Abstract
Statement of problem
Print orientation may affect the manufacturing accuracy of vat-polymerized diagnostic
casts. However, its influence should be analyzed based on the manufacturing trinomial
(technology, printer, and material) and printing protocol used to manufacture the
casts.
Purpose
The purpose of this in vitro study was to measure the influence of different print
orientations on the manufacturing accuracy of vat-polymerized polymer diagnostic casts.
Material and methods
A standard tessellation language (STL) reference file containing a maxillary virtual
cast was used to manufacture all specimens using a vat-polymerization daylight polymer
printer (Photon mono SE. LCD 2K) and a model resin (Phrozen Aqua Gray 4K). All specimens
were manufactured using the same printing parameters, except for print orientation.
Five groups were created depending on the print orientation: 0, 22.5, 45, 67.5, and
90 degrees (n=10). Each specimen was digitized using a desktop scanner. The discrepancy
between the reference file and each of the digitized printed casts was measured using
the Euclidean measurements and root mean square (RMS) error (Geomagic Wrap v.2017).
Independent (unpaired) sample t tests and multiple pairwise comparisons using the Bonferroni test were used to analyze
the trueness of the Euclidean distances and RMS data. Precision was assessed using
the Levene test (α=.05).
Results
In terms of Euclidean measurements, significant differences in trueness and precision
values were found among the groups tested (P<.001). The 22.5- and 45-degree groups resulted in the best trueness values, and the
67.5-degree group had the lowest trueness value. The 0- and 90-degree groups led to
the best precision values, while the 22.5-, 45-, and 67.5-degree groups showed the
lowest precision values. Analyzing the RMS error calculations, significant differences
in trueness and precision values were found among the groups tested (P<.001). The 22.5-degree group had the best trueness value, and the 90-degree group
resulted in the lowest trueness value among the groups. The 67.5-degree group led
to the best precision value, and the 90-degree group to the lowest precision value
among the groups.
Conclusions
Print orientation influenced the accuracy of diagnostic casts fabricated by using
the selected printer and material. However, all specimens had clinically acceptable
manufacturing accuracy ranging between 92 μm and 131 μm.
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Article info
Publication history
Published online: March 09, 2023
Publication stage
In Press Corrected ProofIdentification
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© 2023 by the Editorial Council for The Journal of Prosthetic Dentistry.
