Abstract
Statement of problem
Recent resin-based and ceramic-based computer-aided design and computer-aided manufacturing
(CAD-CAM) materials have been used to restore endodontically treated teeth. Adaptation
of the restoration is important for clinical success, but studies evaluating the effect
of these materials on the adaptation of endocrowns are lacking.
Purpose
The purpose of this in vitro study was to evaluate the effect of resin-based and ceramic-based
materials on the marginal and internal adaptation of endocrowns.
Material and methods
Forty mandibular molars were divided into 4 groups (n=10); each group was restored
with a different CAD-CAM material: group C: hybrid nanoceramic (Cerasmart; GC Corp),
group T: fiber-composite material (Trilor; Bioloren Srl), group E: lithium disilicate
glass-ceramic (IPS e.max CAD; Ivoclar Vivadent AG), and group V: zirconia-reinforced
lithium silicate glass-ceramic (Vita Suprinity; VITA Zahnfabrik GmbH). A digital scan
was made with an intraoral digital scanner (TRIOS 3; 3Shape A/S), and endocrowns were
milled with a 5-axis milling machine (Coritec 250i; imes-icore GmbH). The replica
technique and a stereomicroscope (×70) were used to measure the marginal and internal
adaptation of the endocrowns at 32 points. All data were statistically analyzed using
1-way ANOVA and the Tukey honestly significant difference test (α=.05).
Results
Statistical tests showed significant differences among the tested groups (P<.001). The resin-based groups displayed larger discrepancies than the ceramic-based
groups. The resin-based groups showed a mean marginal gap larger than the mean internal
gap C (P=.009), T (P<.001), whereas the ceramic-based groups showed similar gaps, V (P=.396), E (P=.936). The largest gap was observed at the pulpal floor (P<.001).
Conclusions
All materials had clinically acceptable internal and marginal gaps (≤150 μm), except
for the marginal gap of the Trilor group.
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Article Info
Publication History
Published online: April 23, 2019
Footnotes
The study was supported in part by GC, Dental Products Co . Prodent and CADent Dental Laboratory provided CAD-CAM support.
Identification
Copyright
© 2018 by the Editorial Council for The Journal of Prosthetic Dentistry.
