Clinical outcome of double crown-retained implant overdentures with zirconia primary crowns.
OBJECTIVE
This retrospective study aims at the evaluation of implant-supported overdentures (IODs) supported by ceramo-galvanic double crowns (CGDCs: zirconia primary crowns + galvano-formed secondary crown).


METHODS
In a private practice, 14 patients were restored with 18 IODs (mandible: 11, maxilla: 7) retained by CGDCs on 4 - 8 implants and annually evaluated for technical and/or biological failures/complications.


RESULTS
One of the 86 inserted implants failed during the healing period (cumulative survival rate (CSR) implants: 98.8%). During the prosthetic functional period (mean: 5.9 ± 2.2 years), 1 implant demonstrated an abutment fracture (CSR-abutments: 98.2%), and one case of peri-implantitis was detected. All IODs remained in function (CSR-denture: 100%). A total of 15 technical complications required interventions to maintain function (technical complication rate: 0.178 treatments/patients/year).


CONCLUSIONS
Considering the small sample size, the use of CGDCs for the attachment of IODs is possible without an increased risk of technical complications. However, for a final evaluation, results from a larger cohort are required.
Dental Practice, Hanau, Germany. ; Department of Prosthetics, University Medical Center Göttingen, Göttingen, Germany.
Sven
S
Rinke
Department of Prosthetics, University Medical Center Göttingen, Göttingen, Germany.
Ralf
R
Buergers
Department of Cariology, Endodontology and Periodontology, University of Leipzig, Leipzig, Germany.
Dirk
D
Ziebolz
Department of Prosthetics, University Medical Center Göttingen, Göttingen, Germany.
Matthias
M
Roediger
Clinical trial; Overdenture; Success; Survival; Telescopic crown; Zirconia