Abstract
Statement of problem
The mechanical properties of zirconia suggest that it might serve as a material for
abutment crowns for partial removable dental prostheses (RDPs). Only limited clinical
evidence is available for the use of ceramics as abutment crowns.
Purpose
The purpose of this retrospective clinical study was to evaluate the outcome of veneered
zirconia single crowns in abutment teeth for RPDs in participants treated by predoctoral
students.
Material and methods
Thirty-seven veneered zirconia single crowns in 17 participants (9 men and 8 women;
mean age 62.5 years) were prepared as abutment teeth for a clasp-retained RDP with
a metal framework: 22 crowns with an occlusal rest seat and 15 crowns with both an
occlusal rest seat and retentive clasps. The mean follow-up time was 4.2 years (2.9
to 5.4 years). In a clinical examination, the anatomic form of the crown, marginal
fidelity (the border between the crown and the tooth was felt with an explorer), wear
of the ceramic surface in the rest seat, and fracture of the veneering porcelain were
examined and assessed as good, acceptable, or unacceptable. The retention and stability
of the RDPs were recorded as good, moderate, or poor.
Results
The complications found were fracture of the veneering porcelain (11%) and fracture
of the occlusal rest seat (3%). Wear of porcelain at the occlusal contact point was
found in 24% of the zirconia single crowns. Wear of the ceramic surfaces of the rest
seats for the RDPs was not found. The retention was good in all RDPs. The stability
was good in 73% and moderate in 23% of the RDPs.
Conclusions
Veneered zirconia single crowns are suitable in abutment teeth for RDPs with a metal
framework. Fracture in the veneering porcelain remains a problem with veneered zirconia,
although the zirconia surface in the rest seats for RDPs showed no wear.
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Article info
Publication history
Published online: September 05, 2015
Identification
Copyright
© 2015 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.
