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首页> 外文期刊>The Journal of Prosthetic Dentistry >Estimating long-term survival of densely sintered alumina crowns: a cohort study over 10 years.
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Estimating long-term survival of densely sintered alumina crowns: a cohort study over 10 years.

机译：估算致密烧结氧化铝冠的长期生存：一项为期10年的队列研究。

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STATEMENT OF PROBLEM: Alumina-core crowns have become a standard treatment option in contemporary dental practice. The short-term survival of alumina crowns has been well documented. However, there is still a paucity of long-term survival data. PURPOSE: The purpose of this prospective cohort study was to estimate long-term survival of alumina crowns in anterior and posterior areas over an observation period of up to 10 years. MATERIAL AND METHODS: Between 1997 and 2005, 155 alumina crowns were placed in 50 subjects. Clinical and technical parameters were assessed at baseline. In 2005 and 2008, the crowns were clinically assessed using modified U.S. Public Health Service (USPHS) guidelines. Treatment failure was defined as crown or tooth loss and separated into technical or biological failures. Survival probabilities were estimated using the Kaplan-Meier method. RESULTS: In 2008, 29 subjects with 112 alumina crowns, including 86 (77%) posterior and 26 (23%) anterior crowns, were available for clinical assessment. The average observation period for these subjects was 7.8 years, with a range from 3 to 10.7 years. In total, 3 technical and 8 biological failures were observed. The estimated survival probability considering technical failures only was 95% (95% Confidence Interval (CI), 89% to 100%). The estimated overall survival probability after 10 years was 84% (95% CI, 74% to 95%). There was no significant difference in treatment failures in posterior as compared to anterior crowns (all failures: P=.713; technical failures: P=.352). CONCLUSIONS: The results suggest that the expected 10-year survival rate of alumina crowns due to technical failures is 95% (95% CI, 89% to 100%).
机译：问题陈述：氧化铝芯冠已成为当代牙科实践中的标准治疗选择。氧化铝冠的短期生存已被充分证明。但是，仍然缺乏长期生存数据。目的：这项前瞻性队列研究的目的是评估在长达10年的观察期内，氧化铝冠在前后区域的长期存活。材料与方法：1997年至2005年，在50位受试者中放置了155个氧化铝冠。在基线时评估临床和技术参数。在2005年和2008年，根据修改后的美国公共卫生服务（USPHS）指南对冠进行了临床评估。治疗失败定义为牙冠或牙齿脱落，并分为技术或生物学失败。使用Kaplan-Meier方法估计生存率。结果：在2008年，有29位氧化铝冠​​冠的受试者可供临床评估，其中包括86个冠冠（77％）和后冠冠26个（23％）。这些受试者的平均观察期为7.8年，范围为3至10.7年。总共观察到3个技术故障和8个生物学故障。仅考虑技术故障的估计生存概率为95％（置信区间（CI）为95％，从89％到100％）。 10年后的估计总体生存概率为84％（95％CI，74％至95％）。与前牙冠相比，后牙治疗失败没有显着差异（所有失败：P = .713;技术失败：P = .352）。结论：结果表明，由于技术故障，氧化铝冠的预期10年生存率是95％（95％CI，89％至100％）。

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