Akademik Veri Yönetim Sistemi
The Journal of prosthetic dentistry, cilt.130, sa.4, 2023 (SCI-Expanded, Scopus)
Statement of problem. Three-dimensional (3D) printers are a relatively new technology, but
the degree of conversion (DC) of the resin specimens produced by using this method is
currently unknown. However, the DC of resin interim restorative materials is critical for their
biocompatibility and physical properties.
Purpose. The purpose of this in vitro study was to evaluate the DC of interim restorative materials
produced by using different 3D printer technologies and compare them with conventionally
manufactured polymethyl methacrylate.
Material and methods. Stereolithography, digital light processing, and liquid crystal display 3D
printers were used as experimental groups, and a conventional (C) method was used as the control.
Five different 3D printers (DWS Systems, Formlabs [FL], Asiga, Mega, and Vega) were included. The
3D-printed specimens were designed in a rectangular prism geometry (10×4×2.5 mm) by using a
computer-aided design software program (Materialise 3-matic) and printed with a layer thickness of
50 µm in the horizontal direction (n=15). Fourier transform infrared spectroscopy (FT-IR) spectra were
measured in 3 steps: the liquid state of the resins, after washing with 99% isopropanol, and after final
polymerization. For the C method, FT-IR spectra were assessed in 2 steps: immediately after mixing
the liquid and powder and after polymerization. Statistical analysis of the data was performed with
1-way ANOVA followed by the post hoc Tukey honestly significant difference (HSD) test (α=.05).
Results. There was no statistically significant difference in DC values between the 3D-printed
groups (P>.05). There was a statistically significant difference only between FL and the C in terms
of DC (P=.042).
Conclusions. Three-dimensionally printed interim resin materials found comparable results with
those of the C group. The DC was not affected by different 3D printing technologies.