Study the effect of dental implants on radiotherapy dose distribution: Mont Carlo approach

Considering the presence of important organs in head
and neck area, treatment of tumors which are existing in this area is very important. The existence of dental implants will effect on dose distribution in radiotherapy. The aim of the present research was to study the effect of dimensions and materials dental implants on radiotherapy dose distribution in using the Monte Carlo method. In this research study a Varian 2100 C/D linear accelerator with energy of 6MV was simulated using the Monte Carlo Code (MCNP). In order to assess the simulation correctness and accuracy, the results of Percentage Depth Dose and the dose profiles obtained from the simulation were compared with the experimental dosimetry. Then, dental implants with length 1.5 cm and diameter 0.4 cm dimensions and length 1.3 cm and diameter 0.7 cm dimensions made of tantalum, steel stainless 3161, zirconium oxid, titanium alloy, oxide aluminum and polytetrafluoroethylene were added to the simulation program. FINDUNGS: The larger dental implants have shown the increase of more dose 5.82%, 5.03%, 4.83%, 4.42%, 3.81% and 3.54% regading the above-mentioned materials.The tantalum dental implant caused the greatest heterogeneity. The research results indicated the effect of dental implants on dose distribution in cancer patients under radiotherapy depends on its gender and cross section.