Abstract
Statement of problem
Vat-polymerization tilting stereolithography (TSLA) technology can be selected for
fabricating definitive crowns; however, how the printing variables, including print
orientation, influence its manufacturing accuracy remains unclear.
Purpose
The purpose of this in vitro study was to assess the influence of different print
orientations (0, 45, 75, or 90 degrees) on the intaglio surface accuracy (trueness
and precision) of TSLA definitive resin-ceramic crowns.
Material and methods
The virtual design of an anatomic contour molar crown was obtained in standard tessellation
language (STL) file format and used to manufacture all the specimens by using a TSLA
printer (DFAB Chairside) and a resin-ceramic material (Irix Max Photoshade single-use
cartridges). Four groups were created depending on the print orientation used to manufacture
the specimens: 0- (Group 0), 45- (Group 45), 70- (Group 75), and 90-degree (Group
90) print orientation (n=30). Each specimen was digitized by using a laboratory scanner
(T710) according to the manufacturer’s scanning protocol. The reference STL file was
used as a control to measure the volumetric discrepancies of the intaglio surface
with the digitized specimens by using the root mean square (RMS) error calculation.
The trueness data were analyzed by using 1-way ANOVA followed by post hoc pairwise
multiple comparison Tukey tests, and precision data were analyzed using the Levene
test (α=.05).
Results
Significant mean trueness (P<.001) and precision (P<.001) value discrepancies were found among the groups tested. Additionally, all the
groups were significantly different from each other (P<.001), except for the 45- and 90-degree groups (P=.868). Group 0 showed the best mean trueness and precision values, while the Group
90 demonstrated the lowest mean trueness and precision values.
Conclusions
The print orientations tested influenced the intaglio surface trueness and precision
values of the TSLA definitive resin-ceramic crowns.
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Article info
Publication history
Published online: April 25, 2023
Publication stage
In Press Corrected ProofFootnotes
Funding: This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
Identification
Copyright
© 2023 by the Editorial Council for The Journal of Prosthetic Dentistry.
