Abstract
Statement of problem
The selection of an appropriate restorative material based on fracture behavior is
important for the marginal integrity of a dental restoration. For computer-aided design
and computer-aided manufacturing (CAD-CAM) restorative materials, information regarding
their edge chipping resistance is scarce.
Purpose
The purpose of this in vitro study was to determine the edge chipping resistance (ECR)
and Martens hardness (HM) of 6 different dental CAD-CAM restorative materials before
and after thermocycling.
Material and methods
Four composite resin materials including Brilliant Crios; Cerasmart, an experimental
material; Lava Ultimate, a polymer-infiltrated ceramic-network (PICN) material (VITA
Enamic), and a glass-ceramic control (IPS Empress CAD) were tested. The specimens
were tested before and after thermocycling (30 000 times, 5 °C/55 °C). The ECR was
measured for each material (n=25) and related to the point of loading and to the maximum
chipping depth. HM was determined for each material (n=25). The Kruskal-Wallis and
Mann-Whitney U tests were used to compare materials (α=.05). The impact of thermocycling
was analyzed by using the Wilcoxon test (α=.05). The correlations between all parameters
were calculated by using the Spearman-Rho test (α=.05). For fractographic analysis
of chip patterns, chipped surfaces were analyzed by laser scanning microscopy.
Results
For ECR and HM, the materials showed different values. ECRmd and ECRpl showed a positive correlation, but both showed a negative correlation to HM. The
materials showed a different chip size (P<.001). Chip patterns revealed brittle material behavior in all cases.
Conclusions
All tested CAD-CAM materials behaved as brittle materials, but HM and ECR differed
among the materials. The control glass-ceramic material showed the highest values
for HM, followed by the PICN material. ECR values revealed the opposite order of materials,
with the highest for composite resins. Artificial aging by thermocycling affected
all dental CAD-CAM restorative materials. Especially for composite resin materials,
ECR changed after aging.
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Article info
Publication history
Published online: February 27, 2020
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© 2020 by the Editorial Council for The Journal of Prosthetic Dentistry.
