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Article

Effect of Nitrogen Gas Post-Curing and Printer Type on the Mechanical Properties of 3D-Printed Hard Occlusal Splint Material

1
Department of Biomaterials Science, Turku Clinical Biomaterials Centre—TCBC, Institute of Dentistry, University of Turku, Itäinen Pitkäkatu 4B, 20520 Turku, Finland
2
Department of Advanced Prosthodontics, Tokyo Medical and Dental University—TMDU, 1-5-45, Yushima, Bunkyo-ku, Tokyo 113-8510, Japan
3
Department of Pediatric Dentistry/Special Needs Dentistry, Tokyo Medical and Dental University—TMDU, 1-5-45, Yushima, Bunkyo-ku, Tokyo 113-8510, Japan
4
City of Turku Welfare Division, Oral Health Care, Puolalankatu 5, 20101 Turku, Finland
*
Authors to whom correspondence should be addressed.
Academic Editor: Muhammad Sohail Zafar
Polymers 2022, 14(19), 3971; https://doi.org/10.3390/polym14193971
Received: 19 August 2022 / Revised: 12 September 2022 / Accepted: 19 September 2022 / Published: 22 September 2022
(This article belongs to the Special Issue Materials and Technology: Dental 3D Printing)
Although three-dimensional (3D) printing is clinically convenient to fabricate occlusal splints, it is still unclear how the post-curing method and the printer type can affect 3D-printed splints. This study aimed to evaluate the effect of stroboscopic post-curing at a nitrogen gas (N2) atmosphere versus post-curing in an air atmosphere, as well as the printer type (liquid crystal display (LCD) and digital light processing (DLP)) on the mechanical properties of a 3D-printed hard-type occlusal splint material. Flexural strength, flexural modulus, Vickers hardness number (VHN), fracture toughness, degree of double bond conversion (DC), 3D microlayer structure, water sorption, and water solubility were evaluated. The post-curing method significantly affected all evaluated properties except fracture toughness and 3D microlayer structure, while the printer type significantly affected all evaluated properties except flexural strength and flexural modulus. VHN and DC were significantly higher, and the smoother surface was noticeably obtained when printed by LCD printer and post-cured at an N2 atmosphere. The current results suggested that the post-curing method and the printer type would play a role in the mechanical properties of the evaluated material and that the combination of post-curing at an N2 atmosphere and LCD printer could enhance its mechanical properties and surface smoothness. View Full-Text
Keywords: 3D printing; mechanical property; degree of double bond conversion; microlayer structure; occlusal splint; post-curing; nitrogen gas 3D printing; mechanical property; degree of double bond conversion; microlayer structure; occlusal splint; post-curing; nitrogen gas
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MDPI and ACS Style

Wada, J.; Wada, K.; Gibreel, M.; Wakabayashi, N.; Iwamoto, T.; Vallittu, P.K.; Lassila, L. Effect of Nitrogen Gas Post-Curing and Printer Type on the Mechanical Properties of 3D-Printed Hard Occlusal Splint Material. Polymers 2022, 14, 3971. https://doi.org/10.3390/polym14193971

AMA Style

Wada J, Wada K, Gibreel M, Wakabayashi N, Iwamoto T, Vallittu PK, Lassila L. Effect of Nitrogen Gas Post-Curing and Printer Type on the Mechanical Properties of 3D-Printed Hard Occlusal Splint Material. Polymers. 2022; 14(19):3971. https://doi.org/10.3390/polym14193971

Chicago/Turabian Style

Wada, Junichiro, Kanae Wada, Mona Gibreel, Noriyuki Wakabayashi, Tsutomu Iwamoto, Pekka K. Vallittu, and Lippo Lassila. 2022. "Effect of Nitrogen Gas Post-Curing and Printer Type on the Mechanical Properties of 3D-Printed Hard Occlusal Splint Material" Polymers 14, no. 19: 3971. https://doi.org/10.3390/polym14193971

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