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KMID : 1157520230190010013
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International Journal of Clinical Preventive Dentistry
2023 Volume.19 No. 1 p.13 ~ p.18
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Evaluation of the Marginal and Internal Fit of Temporary Dental Resins According to Slice Thickness of DLP Printer
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Lee Ye-Jin
Lee Chung-Jae
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Abstract
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Objective: To evaluate the marginal and internal fitness of temporary dental resin according to the slice thickness of Digital Light Processing (DLP) 3D printers, considering the rapid spread and use of dental 3D printers.
Methods: The temporary dental resin specimens were classified into five groups according to the slice thickness of the DLP 3D printer: 0.01 mm, 0.025 mm, 0.075 mm, 0.1 mm, and 0.15 mm, with ten specimens in each group, amounting to a total of 50 specimens. The scanned data of the silicone impressions obtained from the scanner were evaluated for fitness in the marginal, axial, and cuspal regions using a CAD program.
Results: The mean values of the descriptive statistics of the gaps by slice thickness for DLP 3D printers showed the
highest gaps in the 0.15 mm group, and relatively low gaps in the 0.01 mm group. When examined by site, the lingual cusp had the highest spacing, while the lingual margin had relatively low spacing. Significant differences were found by slice thickness (p＜0.001) and by measurement site (p＜0.001). There was a significant combined effect of Slice Thickness and Site (p=0.001).
Conclusion: Based on the above results, the temporary dental restorative resins produced by DLP 3D printers show higher fitness with thinner slice thickness and all of them are in the clinically acceptable range (＜120 μm), suggesting they can be sufficiently used for making temporary dental restorative resins.
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KEYWORD
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3D printer, slice thickness, temporary denture resin, fitness
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