Clinical Evaluation of Differ ent Angulation Radiogr aph in Diagnosing Multiple Canals of Mandibular Fir st Pr emolar s in vivo

WANG Huan, YIN Xing- zhe, WANG Qian- qian, ZHANG Cheng- fei

West China Journal of Stomatology . 2007, (02): 156 -158 .