Statement of problem
Implant-supported, porcelain veneered restorations experience a greater rate of porcelain
fracture than tooth-supported restorations. For completely edentulous patients, one
approach to minimizing porcelain fracture is to use acrylic resin in the mandible,
although its efficacy is unknown.
Purpose
The purpose of this study was to evaluate the reliability of a veneering porcelain
fatigued with different restorative materials in vitro.
Material and methods
Fifty-nine veneering porcelain disk specimens were fabricated by layering veneering
porcelain on nickel-chromium base metal alloy disks. Four groups of different indenter
materials fatigued the porcelain specimens: group WC, tungsten carbide served as a
control; group FC, pressed leucite glass ceramic; group NHC, nanohybrid composite
resin denture tooth; and group AR, unfilled acrylic resin denture tooth. Porcelain
specimens were randomly divided into 4 groups (n=14). A step-stress accelerated life-testing
model was used. Use-level probability Weibull plots were generated, and the reliability
of each group was estimated for a theoretical completion of 50 000 cycles at 150 N.
Results
Nanohybrid composite resin and unfilled acrylic resin denture tooth groups had higher
reliability than tungsten carbide and leucite glass ceramic groups. No significant
differences existed between the reliability of the tungsten carbide and leucite glass
ceramic groups and the nanohybrid composite resin and acrylic resin denture tooth
groups.
Conclusions
Veneering porcelain disk specimens fatigued with the unfilled acrylic resin and nanohybrid
composite resin denture tooth indenters exhibited higher reliability than the specimens
fatigued with either the tungsten carbide or leucite glass ceramic indenters. All
of the veneering porcelain disk specimens failed with the same mode of fracture, although
the surface posttest exhibited different fracture characteristics among specimens
fatigued with the 4 different materials.
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Article info
Publication history
Published online: November 04, 2013
Footnotes
Supported by a Stanley D. Tylman Research Grant from the American Academy of Fixed Prosthodontics.
First place, 2012 Tylman Award Program, American Academy of Fixed Prosthodontics.
Identification
Copyright
© 2013 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.
