Abstract
Statement of problem
Two novel restorative materials, a polymer infiltrated ceramic network (PICN) and
a resin nanoceramic (RNC), for computer-assisted design and computer-assisted manufacturing
(CAD-CAM) applications have recently become commercially available. Little independent
evidence regarding their mechanical properties exists to facilitate material selection.
Purpose
The purpose of this in vitro study was to measure the edge chipping resistance and
flexural strength of the PICN and RNC materials and compare them with 2 commonly used
feldspathic ceramic (FC) and leucite reinforced glass-ceramic (LRGC) CAD-CAM materials
that share the same clinical indications.
Material and methods
PICN, RNC, FC, and LRGC material specimens were obtained by sectioning commercially
available CAD-CAM blocks. Edge chipping test specimens (n=20/material) were adhesively
attached to a resin substrate before testing. Edge chips were produced using a 120-degree,
sharp, conical diamond indenter mounted on a universal testing machine and positioned
0.1 to 0.7 mm horizontally from the specimen’s edge. The chipping force was plotted
against distance to the edge, and the data were fitted to linear and quadratic equations.
One-way ANOVA determined intergroup differences (α=.05) in edge chipping toughness.
Beam specimens (n=22/material) were tested for determining flexural strength using
a 3-point bend test. Weibull statistics determined intergroup differences (α=.05).
Flexural modulus and work of fracture were also calculated, and 1-way ANOVA determined
intergroup differences (α=.05)
Results
Significant (P<.05) differences were found among the 4 CAD-CAM materials for the 4 mechanical properties.
Specifically, the material rankings were edge chipping toughness: RNC>LRGC=FC>PICN;
flexural strength: RNC=LRGC>PICN>FC; flexural modulus: RNC<PICN<LRGC<FC; and work
of fracture: RNC>LRGC=PICN>FC.
Conclusions
The RNC material demonstrated superior performance for the mechanical properties tested
compared with the other 3 materials.
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Article info
Publication history
Published online: May 05, 2016
Footnotes
Supported by an American Academy of Fixed Prosthodontics Stanley D. Tylman Research Grant.
Identification
Copyright
Copyright © 2016 by the Editorial Council for The Journal of Prosthetic Dentistry.
