Investigation and Optimization of the Impact of Printing Orientation on Mechanical Properties of Resin Sample in the Low-Force Stereolithography Additive Manufacturing

Wang, Enshuai; Yang, Fei; Shen, Xinmin; Li, Zhizhong; Yang, Xiaocui; Zhang, Xiangpo; Peng, Wenqiang

doi:10.3390/ma15196743

Cited by 5 publications

(3 citation statements)

References 43 publications

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“…The properties of 3D-printable resin, including strength, flexibility, and biocompatibility, are also affected by the chemical composition of the resin [23]. Moreover, the parameters for printing can influence the quality and accuracy of the resultant resin [24]. Postprocessing procedures, such as polishing, coating, or curing, can further modify the characteristics of the 3D-printed resin.…”

Section: Introductionmentioning

confidence: 99%

Comparative Evaluation of TiO2 Nanoparticle Addition and Postcuring Time on the Flexural Properties and Hardness of Additively Fabricated Denture Base Resins

AlGhamdi,

Fouda,

Taymour

et al. 2023

Nanomaterials

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Three-dimensionally (3D)-printed fabricated denture bases have shown inferior strength to conventional and subtractively fabricated ones. Several factors could significantly improve the strength of 3D-printed denture base resin, including the addition of nanoparticles and post-curing factors. This study evaluated the effect of TiO2 nanoparticle (TNP) addition and the post-curing time (PCT) on the flexural properties and hardness of three-dimensionally (3D)-printed denture base resins. A total of 360 specimens were fabricated, with 180 specimens from each type of resin. For evaluating the flexural properties, bar-shaped specimens measuring 64 × 10 × 3.3 mm were used, while, for the hardness testing, disc-shaped specimens measuring 15 × 2 mm were employed. The two 3D-printed resins utilized in this study were Asiga (DentaBASE) and NextDent (Vertex Dental B.V). Each resin was modified by adding TNPs at 1% and 2% concentrations, forming two groups and an additional unmodified group. Each group was divided into three subgroups according to the PCT (15, 60, and 90 min). All the specimens were subjected to artificial aging (5000 cycles), followed by testing of the flexural strength and elastic modulus using a universal testing machine, and the hardness using the Vickers hardness test. A three-way ANOVA was used for the data analysis, and a post hoc Tukey’s test was used for the pairwise comparisons (α = 0.05). Scanning electron microscopy (SEM) was used for the fracture surface analysis. The addition of the TNPs increased the flexural strength in comparison to the unmodified groups (p < 0.001), while there was no significant difference in the elastic modulus and hardness with the 1% TNP concentration. Among the TNP groups, the 2% TNP concentration significantly decreased the elastic modulus and hardness (p < 0.001). The SEM showed a homogenous distribution of the TNPs, and the more irregular fracture surface displayed ductile fractures. The PCT significantly increased the flexural strength, elastic modulus, and hardness (p < 0.001), and this increase was time-dependent. The three-way ANOVA results revealed a significant difference between the material types, TNP concentrations, and PCT interactions (p < 0.001). Both concentrations of the TNPs increased the flexural strength, while the 2% TNP concentration decreased the elastic modulus and hardness of the 3D-printed nanocomposites. The flexural strength and hardness increased as the PCT increased. The material type, TNP concentration, and PCT are important factors that affect the strength of 3D-printed nanocomposites and could improve their mechanical performance.

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Section: Introductionmentioning

confidence: 99%

Comparative Evaluation of TiO2 Nanoparticle Addition and Postcuring Time on the Flexural Properties and Hardness of Additively Fabricated Denture Base Resins

AlGhamdi,

Fouda,

Taymour

et al. 2023

Nanomaterials

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“…The multiple parallel connection HRs with the embedded aperture is fabricated by the low-force stereolithography 3D printer Form3 (Formlabs Inc., Summerville, MA, USA) [ 35 ], as shown in Figure 16 . It consists of a tangent sectional shape of olive and a cross-sectional shape of round.…”

