The clinical analysis on the effects of different difficulty in root canal preparation
WANG Rui1, GAO Xiaojie1, SUN Tuo-qi1, TAN Hong2, HUANG Ding-ming2
West China Journal of Stomatology . 2011, (02): 146 -148 .  DOI: 10.3969/j.issn.1000-1182.2011.02.010

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