Abstract
Statement of problem
Vat-polymerized casts can be designed with different bases, but the influence of the
base design on the accuracy of the casts remains unclear.
Purpose
The purpose of the present in vitro study was to evaluate the influence of various
base designs (solid, honeycombed, and hollow) with 2 different wall thicknesses (1
mm and 2 mm) on the accuracy of vat-polymerized diagnostic casts.
Material and methods
A virtual maxillary cast was obtained and used to create 3 different base designs:
solid (S group), honeycombed (HC group), and hollow (H group). The HC and H groups
were further divided into 2 subgroups based on the wall thickness of the cast designed:
1 mm (HC-1 and H-1) and 2 mm (HC-2 and H-2) (N=50, n=10). All the specimens were manufactured
with a vat-polymerized printer (Nexdent 5100) and a resin material (Nexdent Model
Ortho). The linear and 3D discrepancies between the virtual cast and each specimen
were measured with a coordinate measuring machine. Trueness was defined as the mean
of the average absolute dimensional discrepancy between the virtual cast and the AM
specimens and precision as the standard deviation of the dimensional discrepancies
between the virtual cast and the AM specimens. The Kolmogorov-Smirnov and Shapiro-Wilk
tests revealed that the data were not normally distributed. The data were analyzed
with Kruskal-Wallis and Mann-Whitney U pairwise comparison tests (α=.05).
Results
The trueness ranged from 63.73 μm to 77.17 μm, and the precision ranged from 44.00
μm to 54.24 μm. The Kruskal-Wallis test revealed significant differences on the x-
(P<.001), y- (P=.006), and z-axes (P<.001) and on the 3D discrepancy (P<.001). On the x-axis, the Mann-Whitney test revealed significant differences between
the S and H-1 groups (P<.001), S and H-2 groups (P<.001), HC-1 and H-1 groups (P<.001), HC-1 and H-2 groups (P<.001), HC-2 and H-1 groups (P<.001), and HC-2 and H-2 groups (P<.001); on the y-axis, between the S and H-1 groups (P<.001), HC-1 and H-1 groups (P=.001), HC-1 and H-2 groups (P=.02), HC-2 and H-1 groups (P<.001), HC-2 and H-2 groups (P=.003); and on the z-axis, between the S and H-1 groups (P=.003). For the 3D discrepancy analysis, significant differences were found between
the S and H-1 groups (P<.001), S and H-2 groups (P=.004), HC-1 and H-1 groups (P=.04), and HC-2 and H-1 groups (P=.002).
Conclusions
The base designs tested influenced the manufacturing accuracy of the diagnostic casts
fabricated with a vat-polymerization printer, with the solid and honeycombed bases
providing the greatest accuracy. However, all the specimens were clinically acceptable.
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Article info
Publication history
Published online: June 09, 2021
Footnotes
This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
Identification
Copyright
© 2021 by the Editorial Council for the Journal of Prosthetic Dentistry.
