Abstract
Statement of problem
The digital scanning technique has been introduced as an alternative to the conventional
impression technique for the fabrication of fixed restorations. However, adequate
information is not available on the efficacy of digital scanning for the fabrication
of endocrowns regarding their marginal accuracy.
Purpose
The purpose of this in vitro study was to compare the marginal gap of endocrowns fabricated
by computer-aided design and computer-aided manufacturing (CAD-CAM) technology and
digital scanning and conventional impression techniques.
Material and methods
An endodontically treated mandibular molar tooth was prepared to receive an endocrown.
The impressions were made by using the conventional impression technique with polyvinyl
siloxane material (n=11) and digital scanning by using an intraoral scanner (n=11).
Endocrowns were fabricated from monolithic zirconia blocks by using a milling machine.
Each restoration was seated on the prepared tooth, and the marginal gap was measured
by using a video measuring machine at 8 points under magnification. The mean marginal
gap for each restoration and the overall mean marginal gap for each group were calculated.
Data were analyzed by using a statistical software program. Marginal gaps were compared
with the Mann-Whitney U test (α=.05).
Results
The mean marginal gap was 74 μm for the conventional impression group. A similar mean
marginal gap (70 μm) was found for the digital scanning group. No statistically significant
difference was found between the groups (P=.375).
Conclusions
The digital scanning technique and the conventional impression technique yielded crowns
with comparable marginal adaptation.
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Article info
Publication history
Published online: November 13, 2020
Footnotes
Supported by Dental Sciences Research Center of Guilan University of Medical Sciences (grant number: IR.GUMS.REC.1397.416).
Identification
Copyright
© 2020 by the Editorial Council for the Journal of Prosthetic Dentistry.
