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KMID : 0362120210430010001
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Journal of Technologic Dentistry
2021 Volume.43 No. 1 p.1 ~ p.5
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Comparison of shrinkage according to thickness of photopolymerization resin for 3D printing
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Kim Dong-Yeon
Kim Jae-Hong
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Abstract
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Purpose: To perform a comparative study on curing shrinkage according to the thickness of photopolymerization resin.
Methods: Stainless steel molds of 2, 4, and 6 mm heights were prepared. The 2, 4, and 6 mm-height molds were classified as the 2H, 4H, and 6H groups, respectively. A photopolymerization resin was injected into the stainless steel mold. Photopolymerization was carried out using a photopolymer machine. During photopolymerization, the wavelength and intensity of 400~405 nm were set to 10, the highest intensity among 1~10. Photopolymerization was performed for 30 min per specimen (each group=10). The inner and outer areas of the specimen were measured. The data were analyzed using one-way ANOVA and Kruskal?Wallis H test (α=0.05).
Results: In terms of the inner and outer diameters of the photopolymerization resin specimen, the 2H group contracted the most, whereas the 6H group contracted the least. A statistically significant difference was found between the groups (p<0.05).
Conclusion: The amount of light irradiation of the photopolymerization resin must be adjusted according to the thickness.
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KEYWORD
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3D printing, Photopolymer, Shrinkage, Thickness
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