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Evaluation of scatter dose of dental titanium implants exposed to photon beams of different energies and irradiation angles in head and neck radiotherapy

¹ Department of Radiation Oncology, Gülhane Military Medical Academy, Ankara, Turkey; ² Department of Prosthetic Dentistry, Gülhane Military Medical Academy, Ankara, Turkey; ³ Department of Oral Diagnosis and Radiology, Gülhane Military Medical Academy, Ankara, Turkey

*Correspondence to: Dr Murat Beyzadeoglu, Gulhane Military Medical School, Department of Radiation Oncology, 06018, Etlik, Ankara, Turkey; E-mail: muratbeyzadeoglu{at}yahoo.com

Received 21 December 2004; revised 27 April 2005; accepted 13 June 2005

Objectives: In this study, quantification of backscatter doses between scattering titanium dental implant and the thermoluminescent dosimeter (TLD₁₀₀) radiation detector at axial beam irradiation-angle range of 0–90° in head and neck radiotherapy is done to evaluate irradiation angle dependency of dose enhancement contributing to osteoradionecrosis.

Methods: A cylindrical titanium dental implant with diameter of 4 mm and length of 9 mm was implanted into a specially-designed human mandible phantom with a TLD₁₀₀ chip placed on the buccal site and irradiated with 6 MV X, 25 MV X and Co-60 gamma sources at 19 different irradiation angles.

Results: Dose enhancement on a buccal site of the titanium implant depends on the incident beam angle. At angles of 65°, 60° and 40° the maximum detected scatter doses over the titanium implant are 36%, 32% and 23% for Co-60 gamma, 6 MV X-ray and 25 MV X-ray, respectively. The dose enhancement at different beam angles was less pronounced in 25 MV X and more pronounced in Co-60 gamma irradiation.

Conclusions: For the different radiation beams studied, the irradiation angle between scattering titanium dental implants and the central axis does not significantly affect the total dose that may lead to osteoradionecrosis of the mandible.

Keywords: backscatter radiation; titanium dental implant; head and neck cancer; osteoradionecrosis

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