Radiation attenuation properties of materials used to fabricate radiotherapy prostheses in vitro study.

Autor:	Towithelertkul C; Department of Advanced Prosthodontics, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University., Sumita YI; Department of Advanced Prosthodontics, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University., Murakami T; Department of Radiation Therapeutics and Oncology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University.; School of Radiological Technology, Gunma Prefectural College of Health Sciences., Notake R; Department of Radiology, Tokyo Medical and Dental University, Medical Hospital., Akiyama M; Research Administration Division, Tokyo Medical and Dental University., Yoshimura R; Department of Radiation Therapeutics and Oncology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University., Wakabayashi N; Department of Advanced Prosthodontics, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University.
Jazyk:	angličtina
Zdroj:	Journal of oral science [J Oral Sci] 2022 Oct 01; Vol. 64 (4), pp. 274-278. Date of Electronic Publication: 2022 Sep 07.
DOI:	10.2334/josnusd.22-0167
Abstrakt:	Purpose: This study investigates the attenuation of radiation doses by four materials, heat-polymerized, and self-polymerized polymethyl methacrylate (PMMA), putty-type, and injection-type polyvinyl siloxane (PVS) impression material. This in vitro study should aid in the selection of dental materials for radiotherapy prostheses, thereby minimizing the possibility of radiotherapy side effects. Methods: Specimens of each type were fabricated as a 5 × 5 cm squares with a thickness of 10 mm. Heat-polymerizing PMMA, self-polymerizing PMMA, putty-type PVS impression material, and injection-type PVS impression material were selected. A calibration curve was created to determine the association of radiation doses and grayscale value. A linear accelerator was used to irradiate the specimens. The radiation doses above and below the materials were measured using radiochromic film dosimetry. After film irradiation, the pixel scale of color change was used to determine the radiation dose based on the created calibration curve. The results were exported to find average doses to calculate the percentage of the attenuated dose for a comparison of the four materials. Results: The average attenuated doses of heat-polymerizing PMMA, self-polymerizing PMMA, putty-type PVS, and injection-type PVS were 10.8%, 6.2%, 17.2%, and 14.2% respectively. Conclusion: PVS showed higher attenuating radiation exposure compared with PMMA.
Databáze:	MEDLINE
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