Department of Prosthetic Dentistry, University School of Dental Medicine, Martin-Luther-University Halle-Wittenberg, Magdeburger Str. 16, 06112, Halle, Germany.
Clin Oral Investig. 2020 Oct;24(10):3567-3575. doi: 10.1007/s00784-020-03228-1. Epub 2020 Feb 1.
Several in vitro studies have investigated the retention of double crowns with friction pins (DCP); however, clinical data on their long-term success have not been reported. We sought to evaluate the 5-year survival rate of DCPs in patients with severely reduced dentition (SRD) and not severely reduced dentition (NSRD).
A total of 158 patients were treated with 182 dentures on 520 abutment teeth between 2006 and 2016. The SRD group included 144 dentures that had been inserted on 314 abutment teeth. We evaluated the influence of age, sex, jaw, number, tooth vitality, and abutment teeth localization (according to Steffel's classification) on the 60-month survival rates of dentures and abutment teeth using the Kaplan-Meier estimator, logrank test, and Cox regression.
The cumulative 60-month survival rate was 84.3% (CI 77.1-91.5%) for all dentures; however, the survival rate in the SRD group (80.3%; CI 71.5-89.1%) was significantly lower than in the NSRD group (100%; p = 0.04). Dentures classified in Steffel's class A had the lowest survival rate (51.5%; CI 30.9-72.1%). Number, location, and vitality of the abutment teeth had a significant impact on survival rate.
DCP dentures showed comparable clinical long-term success to double crown systems that have been previously reported in the literature. The number, localization, and vitality of abutment teeth had the greatest influence on the survival rates of denture and abutment teeth.
DCP dentures have an acceptable 5-year survival rate. Clinical treatment planning must take into account key factors associated with the prognosis of the abutment teeth.
已有多项体外研究调查了带摩擦栓的双重冠（DCP）的固位情况；然而，其长期临床成功率尚未见报道。本研究旨在评估严重牙列缺损（SRD）和非严重牙列缺损（NSRD）患者使用 DCP 的 5 年生存率。
2006 年至 2016 年期间，共有 158 名患者的 520 个基牙上佩戴了 182 个义齿。SRD 组包括 144 个义齿，共植入 314 个基牙。我们采用 Kaplan-Meier 估计法、对数秩检验和 Cox 回归分析评估年龄、性别、颌骨、基牙数量、牙齿活力以及基牙定位（Steffel 分类）对义齿和基牙 60 个月生存率的影响。
所有义齿的累计 60 个月生存率为 84.3%（95%CI 77.1%-91.5%），但 SRD 组（80.3%，95%CI 71.5%-89.1%）的生存率明显低于 NSRD 组（100%，p=0.04）。Steffel 分类 A 级的义齿生存率最低（51.5%，95%CI 30.9%-72.1%）。基牙的数量、位置和活力对生存率有显著影响。
DCP 义齿的临床长期成功率与文献中先前报道的双重冠系统相当。基牙的数量、定位和活力对义齿和基牙的生存率影响最大。
DCP 义齿有可接受的 5 年生存率。临床治疗计划必须考虑与基牙预后相关的关键因素。
