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International Poster Journal of Dentistry and Oral Medicine



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Int Poster J Dent Oral Med 14 (2012), No. 4     15. Dec. 2012

Int Poster J Dent Oral Med 2012, Vol 14 No 4, Poster 626

Long-term Reliabilty of Zirconia-based Fixed Partial Dentures

Language: English

Dr. med. dent. Daniel Todorovic, Prof. Dr. med. dent. Wilhelm Niedermeier,
Uniklinikum Köln, Zentrum für Zahn-, Mund-, und Kieferheilkunde, Poliklinik für Zahnärztliche Prothetik, Cologne, Germany

Deutscher Zahnärztetag
Frankfurt am Main

Poster Award
Dentsply Förderpreis der BZÄK/DGZMK


The aim of this prospective study was to evaluate the clinical performance of CERCON all-ceramic anterior and posterior fixed partial dentures (FPDs).

Material and Methods

Group of investigation:
121 patients with 236 restaurations, of which 200 crowns - 29 trinominal & 7 quadrinominal bridges

Technical properties of the restaurations:
Crown preparation with equi- or subgingival chamfer (r ~ 2.25 mm).
The frameworks were produced after corrective impression using the computerized CERCON® technique (DeguDent) and did not differ in design.
The mean thickness of core plus veneering layer CERCON Ceram Kiss® (DeguDent) was 2,0±0,5 mm.
All crowns were luted onto vital abutments using ZnO-P-cement (Harvard, Hoffman&Richter) or composite cement (BiFix, Voco, GER.) in case of non vital teeth.

Test protocol:
Occurring failures (chipping, fractures of the framework, marginal gaps etc.) were determined at half year check-ups and documented with a standardised damage report for every patient.
FPDs with major failures were excluded from further recalls.
The type of crown failure was analyzed in detail by clinical examination (occlusal checking, model analysis, photography etc.).
Data was evaluated statistically using the survival analysis by Kaplan-Meier (Logrank-Test, p = 0.05).


The mean observation period was 31±6 months.
Cercon all-ceramic restaurations demonstrated natural and esthetical apperance.
20 failures of 236 crowns and bridges occured mainly during the initial wearing period (0-4 months): 3 framework fractures, 12 chippings and 5 de-attachments
After an observation period of 71 months the overall failure rate by Kaplan-Meier was 10,2%, including 5,8 % chipping defects.
The analysis of the chipping phenomenon suggested occlusal causes like bruxism and technical deficiencies in the design of the framework.

Fig. 1: chipping of 16 (FDI) Fig. 2: chipping of the disto-buccal cusp
Fig. 3: possible avoidance of the chipping-phenomenon
Fig. 4: Kaplan-Meier-survivals (Cercon)


Zirconia demonstrated sufficient stability as framework material for crown and bridges. Comparing ceramo-metal with Cercon® all-ceramic restaurations previous studies have shown an approximately 50% higher failure rate for Zirconia crowns and bridges.


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FPD: fixed partial dentures
ZnO-P: zink-phospate-cement
etc.: et cetera
GER: Germany

This Poster was submitted by Dr. med. dent. Daniel Todorovic.

Correspondence address:
Dr. med. dent. Daniel Todorovic
Uniklinikum Köln
Zentrum für Zahn-, Mund-, und Kieferheilkunde, Poliklinik für Zahnärztliche Prothetik
Kerpener Str. 32
50931 Köln