自Miller 1958年重新介绍覆盖义齿以来,有关报道很多。作者总结本科1973年以来的覆盖义齿资料,纵向研究导致基牙丧失的有关问题。材料与方法 Lowa大学修复科1973～1985年的覆盖义齿患者,共254人,平均年龄58.6岁。大部份患者一次根管治疗,根面银汞或复合树脂充填,基牙降至龈上1.5～2mm。3.2%的基牙作金合金帽,14名患者82 Many reports have been reported since Miller reintroduced the overdenture in 1958. The author summarizes undergraduate over-denture data since 1973 and longitudinally studies the issues that led to the loss of abutments. Materials and Methods Lowa University Department of prosthetics patients from 1973 to 1985 covered a total of 254 people, with an average age of 58.6 years. Most patients with primary root canal therapy, root silver or composite resin filling root, the gum fell to 1.5 ~ 2mm. 3.2% of abutments for gold alloy cap, 14 patients 82