Department of Prosthodontics, Regensburg University Medical Center, 93042 Regensburg, Germany.
Clin Oral Investig. 2012 Apr;16(2):401-5. doi: 10.1007/s00784-011-0511-5. Epub 2011 Feb 2.
This retrospective study investigated the frequency and time history of chipping or facings failure of three-unit and four-unit tooth-supported metal ceramic (MC) fixed partial prostheses (FPDs). Six hundred fifty-four MC FPDs were inserted according to a standardized treatment protocol at the Department of Prosthodontics of the Regensburg University Medical Center between 1984 and 2009. Frequency and time history of chipping or facings failure as well as possible risk factors were evaluated on the basis of historical clinical data. We estimated the survival times of FPDs by means of the Kaplan-Meier analysis. The 5-year survival rate (time to renewal of a FPD) of all MC FPDs was 94%; the 10-year survival rate was 87%. Twenty-eight (4.3%) MC FPDs showed chipping; the 5-year free-of-event rate of chipping was 95%, the 10-year rate was 94%. Possible risk factors had no statistically significant influence on chipping or facings failure. The annual hazard rate of MC chipping in the first year was 0.03, i.e., 3 out of 100 person-years of exposure showed chipping. The annual hazard rates for the next 6 years dropped to 0.009, 0.003, 0.007, 0.004, 0.005, and 0.007. Thus, about 3-9 out of 1,000 person-years of exposure showed chipping. Patients with MC FPD may expect a long survival rate of their restoration. During the first year, the risk of chipping may be higher than during the following years. Despite the long period of experience with MC FPDs, chipping of the facing will still occur.
本回顾性研究调查了三单位和四单位牙支持金属陶瓷（MC）固定局部义齿（FPD）的碎裂或贴面失败的频率和时间历程。1984 年至 2009 年期间，根据标准化治疗方案，雷根斯堡大学医学中心修复科共植入 654 个 MC FPD。基于历史临床数据，评估了碎裂或贴面失败的频率和时间历程以及可能的危险因素。我们通过 Kaplan-Meier 分析来估计 FPD 的生存时间。所有 MC FPD 的 5 年生存率（FPD 更新的时间）为 94%；10 年生存率为 87%。28 个（4.3%）MC FPD 出现碎裂；碎裂的 5 年无事件生存率为 95%，10 年为 94%。可能的危险因素对碎裂或贴面失败没有统计学意义的影响。MC 碎裂的第一年的年危险率为 0.03，即 100 人年中有 3 人出现碎裂。接下来 6 年的年危险率降至 0.009、0.003、0.007、0.004、0.005 和 0.007。因此，大约 3-9 人在 1000 人年的暴露中出现碎裂。MC FPD 的患者可能会对其修复体有很长的生存率。在第一年，碎裂的风险可能高于接下来的几年。尽管 MC FPD 已有很长的使用经验，但仍会发生贴面碎裂。
