牙楔状缺损是牙颈部硬组织缓慢磨耗所致的缺损，由于这种缺损常呈楔形而得名。

Wedge-shaped defect is an abrasion that caused by long-term abrasion in tooth cervical.

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目的了解老年人牙楔状缺损的流行病学情况，为开展老年社区医疗保健服务，提供较为确切的依据。

Objective to get the epidemiological information of the teeth wedge-shaped defects of the aged, in order to provide data for developing community health services for the elderly.

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方法：选择相邻的前磨牙楔状缺损患者76例218颗患牙，随机分为2组，第一组修复前预备洞型；第二组修复前不预备洞型。

Methods: 76 old people of 218 premolar teeth with wedge-shaped defect were divided into two groups randomly: the teeth were prepared in the first group but not in the second group.

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