Abstract
Statement of problem
The layer thickness serves as a straightforward and controllable parameter to alter
the mechanical properties of 3D-printed custom trays. However, how the printing layer
thickness affects the mechanical properties of the trays is not fully understood.
Purpose
The purpose of this in vitro study was to investigate the effects and their underlying
mechanisms and to optimize the mechanical properties through modulation of the printing
layer thickness.
Material and methods
Polylactic acid (PLA) specimens were 3D-printed with 5 layer thicknesses from 0.1
mm to 0.5 mm. The bond, flexural, and tensile strengths were measured by using a universal
test machine. Postfracture interfaces were examined by means of scanning electron
microscopy. Additionally, the printing dimensional accuracy was estimated by measuring
the size deviations between the printed and virtual specimens, and the printing times
were recorded.
Results
With increasing PLA printing layer thickness, the tensile bond strength first increased
and then decreased, peaking at a thickness of 0.4 mm. While the flexural and tensile
strengths decreased, the printing dimensional accuracy remained constant from 0.1
mm to 0.4 mm and then decreased at 0.5 mm. The printing time sharply decreased as
printing layer thickness increased.
Conclusions
Moderate layer thickness provided the best properties for 3D-printed custom trays.
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Article info
Publication history
Published online: December 02, 2020
Footnotes
Supported by the Capital’s Funds for Health Improvement and Research (grant number: 2018-2-4102).
Identification
Copyright
© 2020 by the Editorial Council for the Journal of Prosthetic Dentistry.
