Results:The distance between buccal border of buccal grooves of mandibular the first molar and the posterior border of lingula of the opposite mandible was 8.9±0. cm .
Results:The distance between buccal border of buccal grooves of mandibular the first molar and the posterior border of lingula of the opposite mandible was 8.9±0. cm .
果：由下颌第一磨牙颊沟的颊缘水平伸至对侧下颌小舌后缘间距离为8．9±0．cm；