A Monte Carlo study on dose perturbation due to dental restorations in a 15 MV photon beam

Azizi, M. and Mowlavi, A. and Ghorbani, M. and Knuap, C. and Behmadi, M. (2019) A Monte Carlo study on dose perturbation due to dental restorations in a 15 MV photon beam. Journal of Cancer Research and Therapeutics, 15 (3). pp. 491-497.

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Abstract

Aim: The main purpose of this study is to evaluate the effect of dose perturbation due to common dental restoration materials in the head and neck radiotherapy with a 15 MV external photon beam. Setting and Design: Teeth with three dental restorations such as tooth filled with Amalgam, Ni-Cr alloy, and Ceramco were simulated by MCNPX Monte Carlo code. In this simulation, the dental materials were exposed by a 15 MV photon beam from a Siemens Primus linac, inside a water phantom. Materials and Methods: A Siemens Primus linear accelerator and a phantom including: tooth only, tooth with Amalgam, tooth with Ni-Cr alloy, and tooth with Ceramco were simulated by MCNPX Monte Carlo code, separately. The percentage dose change was evaluated relative to dose in water versus depth for these samples on the beam's central axis. The absolute dose by prescription of 100 cGy dose in water phantom at 3.0 cm depth was calculated for water, tooth, tooth with Amalgam, tooth with Ni-Cr alloy, and tooth with Ceramco. Results: The maximum percentage dose change is related to tooth with Ni-Cr alloy, tooth, tooth with Ceramco, and tooth with Amalgam with amounts of 7.73, 6.95, 4.7, and 3.06 relative to water at 0.75 cm depth, respectively. When 100.0 cGy dose was prescribed at 3.1 cm, the maximum absolute dose was 201.0 in the presence of tooth with Ni-Cr alloy at 0.75 cm. Conclusion: Introduction of the compositions of dental restorations can improve the accuracy of dosimetric calculations in treatment planning and protect the healthy tissues surrounding teeth from a considerable overdose. © 2018 Journal of Cancer Research and Therapeutics | Published by Wolters Kluwer-Medknow.

Item Type: Article
Additional Information: Export Date: 16 February 2020 Correspondence Address: Azizi, M.; Department of Physics, School of Sciences, Hakim Sabzevari UniversityIran; email: monaazizi68@gmail.com
Uncontrolled Keywords: Dental restoration dose distribution dose perturbation external beam radiotherapy photon beam dental alloy dental amalgam dental material Ceramco dental porcelain Article cancer radiotherapy comparative study controlled study dosimetry head and neck cancer human Monte Carlo method obese patient photon therapy prescription radiation dose distribution radiotherapy dosage adverse event radiotherapy Dental Alloys Dental Restoration Repair Humans
Subjects: WU Dentistry. Oral surgery
Divisions: Mashhad University of Medical Sciences
Depositing User: mr lib1 lib1
Date Deposited: 21 Jun 2020 05:00
Last Modified: 21 Jun 2020 05:00
URI: http://eprints.mums.ac.ir/id/eprint/18270

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