Ten-year clinical performance of non-precious metal double crowns with friction pins in severely reduced dentitions—a retrospective study

• Published in: Clinical oral investigations 2023-04, Vol.27 (4), p.1623-1635
• Main Authors: Hinz, Sebastian, Bömicke, Wolfgang, Schweyen, Ramona, Bensel, Tobias
• Format: Article
• Language: English
• Subjects: Crowns; Data collection; Dental Abutments; Dentistry; Dentition; Denture, Partial, Removable; Dentures; Female; Follow-Up Studies; Friction; Humans; Investigations; Jaw; Male; Medicine; Metals; Patient satisfaction; Precious metals; Prostheses; Prosthetics; Prosthodontics; Retention; Retrospective Studies; Risk factors; Teeth; Transplants & implants
• ISSN: 1436-3771; 1432-6981; 1436-3771
• DOI: 10.1007/s00784-022-04788-0

Objectives This follow-up study aimed at collecting long-term data for removable partial dentures (RPDs) retained by double crowns with spark-eroded friction pins (DCP) and comparing them in the presence of severely reduced dentition (SRD) and non-SRD (NSRD, i.e. residual dentition with more than three abutment teeth) after a 10-year wearing period. Materials and methods A total of 158 participants ( n  = 71, 44.9% women) aged 62.5 ± 12.7 years with 182 prostheses on 520 abutment teeth were followed up between 2006 and 2022. The SRD group included 144 RPDs supported by 314 abutment teeth. The data collection was performed retrospectively. 10-year survival rates of RPDs and abutment teeth were determined using the Kaplan–Meier method and compared using the log-rank test for SRD and NSRD, among others. Cox regression analyses were conducted to isolate risk factors for the survival of both RPDs and abutment teeth. Results The 10-year cumulative survival rate of all abutment teeth was 65.6% with significantly lower values in the SRD group (53.5%) ( p