Effect of printing direction on stress distortion of three-dimensional printed dentures using stereolithography technology

Hada, Tamaki; Kanazawa, Manabu; Iwaki, Maiko; Arakida, Toshio; Minakuchi, Shunsuke

doi:10.1016/j.jmbbm.2020.103949

Cited by 27 publications

(19 citation statements)

References 32 publications

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“…Clear photopolymer resin was chosen for this study because it was an in vitro study. We also conducted material property tests of the same materials and designs [ 38 ]. Therefore, we believe it is important to verify the accuracy using standardized materials and designs.…”

Section: Discussionmentioning

confidence: 99%

Effect of Printing Direction on the Accuracy of 3D-Printed Dentures Using Stereolithography Technology

et al. 2020

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This study evaluated the effects of the differences in the printing directions of stereolithography (SLA) three-dimensional (3D)-printed dentures on accuracy (trueness and precision). The maxillary denture was designed using computer-aided design (CAD) software with an STL file (master data) as the output. Three different printing directions (0°, 45°, and 90°) were used. Photopolymer resin was 3D-printed (n = 6/group). After scanning all dentures, the scanning data were saved/output as STL files (experimental data). For trueness, the experimental data were superimposed on the master data sets. For precision, the experimental data were selected from six dentures with three different printing directions and superimposed. The root mean square error (RMSE) and color map data were obtained using a deviation analysis. The averages of the RMSE values of trueness and precision at 0°, 45°, and 90° were statistically compared. The RMSE of trueness and precision were lowest at 45°, followed by 90°; the highest occurred at 0°. The RMSE of trueness and precision were significantly different among all printing directions (p < 0.05). The highest trueness and precision and the most favorable surface adaptation occurred when the printing direction was 45°; therefore, this may be the most effective direction for manufacturing SLA 3D-printed dentures.

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Section: Discussionmentioning

confidence: 99%

Effect of Printing Direction on the Accuracy of 3D-Printed Dentures Using Stereolithography Technology

et al. 2020

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“…Furthermore, a few studies [18][19][20][21] have reported that the mechanical properties of products manufactured using SLA and DLP 3D printers are affected by the printing directions. Shim et al [22] reported that, compared with that in the printing direction parallel to the loading direction (90 • ), the flexural strength was higher when the printing direction of the specimens was perpendicular to the loading direction (0 • ).…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Filler Contents and Printing Directions on the Mechanical Properties for Photopolymer Resins

Hada

Kanazawa

Miyamoto

et al. 2022

IJMS

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Photopolymer resins are widely used in the production of dental prostheses, but their mechanical properties require improvement. We evaluated the effects of different zirconia filler contents and printing directions on the mechanical properties of photopolymer resin. Three-dimensional (3D) printing was used to fabricate specimens using composite photopolymers with 0 (control), 3, 5, and 10 wt.% zirconia filler. Two printing directions for fabricating rectangular specimens (25 mm× 2 mm× 2 mm) and disk-shaped specimens (φ10 mm× 2 mm) were used, 0° and 90°. Three-point bending tests were performed to determine the flexural strengths and moduli of the specimens. The Vickers hardness test was performed to determine the hardness of the specimens. Tukey’s multiple comparison tests were performed on the average values of the flexural strengths, elastic moduli, and Vickers hardness after one-way ANOVA (α = 0.05). The flexural strengths and elastic moduli at 0° from high to low were in the order of 0, 3, 10, and 5 wt.%, and those at 90° were in the order of 3, 0, 10, and 5 wt.% (p < 0.05). For 5 and 10 wt.%, no significant differences were observed in mechanical properties at 0° and 90° (p < 0.05). The Vickers hardness values at 0° and 90° from low to high were in the order of 0, 3, 5, and 10 wt.% (p < 0.05). Within the limits of this study, the optimal zirconia filler content in the photopolymer resin for 3D printing was 0 wt.% at 0° and 3 wt.% at 90°.

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“…A potential explanation can be found in the loss of structural integrity observed in the 3D printed 12 BP over time ( Figure 10 ). The clear resin photopolymer used to manufacture the 3D printed 12 BP suffers, in fact, from significant limitations in terms of mechanical properties and tends to deform over time and light exposure [ 41 , 42 , 43 ]. Even a minimal change in the BP geometry could eventually result in a print with poor dimension accuracy.…”

Section: Resultsmentioning

confidence: 99%

Stereolithography Apparatus Evolution: Enhancing Throughput and Efficiency of Pharmaceutical Formulation Development

2021

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Pharmaceutical applications of 3D printing technologies are growing rapidly. Among these, vat photopolymerisation (VP) techniques, including Stereolithography (SLA) hold much promise for their potential to deliver personalised medicines on-demand. SLA 3D printing offers advantageous features for pharmaceutical production, such as operating at room temperature and offering an unrivaled printing resolution. However, since conventional SLA apparatus are designed to operate with large volumes of a single photopolymer resin, significant throughput limitations remain. This, coupled with the limited choice of biocompatible polymers and photoinitiators available, hold back the pharmaceutical development using such technologies. Hence, the aim of this work was to develop a novel SLA apparatus specifically designed to allow rapid and efficient screening of pharmaceutical photopolymer formulations. A commercially available SLA apparatus was modified by designing and fabricating a novel resin tank and build platform able to 3D print up to 12 different formulations at a single time, reducing the amount of sample resin required by 20-fold. The novel SLA apparatus was subsequently used to conduct a high throughput screening of 156 placebo photopolymer formulations. The efficiency of the equipment and formulation printability outcomes were evaluated. Improved time and cost efficiency by 91.66% and 94.99%, respectively, has been confirmed using the modified SLA apparatus to deliver high quality, highly printable outputs, thus evidencing that such modifications offer a robust and reliable tool to optimize the throughput and efficiency of vat photopolymerisation techniques in formulation development processes, which can, in turn, support future clinical applications.

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Effect of printing direction on stress distortion of three-dimensional printed dentures using stereolithography technology

Cited by 27 publications

References 32 publications

Effect of Printing Direction on the Accuracy of 3D-Printed Dentures Using Stereolithography Technology

Effect of Printing Direction on the Accuracy of 3D-Printed Dentures Using Stereolithography Technology

Effect of Different Filler Contents and Printing Directions on the Mechanical Properties for Photopolymer Resins

Stereolithography Apparatus Evolution: Enhancing Throughput and Efficiency of Pharmaceutical Formulation Development

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