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Effects of Postcuring Temperature on the Mechanical Properties and Biocompatibility of Three-Dimensional Printed Dental Resin Material

 Enkhjargal Bayarsaikhan  ;  Jung-Hwa Lim  ;  Seung-Ho Shin  ;  Kyu-Hyung Park  ;  Young-Bum Park  ;  Jae-Hoon Lee  ;  Jong-Eun Kim 
 POLYMERS, Vol.13(8) : 1180, 2021-04 
Journal Title
Issue Date
CAD/CAM ; additive manufacturing ; cell viability ; confocal laser scanning ; cytotoxicity ; degree of conversion ; flexural strength ; postcuring ; rapid prototyping ; three-dimensional printing
Three-dimensional (3D) printing is an attractive technology in dentistry. Acrylic-based 3D printed resin parts have to undergo postcuring processes to enhance their mechanical and biological properties, such as UV-light and thermal polymerization. However, no previous studies have revealed how the postcuring temperature influences the biocompatibility of the produced parts. Therefore, we postprocessed 3D printed denture teeth resin under different postcuring temperatures (40, 60 and 80 °C) for different periods (15, 30, 60, 90 and 120 min), and evaluated their flexural properties, Vickers hardness, cell cytotoxicity, cell viability, and protein adsorption. In addition, confocal laser scanning was used to assess the condition of human gingival fibroblasts. It was found that increasing the postcuring temperature significantly improved the flexural strength and cell viability. The flexural strength and cell viability were 147.48 ± 5.82 MPa (mean ± standard deviation) and 89.51 ± 7.09%, respectively, in the group cured at 80 °C for 120 min, which were higher than the values in the 40 and 60 °C groups. The cell cytotoxicity increased in the 40 °C groups and for longer cultivation time. Confocal laser scanning revealed identifiable differences in the morphology of fibroblasts. This study has confirmed that the postcuring temperature influences the final mechanical and biological properties of 3D printed resin.
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2. College of Dentistry (치과대학) > Dept. of Prosthodontics (보철과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Jong Eun(김종은) ORCID logo https://orcid.org/0000-0002-7834-2524
Park, Young Bum(박영범)
Lee, Jae Hoon(이재훈) ORCID logo https://orcid.org/0000-0003-2281-8885
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