Abstract
Statement of problem
The cement gap setting affects the marginal and internal fits depending on the crown
material and manufacturing method (subtractive or additive manufacturing). However,
information on the effects of cement space settings in the computer-aided design (CAD)
software program, which is used to aid the manufacturing with 3-dimensional (3D) printing-type
resin material, is lacking, and recommendations for optimal marginal and internal
fit are needed.
Purpose
The purpose of this in vitro study was to evaluate how cement gap settings affect
the marginal and internal fit of a 3D-printed definitive resin crown.
Material and methods
After scanning a prepared typodont left maxillary first molar, a crown was designed
with cement spaces of 35, 50, 70, and 100 μm by using a CAD software program. A total
of 14 specimens per group were 3D printed from definitive 3D-printing resin. By using
the replica technique, the intaglio surface of the crown was duplicated, and the duplicated
specimen was sectioned in the buccolingual and mesiodistal directions. Statistical
analyses were performed using the Kruskal–Wallis and the Mann–Whitney post hoc tests
(α=.05).
Results
Although the median values of the marginal gaps were within the clinically acceptable
limit (<120 μm) for all the groups, the smallest marginal gaps were obtained with
the 70-μm setting. For the axial gaps, there was no observed difference in the 35-,
50-, and 70-μm groups, and the 100-μm group showed the largest gap. The smallest axio-occlusal
and occlusal gaps were obtained with the 70-μm setting.
Conclusions
Based on the findings of this in vitro study, a 70-μm cement gap setting is recommended
for optimal marginal and internal fit of 3D-printed resin crowns.
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Article info
Publication history
Published online: May 16, 2023
Publication stage
In Press Corrected ProofFootnotes
Funding: Supported by the Korea Medical Device Development Fund grant, funded by the Korea government (the Ministry of Science and ICT, the Ministry of Trade, Industry, and Energy, the Ministry of Health & Welfare, the Ministry of Food and Drug Safety) [project 1711174420,RS-2020-KD000260].
H.S. and Y-J.K. contributed equally to this article.
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© 2023 by the Editorial Council for The Journal of Prosthetic Dentistry.
