Statement of problem
One-piece milled zirconia posts and cores present an esthetic option as foundation
restorations for ceramic crowns. To date, dimensional fit and load capacity of 1-piece
zirconia posts and cores have not been determined.
Purpose
The purpose of this study was to evaluate the accuracy of fit of milled zirconia posts
and cores and to compare the shear strength with other post-and-core systems.
Material and methods
Eighty-five maxillary central incisors and canines received endodontic treatment and
were divided into 5 groups (n=17) as follows: cast gold post and core (Au) as control,
1-piece milled zirconia post and core (Zr), prefabricated zirconia post with heat-pressed
ceramic core (Zr/Cer), titanium post and composite resin core (Ti), and combined fiber/zirconia
post with composite resin core (Fiber/Zr). The posts and cores were cemented with
dual-polymerized composite resin cement (Multilink). Zirconia copings were made for
each specimen, cemented, and loaded to failure. Fracture loads and modes of failure
were recorded. Fracture loads were compared with a linear model. Differences in the
mean marginal gap distance between the post-and-core patterns and the adjusted milled
zirconia posts and cores were analyzed with a paired t test (α=.05).
Results
A significant difference was found in the marginal gap distance of group Zr (P<.001), compared with the marginal gap distance of the acrylic resin patterns. Mean
loads to failure were highest for the Fiber/Zr group in comparison with custom-made
milled zirconia posts and cores (P<.001).
Conclusions
All systems evaluated presented sufficient mean load-to-failure values for anterior
tooth restorations, including the recently developed 1-piece milled zirconia post
and core. (J Prosthet Dent 2010;103:369–379)
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Article info
Footnotes
Partially funded through the Tylman Research Grant of the American Academy of Fixed Prosthodontics. Presented as a poster presentation at the Annual Meeting of the American College of Prosthodontists (ACP). Winner of the first place poster presentation award, fall meeting of the Northeast section of the ACP.
Identification
Copyright
© 2010 The Editorial Council of the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.
