passive self-ligating bracket and conventional br... by Yudong Liu, Longmei Guo, Yanqing Feng, Jiahao Hua, Qingyuan Dai, Ziyang Chen, Wenlu Song, Bing Guo, Taicong Chen, Li Ji

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