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Study of dental prostheses influence in radiation therapy.
De Conto, C; Gschwind, R; Martin, E; Makovicka, L.
Afiliación
  • De Conto C; IRMA/LCPR-AC/CE, UMR 6249 CNRS, Université de Franche-Comté, BP 71427, 25211 Montbéliard, France; Centre Hospitalier Belfort Montbéliard, Service d'Oncologie et de Radiothérapie, site du Mittan, 56 boulevard du Maréchal Juin, 25209 Montbéliard, France. Electronic address: cdeconto@univ-fcomte.fr.
  • Gschwind R; IRMA/LCPR-AC/CE, UMR 6249 CNRS, Université de Franche-Comté, BP 71427, 25211 Montbéliard, France. Electronic address: regine.gschwind@univ-fcomte.fr.
  • Martin E; Centre Hospitalier Belfort Montbéliard, Service d'Oncologie et de Radiothérapie, site du Mittan, 56 boulevard du Maréchal Juin, 25209 Montbéliard, France.
  • Makovicka L; IRMA/LCPR-AC/CE, UMR 6249 CNRS, Université de Franche-Comté, BP 71427, 25211 Montbéliard, France.
Phys Med ; 30(1): 117-21, 2014 Feb.
Article en En | MEDLINE | ID: mdl-23583116
Dental prostheses made of high density material contribute to modify dose distribution in head and neck cancer treatment. Our objective is to quantify dose perturbation due to high density inhomogeneity with experimental measurements and Monte Carlo simulations. Firstly, measurements were carried in a phantom representing a human jaw with thermoluminescent detectors (GR200A) and EBT2 Gafchromic films in the vicinity of three samples: a healthy tooth, a tooth with amalgam and a Ni-Cr crown, irradiated in clinical configuration. Secondly, Monte Carlo simulations (BEAMnrc code) were assessed in an identical configuration. Experimental measurements and simulation results confirm the two well-known phenomena: firstly the passage from a low density medium to a high density medium induces backscattered electrons causing a dose increase at the interface, and secondly, the passage from a high density medium to a low density medium creates a dose decrease near the interface. So, the results show a 1.4% and 23.8% backscatter dose rise and attenuation after sample of 26.7% and 10.9% respectively for tooth with amalgam and crown compared to the healthy tooth. Although a tooth with amalgam has a density of about 12-13, the changes generated are not significant. However, the results for crown (density of 8) are very significant and the discordance observed may be due to calculation point size difference 0.8 mm and 0.25 mm respectively for TLD and Monte Carlo. The use of Monte Carlo simulations and experimental measurements provides objective evidence to evaluate treatment planning system results with metal dental prostheses.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Prótesis Dental / Neoplasias de Cabeza y Cuello Tipo de estudio: Health_economic_evaluation Límite: Humans Idioma: En Revista: Phys Med Asunto de la revista: BIOFISICA / BIOLOGIA / MEDICINA Año: 2014 Tipo del documento: Article Pais de publicación: Italia
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Prótesis Dental / Neoplasias de Cabeza y Cuello Tipo de estudio: Health_economic_evaluation Límite: Humans Idioma: En Revista: Phys Med Asunto de la revista: BIOFISICA / BIOLOGIA / MEDICINA Año: 2014 Tipo del documento: Article Pais de publicación: Italia