Double-crown–retained removable dental prostheses: A retrospective study of survival and complications

• Published in: The Journal of prosthetic dentistry 2014-09, Vol.112 (3), p.488-493
• Main Authors: Schwindling, Franz Sebastian, DDS, DrMedDent, Dittmann, Britta, DDS, DrMedDent, Rammelsberg, Peter, DDS, DrMedDent, PhD
• Format: Article
• Language: English
• Subjects: Aged; Aged, 80 and over; Cementation; Crowns; Dental Abutments; Dental Prosthesis Design; Dental Restoration Failure; Dental Veneers; Dentistry; Denture Bases; Denture Rebasing; Denture Retention; Denture, Complete; Denture, Overlay; Denture, Partial, Removable; Female; Follow-Up Studies; Humans; Male; Middle Aged; Retrospective Studies; Survival Analysis; Treatment Outcome
• ISSN: 0022-3913; 1097-6841
• DOI: 10.1016/j.prosdent.2014.02.017

Statement of problem Research data are scarce on double-crown–retained removable dental prostheses. In double-crown–retained removable dental prostheses, crown-like copings are definitively cemented to the abutment teeth and serve as prosthesis attachments. Purpose The purpose of this study was to evaluate the survival of double-crown–retained removable dental prostheses in use for 7 years and to determine their most common complications. Material and methods A retrospective analysis was conducted to investigate the clinical outcome of 117 prostheses in 86 patients with 385 abutment teeth. Thirty-two telescopic-crown–retained removable dental prostheses, 51 conical-crown–retained removable dental prostheses, and 34 resilient telescopic-crown–retained overdentures were clinically reexamined by 1 investigator. Prosthesis success was defined as survival without severe complications (abutment tooth extraction). Statistical analyses were performed with Kaplan-Meier modeling and Cox regression (α=.05). Results Minor complications, for example, the decementation of primary crowns (34.2%), failure of the veneer of secondary crowns (11.1%), fracture of the denture base (17.1%), and the need for relining (12%), were common. Cumulative prosthesis survival for all types of prostheses was 93.8% after 7 years. After the same period, prosthesis success was 90% for telescopic-crown–retained removable dental prostheses and 78.5% for conical-crown–retained removable dental prostheses and resilient telescopic-crown–retained overdentures. Conclusions The medium-term double-crown–retained removable dental prosthesis survival found in this retrospective investigation appears acceptable. When bearing in mind the limits of this study, this kind of prosthesis might be a viable treatment option for patients with a reduced dentition. However, more laboratory and clinical research is necessary to reduce the incidence of minor complications and confirm the present in vivo results in larger patient groups.