J Adv Prosthodont.  2015 Aug;7(4):329-337. 10.4047/jap.2015.7.4.329.

Clinical outcome of double crown-retained implant overdentures with zirconia primary crowns

• Rinke S
• Buergers R
• Ziebolz D
• Roediger M

• KMID: 2118270
• DOI: http://doi.org/10.4047/jap.2015.7.4.329

Abstract

PURPOSE
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).
MATERIALS AND 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).
CONCLUSION
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.

Keyword

Clinical trial; Telescopic crown; Overdenture; Zirconia; Survival; Success

MeSH Terms

Cohort Studies
Crowns*
Denture, Overlay*
Humans
Maxilla
Peri-Implantitis
Private Practice
Retrospective Studies
Sample Size
Survival Rate

Figure

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  Fig. 1 Components of the CGDC restoration: milled and polished primary zirconia crowns, electroplated secondary crowns, and cast framework.

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  Fig. 2 (A) Adhesively luted zirconia primary crowns for a maxillary IOD retained by 4 implants, (B) Intraoral luting of the secondary crowns and the CoCr framework, (C) Basal view on the finalized removable denture, (D) Clinical situation with the CGDC-retained maxillary IOD on 4 implants.

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