The Journal of prosthetic dentistry · 2025
Impact of 3D resin and base designs on the accuracy of additively manufactured casts using a stereolithography technology.
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Piedra-Cascón Wenceslao, Oteo-Morilla Carlos, Pose-Rodriguez Jose Manuel, Gallas-Torreira Mercedes
Аннотация
STATEMENT OF PROBLEM: Three-dimensional (3D) printed casts can be fabricated using a wide range of 3D polymer resins and designed with varying casts´ base configurations. Nevertheless, the influence of different base designs, in conjunction with various 3D printing resins, on the final dimensional accuracy of casts manufactured through SLA-LCD 3D printing technology remains unclear.
PURPOSE: This study assessed the impact of 3D printing resins and base designs on the dimensional accuracy of diagnostic casts fabricated using a SLA-LCD vat-polymerization 3D printer. Two resins (NextDent Model 2.0 and Aqua Gray 4K) and 5 different base configurations were evaluated for their effect on trueness and precision.
MATERIAL AND METHODS: A digital maxillary cast was modified into three base designs: solid (Group S), honeycomb (Group HC), and hollow (Group H). Honeycomb and hollow designs had subgroups with 1-mm (HC1, H1) and 2-mm (HC2, H2) wall thicknesses, resulting in 50 specimens (n=10 per subgroup). Eleven embedded precision cubes were used for accuracy assessment. A Sonic Mini 4K vat-polymerization printer was used for cast printing, and dimensional deviations were captured using a coordinate measuring device. Trueness was defined by the average dimensional discrepancy, and precision was indicated by the standard deviation. Statistical analysis included Kruskal-Wallis and Mann-Whitney U tests (α=.05).
RESULTS: NextDent resin showed trueness falling between 44.8 5 µm and 64.5 µm and precision values varying between 33.5 5 µm and 48.9 µm, while Aqua Gray 4K resin ranged from 24.1 5 µm to 81.1 µm for trueness and 19.8 5 µm to 65.9 µm for precision. Significant differences (P<.001) were observed in all axes (x-, y-, z-axes) and 3D deviations, influenced by resin and base design.
CONCLUSIONS: Resin type and base design significantly affect the dimensional accuracy of 3D printed casts. Aqua Gray 4K with a 2-mm hollow base provided the highest accuracy, particularly when matched with the printer manufacturer. All casts met clinical standards.
PURPOSE: This study assessed the impact of 3D printing resins and base designs on the dimensional accuracy of diagnostic casts fabricated using a SLA-LCD vat-polymerization 3D printer. Two resins (NextDent Model 2.0 and Aqua Gray 4K) and 5 different base configurations were evaluated for their effect on trueness and precision.
MATERIAL AND METHODS: A digital maxillary cast was modified into three base designs: solid (Group S), honeycomb (Group HC), and hollow (Group H). Honeycomb and hollow designs had subgroups with 1-mm (HC1, H1) and 2-mm (HC2, H2) wall thicknesses, resulting in 50 specimens (n=10 per subgroup). Eleven embedded precision cubes were used for accuracy assessment. A Sonic Mini 4K vat-polymerization printer was used for cast printing, and dimensional deviations were captured using a coordinate measuring device. Trueness was defined by the average dimensional discrepancy, and precision was indicated by the standard deviation. Statistical analysis included Kruskal-Wallis and Mann-Whitney U tests (α=.05).
RESULTS: NextDent resin showed trueness falling between 44.8 5 µm and 64.5 µm and precision values varying between 33.5 5 µm and 48.9 µm, while Aqua Gray 4K resin ranged from 24.1 5 µm to 81.1 µm for trueness and 19.8 5 µm to 65.9 µm for precision. Significant differences (P<.001) were observed in all axes (x-, y-, z-axes) and 3D deviations, influenced by resin and base design.
CONCLUSIONS: Resin type and base design significantly affect the dimensional accuracy of 3D printed casts. Aqua Gray 4K with a 2-mm hollow base provided the highest accuracy, particularly when matched with the printer manufacturer. All casts met clinical standards.