Wöstmann Bernd, Balkenhol Markus, Weber Andrea, Ferger Paul, Rehmann Peter
Department of Prosthodontics, Justus-Liebig-University, Schlangenzahl 14, D-35392 Giessen, Germany.
J Dent. 2007 Dec;35(12):939-45. doi: 10.1016/j.jdent.2007.09.010. Epub 2007 Oct 24.
The aim of this retrospective longitudinal study was to evaluate the clinical long-term survival of telescopic crown retained removable partial dentures (TRPDs), the influencing factors on survival as well as the type and number of necessary treatments during the observation time.
The study is based on the data of 463 patients who had received a total of 554 TRPDs with a total of 1758 telescopic crowns between 1995 and 2004 in our Dental School. The influence of the patient's gender, location of the denture, number of abutment teeth per telescopic denture, their distribution (Kennedy-class) and the impact of a routinely follow-up programme on the survival probability were analysed.
During the observation period (mean 5.3+/-2.9 years) 4.7% of the TRPDs ceased functioning and 3.8% of the abutment teeth were extracted. The survival probability after 5 years was 95.1% for the TRPDs and 95.3% for the abutment teeth. No denture with more than four abutments required replacement. Only the covariates number of abutment teeth and patient in-follow-up showed a significant (p<0.01) influence on the survival probability. 26.9% of the TRPDs needed facing repairs, 34.8% relines, 20.6% loss of cementation of a primary crown and 1% abutment tooth treatment.
Within the limits of a retrospective study it can be concluded that the number of attachments and thorough aftercare have a considerable impact on the long-term success of TRPDs. Though loss of cementation and defects of the facings were significant in number, they did not endanger the long-term success of a TRPD at all.
本回顾性纵向研究旨在评估套筒冠固位可摘局部义齿（TRPDs）的临床长期存留率、影响存留率的因素以及观察期内所需治疗的类型和次数。
本研究基于1995年至2004年期间在我校牙科学院接受治疗的463例患者的数据，这些患者共接受了554副TRPDs，共有1758个套筒冠。分析了患者性别、义齿位置、每副套筒冠义齿的基牙数量、基牙分布（Kennedy分类）以及常规随访计划对存留概率的影响。
在观察期（平均5.3±2.9年）内，4.7%的TRPDs失去功能，3.8%的基牙被拔除。TRPDs 5年后的存留概率为95.1%，基牙为95.3%。基牙超过4个的义齿无需更换。只有协变量基牙数量和随访患者对存留概率有显著（p<0.01）影响。26.9%的TRPDs需要饰面修复，34.8%需要重衬，20.6%的初戴冠出现粘结剂脱落，1%需要基牙治疗。
在回顾性研究的范围内，可以得出结论，附着体数量和全面的后续护理对TRPDs的长期成功有相当大的影响。虽然粘结剂脱落和饰面缺陷数量较多，但它们根本不会危及TRPDs的长期成功。
