一、病例患者杨某某，女，47岁。因下前牙过度磨耗就诊。查：闭锁，互切缘咬在下前牙唇侧牙龈，上颌前部牙槽过高，上颌纵始曲线是反向，曲线最凹处距始平面45mm。临床牙冠全部磨除，磨耗面还低于其周围龈缘0．1－0．8mm。牙冠龈上高度0—3mm。患者面下距离比面中短8mm。二、治 First, the patient Yang Moumou, female, 47 years old. Due to excessive wear on the lower anterior dentist. Check: lock, mutual bite in the lower lip side of the gums, maxillary alveolar hyperextension, upper longitudinal curve is the reverse, the curve from the beginning of the most concave plane 45mm. All clinical crowns worn away, wear surface is also lower than the surrounding gingival margin 0.1-0.8mm. Crown of the crown on the height of 0-3mm. The patient's face is 8mm shorter than the face. Second, governance