Clinical performance of non-precious metal double crowns with friction pins in severely reduced dentitions
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ORIGINAL ARTICLE
Clinical performance of non-precious metal double crowns with friction pins in severely reduced dentitions Sebastian Hinz 1 & Ramona Schweyen 1
&
Jeremias Hey 1 & Juergen Setz 1 & Christin Arnold 1
Received: 18 February 2019 / Accepted: 24 January 2020 # The Author(s) 2020
Abstract Objectives 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). Materials and methods 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. Results 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. Conclusions 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. Clinical relevance 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. Keywords Partial denture . Double crowns . Friction pins . Survival rate . Severely reduced dentition
Introduction Double crowns are characterized as a universal attachment that combines various functions, such as support, retention, non-tilt, and shear interlock. As rigid attachments, they transmit all loads (axial, horizontal, and torque) directly to the abutment teeth [1–3]. Different types of double crowns are used for the retention of partial dentures in different countries [1, 4–9]. In addition, cases with significantly reduced residual dentitions and an unfavorable distribution of supporting teeth
* Ramona Schweyen [email protected] 1
Department of Prosthetic Dentistry, University School of Dental Medicine, Martin-Luther-University Halle-Wittenberg, Magdeburger Str. 16, 06112 Halle, Germany
have shown high survival rates using double crown systems, suggesting that prosthetic rehabilitation with double crowns can be used in patients with an unfavorable distribution of remaining teeth [10, 11]. Severely reduced dentition (SRD)
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