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Effects of post-processing curing parameters and gamma irradiation on the mechanical properties of medical graded vat photopolymerization parts

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Publicado en:Rapid Prototyping Journal vol. 30, no. 3 (2024), p. 475-489
Autor principal: Daoset, Natthawut
Otros Autores: Inglam, Samroeng, Wanchat, Sujin, Chantarapanich, Nattapon
Publicado:
Emerald Group Publishing Limited
Materias:
Formlabs Inc
United States > US
Mechanical properties
Photopolymers
Transplants & implants
Medical technology
Surgical instruments
Photopolymerization
Medical device industry
Medical devices
Manufacturing
Surgical apparatus & instruments
Gamma irradiation
Tensile strength
Temperature
Exposure
Gamma rays
Curing
Medical equipment
Sterilization
Dentistry
Parameters
Radiation dosage
Rapid prototyping
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Resumen:PurposeThis paper aims to investigate the influence of post-curing temperature, post-curing time and gamma ray irradiation dose upon the tensile and compressive mechanical properties of the medical graded vat photopolymerization parts.Design/methodology/approachMedical graded vat photopolymerization specimens, made from photopolymer resin, were fabricated using bottom-up vat photopolymerization machine. Tensile and compressive tests were conducted to assess the mechanical properties. The specimens were categorized into uncured and post-curing groups. Temperature post-processing and/or gamma irradiation exposure were for post-curing specimens. The post-curing parameters considered included temperature levels of 50°C, 60°C and 70°C, with 1, 2, 3 and 4 h periods. For the gamma irradiation, the exposure doses were 25, 50, 75 and 100 kGy.FindingsPost-curing improved the mechanical properties of medical graded vat photopolymerization parts for both tensile and compressive specimens. Post-curing temperature greater than 50°C or a prolonged post-curing period of more than 1 h made insignificant changes or deterioration in mechanical properties. The optimal post-curing condition was therefore a 50°C post-curing temperature with 1 h post-curing time. Exposure to gamma ray improved the compressive mechanical properties, but deteriorated tensile mechanical properties. Higher gamma irradiation doses could decrease the mechanical properties and also make the part more brittle, especially for doses more than 25 kGy.Originality/valueThe obtained results would be beneficial to the medical device manufacturer who fabricated the invasive temporary contact personalized surgical instruments by vat photopolymerization technique. In addition, it also raised awareness in excessive gamma sterilization in the medical graded vat photopolymerization parts.
ISSN:1355-2546
1758-7670
DOI:10.1108/RPJ-07-2023-0226
Fuente:ABI/INFORM Global