TIAN Li- li1, LIANG Wei2, LI Ling- min2, MAI Han- chao2. Thr ee- dimensional finite element initial analysis on the structur e defect r estor ation of mandibular fir st molar under static and impact loads TIAN Li- li1, LIANG Wei2, LI Ling- min2, MAI Han- chao2[J]. West China Journal of Stomatology.