根尖预备直径对下前磨牙牙根抗折强度的影响
田诗雨1, 白伟2, 梁宇红1,△

Impact of apical preparation diameter on fracture resistance of mandibular premolar roots
TIAN Shi-yu1, BAI Wei2, LIANG Yu-hong1,△
实验组牙根抗压载荷