Available online 23 April 2019
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.
Comments