目前，聚碳酸酯齿冠修复前后牙残根、残冠和变色牙取得了较满意的效果，是当代美容牙科的一个重要内容。但是，应用3M聚碳酸酯齿冠来恢复锥形牙、过小牙的形态和功能，国内外报道甚少。笔者自1993年采用美国3M聚碳酸酯齿冠修复上颌锥形牙、过小牙，取得了满意的临床效果。1资料 At present, the tooth crown, crown and discoloration before and after the restoration of polycarbonate crown have achieved satisfactory results, which is an important content of contemporary cosmetic dentistry. However, the application of 3M polycarbonate crown to restore the conical teeth, too small teeth morphology and function, few reports at home and abroad. The author from the United States 3M polycarbonate crown in 1993 to repair the maxillary conical teeth, too small teeth, and achieved satisfactory clinical results. 1 data