Abstract
Statement of problem
Printing conditions can affect the fit of a 3-dimensionally (3D) printed prosthesis.
Therefore, it is important to determine the optimal printing conditions for stereolithography
(SLA)-manufactured prostheses.
Purpose
The purpose of this study was to analyze the fit according to the build orientations
and layer thicknesses in SLA-manufactured 3-unit resin prostheses.
Material and methods
SLA 3D-printed prostheses were produced in 5 build orientations (0, 30, 45, 60, and
90 degrees) and 2 layer thicknesses (50 and 100 μm). Milled prostheses were fabricated
from the same design. The mounted prostheses on the master model were scanned with
microcomputed tomography (μCT). Data were processed with the NRecon software program.
For quantitative analysis, marginal and internal fits were measured by using the imageJ
software program in terms of the following metrics: absolute marginal discrepancy,
marginal gap, cervical area, midaxial wall area, line-angle area, and occlusal area.
Internal gap volume was also measured with the CTAn software program. For statistical
analysis, ANOVA and Tukey HSD tests were used (=.05). For qualitative analysis, μCT cross-sections were compared among groups, and
intaglio surfaces were imaged with a scanning electron microscope.
Results
A layer thickness of 50 μm with build orientations of 45 and 60 degrees exhibited
smaller mean gap values (P<.05) than the other conditions for all measurements except line-angle area and occlusal
area. The scanning electron microscope images showed voids on the intaglio surfaces
for the 0- and 90-degree groups.
Conclusions
For SLA 3D-printed resin prostheses, a difference in fit occurred based on the printing
conditions, although both 3D-printed and milled prostheses showed a clinically acceptable
fit. When an SLA 3D-printed prosthesis is manufactured under appropriate conditions,
a clinically acceptable fit can be obtained.
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Article info
Publication history
Published online: January 17, 2023
Publication stage
In Press Corrected ProofFootnotes
Supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2018R1D1A1B07042333) and 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, Republic of Korea, the Ministry of Food and Drug Safety) (project number: 202011A02).
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© 2021 by the Editorial Council for The Journal of Prosthetic Dentistry.
