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Survival of 2039 complete arch fixed implant-supported zirconia prostheses: A retrospective study
Avinash S Bidra1, Michael Tischler2, Claudia Patch2
1University of Connecticut and Private Practice, Meriden, Conn.
Statement Of Problem:
Presently, data for the survival of 1-piece complete arch fixed implant-supported zirconia prostheses are limited.
Purpose:
The purpose of this retrospective study was to evaluate the survival outcomes of 1-piece complete arch fixed implant-supported zirconia prostheses fabricated by a single dental laboratory supporting several clinicians.
Material And Methods:
Outcome data were collected over a 5-year period from a large commercial dental laboratory that fabricated 2039 1-piece complete arch fixed implant-supported monolithic zirconia prostheses. All prostheses were fabricated using the same zirconia system from 1 manufacturer, using standardized protocols. The zirconia prostheses were predominantly monolithic, with veneered porcelain restricted to the gingival region. Because a 5-year warranty against fracture was offered by this dental laboratory, prostheses that were returned to the laboratory for remake because of catastrophic failure (fracture) or technical complications were identified, and data were analyzed using a life table.
Results:
Of the 2039 zirconia prostheses evaluated, at least 319 prostheses had a minimum of 3 years of clinical service, and 69 prostheses had a minimum of 4 years of clinical service. A total of 6 fractures were reported, resulting in a first-year interval survival rate of 99.8% and a 5-year cumulative survival rate of 99.3%. Six zirconia prostheses were returned to the laboratory during the 5-year period because of technical complications related to the debonding of titanium cylinders, and 3 prostheses were returned because of fracture of the titanium cylinders. No prostheses were returned because of chipping of the veneered gingival porcelain.
Conclusions:
Practice-based evidence from this large sample, short-term retrospective study showed that 1-piece complete arch fixed implant-supported zirconia prostheses with veneered porcelain restricted to the gingival region showed a cumulative survival rate of 99.3% in a 5-year period. The technical complication rate related to this type of prosthesis was minimal.
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