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目的：通过对上、下颌第一磨牙不同部位生理性磨耗的观察，探讨磨耗特征及其生理意义。方法：５５１ 个上颌第一磨牙和６８６ 个下颌第一磨牙，根据磨耗程度分为轻、中、重度（ 绝对磨耗程度），根据单个牙上不同部位磨耗程度排序（ 相对磨耗程度），比较各部差别。结果： 上颌第一磨牙磨耗程度由重到轻排序：近、远舌尖＞ 近、远中边缘嵴＞ 近、远颊尖；下颌第一磨牙排序：远中尖、远中边缘嵴＞ 近、远颊尖＞ 远舌尖＞ 近舌尖、近中边缘嵴。结论：上颌第一磨牙以舌尖磨耗最重，而下颌第一磨牙则为远中部磨耗最重，可能与局部咬合力作用时间及作用强度有关。
OBJECTIVE: To investigate the characteristics of wear and its physiological significance by observing the physiological wear of different parts of upper and lower first molars. Methods: 551 maxillary first molar and 686 mandibular first molar were divided into mild, moderate and severe degree (absolute degree of wear) according to the degree of wear. According to the degree of wear of different parts of a single tooth (relative degree of wear) . Results: The degree of abrasion of the maxillary first molar was ranked as follows: near and far tongue tip> near and far edge of the edge> near and far buccal cusp; mandibular first molar order: distal tip, distal edge ridge> near and far Buccal> distal tongue> near the tip of the tongue, near the edge of the ridge. CONCLUSION: The maxillary first molars wear the most of the tongue, while the first molars of the mandible is the heaviest wear in the distal center, which may be related to the time and intensity of local bite force.