Abstract
Statement of problem
The carbon digital light synthesis (DLS) or continuous liquid interface production
(CLIP) technology is an innovative additive manufacturing technology using oxygen-inhibited
photopolymerization to create a continuous liquid interface of unpolymerized resin
between the growing component and the exposure window. This interface eliminates the
need for an incremental layer-by-layer approach, allowing for continuous creation
and increased printing speed. However, the internal and marginal discrepancies associated
with this new technology remain unclear.
Purpose
The purpose of this in vitro study was to evaluate the marginal and internal discrepancies
by using the silicone replica technique of interim crowns fabricated by 3 different
manufacturing technologies: direct light processing (DLP), DLS, and milling.
Material and methods
A mandibular first molar was prepared, and a crown was designed with a computer-aided
design (CAD) software program. The standard tessellation language (STL) file was used
to create 30 crowns from the DLP, DLS, milling technologies (n=10). The gap discrepancy
was determined using the silicone replica approach, with 50 measurements made with
a ×70 microscope for each specimen for the marginal and internal gaps. The data were
analyzed using 1-way ANOVA, followed by the Tukey HSD post hoc test (α=.05).
Results
The DLS group had the least marginal discrepancy compared with the DLP and milling
groups (P<.001). The DLP group showed the highest internal discrepancy followed by the DLS
and milling groups (P=.038). No significant difference was found between DLS and milling in terms of internal
discrepancy (P>.05).
Conclusions
The manufacturing technique had a significant effect on both internal and marginal
discrepancies. The DLS technology showed the smallest marginal discrepancies.
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Article info
Publication history
Published online: May 18, 2023
Publication stage
In Press Corrected ProofFootnotes
Funding: This research did not receive any specific grant from funding agencies in the public, commercial, or nonprofit sectors.
Identification
Copyright
© 2023 by the Editorial Council for The Journal of Prosthetic Dentistry.