Section: Designs and Optimizationsmentioning

confidence: 99%

Effects of Aperture Shape on Absorption Property of Acoustic Metamaterial of Parallel-Connection Helmholtz Resonator

Yang

Tang³

et al. 2023

Materials

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A Helmholtz resonator (HR) with an embedded aperture is an effective acoustic metamaterial for noise reduction in the low-frequency range. Its sound absorption property is significantly affected by the aperture shape. Sound absorption properties of HRs with the embedded aperture for various tangent sectional shapes were studied by a two-dimensional acoustic finite element simulation. The sequence of resonance frequency from low to high was olive, common trapeziform, reverse trapeziform, dumbbell and rectangle. Meanwhile, those HRs for various cross-sectional shapes were investigated by a three-dimensional acoustic finite element simulation. The sequence of resonance frequency from low to high were round, regular hexagon, square, regular triangle and regular pentagon. Moreover, the reason for these phenomena was analyzed by the distributions of sound pressure, acoustic velocity and temperature. Furthermore, on the basement of the optimum tangent and cross-sectional shape, the sound absorption property of parallel-connection Helmholtz resonators was optimized. The experimental sample with optimal parameters was fabricated, and its average sound absorption coefficient reached 0.7821 in 500–820 Hz with a limited thickness of 30 mm. The research achievements proved the significance of aperture shape, which provided guidance for the development of sound absorbers in the low-frequency range.

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“…32 In 3D printing, manufacturing orientation is a significant factor because it can have an impact on the end quality of an object, its strength, and the overall appearance of the printed sample. Wang et al 33 discussed the impact of printing directions on mechanical behavior. Jordi et al 34 outlined how various stress levels and strainrate regimens are affected by printing orientation.…”

Section: Additive Manufacturing Technique To Develop Gyroid Latticementioning

confidence: 99%

Uniform and graded bio-inspired gyroid lattice: Effects of post-curing and print orientation on mechanical property

Chouhan,

Bala Murali

2023

Proceedings of the Institution of Mechanical Engineers, Part L:

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Additive manufacturing is spreading rapidly because it offers great design freedom in creating intricate lightweight shapes using lattice structures that offer numerous possibilities, including applications in aerospace, automotive, and electronics where mechanical properties are paramount. In this paper, inspired by the wing scale of the C. Rubi butterfly, unique uniform and density-graded gyroid lattice structures were proposed. This research designed the uniform gyroid lattice structure with two design configurations of unit cell sizes (4, 6, and 8) and solidity percentages (20, 30, 40, and 50) and density-graded gyroid with a solidity range of 20–80% in a constant volume of 30*30*30 mm. The designs have been modeled in nTopology software and manufactured using the Vat polymerization additive manufacturing technique with two printing orientations (0° and 25°). Two sets of the samples were printed, and one group was given postcuring treatment at 80°C for 2 hours. Quasi-static compression testing was performed to investigate the improvement in mechanical characteristics due to postcuring treatment and print orientation. The results indicate significant relationships between design parameters and mechanical performance. The density-graded gyroid lattice exhibits four times higher compressive strength than higher solidity uniform gyroid samples (UC-8-solidity-40 and 50%) when subjected to the same or less mass. In addition, debonding of connecting surfaces due to higher postcuring temperature, and better performance of horizontally printed samples have been addressed. Moreover, simulation and experimental deformation patterns for uniform and graded gyroid lattice structures have been displayed.

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Investigation and Optimization of the Impact of Printing Orientation on Mechanical Properties of Resin Sample in the Low-Force Stereolithography Additive Manufacturing

Cited by 5 publications

References 43 publications

Comparative Evaluation of TiO2 Nanoparticle Addition and Postcuring Time on the Flexural Properties and Hardness of Additively Fabricated Denture Base Resins

Comparative Evaluation of TiO2 Nanoparticle Addition and Postcuring Time on the Flexural Properties and Hardness of Additively Fabricated Denture Base Resins

Effects of Aperture Shape on Absorption Property of Acoustic Metamaterial of Parallel-Connection Helmholtz Resonator

Uniform and graded bio-inspired gyroid lattice: Effects of post-curing and print orientation on mechanical property

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