Tooth-implant-supported posterior fixed dental prostheses with zirconia frameworks: 3-year clinical result
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Abstract
Objectives
This case series
compared the clinical survival of tooth-implant-supported (TI-S) and
tooth-supported (T-S) three-unit fixed dental prostheses (FDPs) with
zirconia frameworks and described the incidence of biological and
technical complications.
Materials and methods
Forty-four patients
received 27 TI-S FDPs and 22 T-S FDPs. Twenty-seven titanium screw
implants were inserted at the dislodged position of two missing
posterior teeth. All implants were provided with customized zirconia
abutments. Zirconia frameworks were fabricated by a CAD/CAM system and
veneered in powder build-up technique. All restorations were cemented
with glass ionomer. Baseline evaluation was performed 2 weeks after
cementation with recall examinations performed at 6, 12, 24 and
36 months by calibrated investigators. Survival probabilities according
to Kaplan-Meier were calculated. Gingival parameters and bone loss were
assessed and statistically evaluated.
Results
The mean service
time of the FDPs was 35 months (±6). Two technical complications
(fracture of veneering porcelain) were observed. One biological
complication was recorded. The Kaplan-Meier survival probability was
93.9 % for all types of complications and 100 % related to restorations
in service. The type of abutment support (TI-S vs. T-S) had no
significant influence on the survival probability (p = 0.412, log rank test). No difference of the gingival parameters was detected between implants and natural teeth.
Conclusions
Tooth-implant-supported zirconia-based FDPs showed similar clinical performance compared to tooth-supported zirconia-based FDPs.
Clinical relevance
Within the
limitations of this case series, tooth-implant-supported FDPs with
zirconia frameworks seem to be a reliable treatment option.
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