Abstract：
Even if survival of post and core (PC) itself was frequently investigated in recent literature, clinical data concerning the risk for extraction of teeth restored with PC is still scarce. Since most authors found the loss of retention of refitable post and cores as the most common cause of failure, it is impossible to draw a conclusion on tooth survival on the results of those studies. Therefore, the aim of the present study was to improve the clinical evidence on the survival of teeth treated with post and cores on a large number of cases over a long observation period.
735 patients were treated with 1053 post and cores in the observation period (2004-2022) and could be included in the study. The patient files were analysed due to the parameters: Type of covering prosthetic restoration, location, type of tooth, luting material, post and core material, bone attachment and therapist. The survival probability was assessed using Kaplan-Meyer analysis. Cox regression was used to assess possible multifactorial influences.
The overall average survival time until necessary extraction of a tooth restored with a post and core was 11.74 years. A root fracture in primary crown retained removeable partial dentures (RPDs) during the first five years was the most common reason for extraction in this study. A significant influence on the survival time of teeth restored with post and cores was found for the type of covering restoration, bone attachment, age of the patient and post and core material.
Post and core restored teeth should be avoided as abutments for primary crown retained RPDs.
If it is inevitable to utilise post and core restored teeth for primary crown retained RPDs, post and core materials with matching mechanical properties to that of dentine should be preferred.
735 patients were treated with 1053 post and cores in the observation period (2004-2022) and could be included in the study. The patient files were analysed due to the parameters: Type of covering prosthetic restoration, location, type of tooth, luting material, post and core material, bone attachment and therapist. The survival probability was assessed using Kaplan-Meyer analysis. Cox regression was used to assess possible multifactorial influences.
The overall average survival time until necessary extraction of a tooth restored with a post and core was 11.74 years. A root fracture in primary crown retained removeable partial dentures (RPDs) during the first five years was the most common reason for extraction in this study. A significant influence on the survival time of teeth restored with post and cores was found for the type of covering restoration, bone attachment, age of the patient and post and core material.
Post and core restored teeth should be avoided as abutments for primary crown retained RPDs.
If it is inevitable to utilise post and core restored teeth for primary crown retained RPDs, post and core materials with matching mechanical properties to that of dentine should be preferred.
摘要：
目的：即使在最近的文献中经常研究postandcore(PC)本身的生存率，关于PC修复后拔牙风险的临床数据仍然很少.由于大多数作者发现可重复PC的保留丢失是最常见的故障原因，根据这些研究的结果，不可能得出牙齿存活的结论。因此,本研究的目的是在长期的观察期内，在大量病例中，改善PC治疗牙齿存活率的临床证据。
方法：735例患者在观察期间（2004-2022年）接受了1053例PC治疗，可以纳入研究。根据以下参数对患者档案进行了分析：覆盖假体修复的类型，location,牙齿的类型,luting材料,PC材料,骨附着和治疗师。使用Kaplan-Meyer分析评估生存概率。Cox回归用于评估可能的多因素影响。
结果：需要拔除PC修复牙的总平均生存时间为11.74年。在最初的五年中，主冠保留的可移除局部义齿（RPD）的根部骨折是本研究中最常见的拔除原因。发现覆盖修复的类型对PC修复的牙齿的存活时间有显着影响，骨附着,患者年龄和PC材料。
结论：PC修复的牙齿应避免作为主冠保留RPDs的基牙。
结论：如果对于主冠保留的RPDs，不可避免地要放弃PC修复的牙齿，应优选具有与牙本质相匹配的机械性能的PC材料。
方法：735例患者在观察期间（2004-2022年）接受了1053例PC治疗，可以纳入研究。根据以下参数对患者档案进行了分析：覆盖假体修复的类型，location,牙齿的类型,luting材料,PC材料,骨附着和治疗师。使用Kaplan-Meyer分析评估生存概率。Cox回归用于评估可能的多因素影响。
结果：需要拔除PC修复牙的总平均生存时间为11.74年。在最初的五年中，主冠保留的可移除局部义齿（RPD）的根部骨折是本研究中最常见的拔除原因。发现覆盖修复的类型对PC修复的牙齿的存活时间有显着影响，骨附着,患者年龄和PC材料。
结论：PC修复的牙齿应避免作为主冠保留RPDs的基牙。
结论：如果对于主冠保留的RPDs，不可避免地要放弃PC修复的牙齿，应优选具有与牙本质相匹配的机械性能的PC材料。
