【摘要】 目的:评价不同冠根比的后牙区种植义齿的临床效果。方法:选择2007年1月—2012年1月来诊接受后牙区种植的119例患者,共植入208颗ITI种植体并完成贵金属烤瓷冠修复。修复完成后,根据临床冠根比(crown-to-implant ratio,C/I)分为以下3组:C/I≤1,1<C/I≤1.5,C/I>1.5。随访6～66个月,分别记录3组修复体机械并发症的发生情况。拍摄X线片,测量种植义齿的临床牙冠及牙根长度,计算C/I值及种植体周围骨吸收量。应用寿命表法计算C/I≤1及C/I>1的所有种植义齿的5年累积存留率,采用SPSS 13.0软件包对数据进行统计学分析。结果:所有种植体的平均临床冠根比为1.07±0.24,C/I最小0.6,最大1.8,机械并发症为9.6%。3组不同冠根比种植义齿的机械并发症发生几率及年均骨吸收量均无显著差异(P>0.05)。C/I>1的种植义齿5年累积存留率为97.6%,C/I≤1的5年累积存留率为98.8%。结论:种植义齿的冠根比与种植体周围骨吸收程度及机械并发症的发生几率无相关性,冠根比>1的种植义齿修复效果较好。更多还原

【Abstract】 PORPOSE: To evaluate the influence of crown-to-implant ratio(C/I ratio) on the results of restoration in the posterior region.METHODS: From January 2007 to January 2012,119 patients with 208 ITI implants in the posterior region were followed up for 6-66 months.Implant restorations were divided into three groups according to their respective clinical C/I ratios after noble porcelain-fused-to-mental crown restoration: C/I ≤1,1<C/I ≤1.5,C/I >1.5.Cumulative survival rate was calculated by life-table analysis.SPSS 13.0 software package was used for statistical analysis.RESULTS: The mean clinical C/I ratio of 208 implants was 1.07±0.24,with maximum C/I of 1.8 and C/I of 0.6,9.6% of 208 implants had biomechanical complications.Differences among three groups were not statistically significant in annual crestal bone loss and biomechanical complications.In addition,implant cumulative survival rate in C/I ratio>1 was 97.6%,and 98.8% in C/I ≤1.CONCLUSIONS: Clinical C/I ratio does not significantly influence peri-implant crestal bone loss and biomechanical complications,implant restorations with C/I ratios>1 is successfully used in the posterior areas in this study.更多还原