Comparison of friction force between Lock-loose bracket and traditional bracket
Liu Xiaowei, Yang Luyi, Zhu Huifang, Dong Yan, Wang Qi, Jiang Wei, Wu Yanran.
West China Journal of Stomatology . 2014, (6): 570 -574 .  DOI: 10.7518/hxkq.2014.06.009

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