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Success Rate of Two-Piece Zirconia Implants: A Retrospective Statistical Analysis
Siegfried Jank1, Gregor Hochgatterer
1*Associate Professor, Department of Oral and Cranio-maxillofacial Surgery, Medical University of Innsbruck, Innsbruck, Austria. †Resident, Department of Oral and Cranio-maxillofacial Surgery, Medical University of Innsbruck, Innsbruck, Austria.
Purpose:
About 10 years ago, one-piece zirconia implants were introduced to dentistry. The aim of the study was to evaluate the clinical success of two-piece zirconia implants regarding osseointegration using the manufacturers' warranty data.
Materials And Methods:
Over a period of 4 years (2010-2014), the data of warranty replacements of 15,255 sold Zeramex implants were evaluated retrospectively and blinded.
Results:
Three hundred forty-seven (2.2%) nonosseointegrated implants were sent back. Zeramex T showed an average success rate of 96.7%, whereas Zeralock implants exhibited an average success rate of 98.5%. Furthermore, Zeramex Plus implants exhibit an average success rate of 99.4% within the investigated period. Assuming, that 2% of the failed implants were unreturned, the above-mentioned values show no changes. Assuming 5% (10%) of unreturned nonosseointegrated implants, the average success rate of Zeramex T decreases from 96.7% to 96.6% (96.4%) and of Zeralock from 98.5% to 98.4% (98.4%), respectively. The success rate of Zeramex Plus implants remains unchanged at 99.4%.
Conclusion:
The results of this study imply that two-piece zirconia implants show competitive success rates, improved from >96.7% to >98.5% over three product generations.
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