Scattering effects of irradiation on surroundings calculated for a small dental implant.

TY - JOUR

T1 - Scattering effects of irradiation on surroundings calculated for a small dental implant.

AU - Friedrich, Reinhard

AU - Todorovic, Manuel

AU - Heiland, Max

AU - Scheuer, Hanna

AU - Krüll, Andreas

PY - 2012

Y1 - 2012

N2 - A fundamental improvement of restorative dentistry is the compensation of missing teeth by insertion of artificial dental roots allowing retention of dental prosthesis. The function of dental implants conserves a permanent perforation of the mucosa and upholds a non-physiological contact of bone with foreign material and oral micro-organisms. Occasionally head and neck cancer patients are scheduled to receive radiotherapy but are wearing dental implants. An earlier study had shown that the distribution of x-rays is noteworthily changed when dental implants are present in the irradiation field. New implants of smaller size are currently being designed that allow sufficient retention for dental prosthesis. The aim of this consecutive study was to calculate alterations in the irradiated bone caused by a foreign body, representing an implant of reduced size and physical qualities equivalent to titanium, using a stochastic (Monte Carlo) simulation. A clinical linear accelerator was simulated using BEAM/EGS4. The calculations showed that the presence of a dimension-reduced implant results in remarkable differences of the dose distribution all around the implant. Titanium dental implants of reduced size located in the field of irradiation were capable of causing significant radiation scattering. Similar to standard implants, the risk for dose enhancement was notably important for the bone in direct contact with the implant. All therapists involved in the therapy of cancer patients undergoing head and neck radiotherapy should consider the impact of dental implants on the radiation beam as a catalyst of osteoradionecrosis.

AB - A fundamental improvement of restorative dentistry is the compensation of missing teeth by insertion of artificial dental roots allowing retention of dental prosthesis. The function of dental implants conserves a permanent perforation of the mucosa and upholds a non-physiological contact of bone with foreign material and oral micro-organisms. Occasionally head and neck cancer patients are scheduled to receive radiotherapy but are wearing dental implants. An earlier study had shown that the distribution of x-rays is noteworthily changed when dental implants are present in the irradiation field. New implants of smaller size are currently being designed that allow sufficient retention for dental prosthesis. The aim of this consecutive study was to calculate alterations in the irradiated bone caused by a foreign body, representing an implant of reduced size and physical qualities equivalent to titanium, using a stochastic (Monte Carlo) simulation. A clinical linear accelerator was simulated using BEAM/EGS4. The calculations showed that the presence of a dimension-reduced implant results in remarkable differences of the dose distribution all around the implant. Titanium dental implants of reduced size located in the field of irradiation were capable of causing significant radiation scattering. Similar to standard implants, the risk for dose enhancement was notably important for the bone in direct contact with the implant. All therapists involved in the therapy of cancer patients undergoing head and neck radiotherapy should consider the impact of dental implants on the radiation beam as a catalyst of osteoradionecrosis.

KW - Humans

KW - Monte Carlo Method

KW - Radiation Dosage

KW - Radiotherapy Planning, Computer-Assisted

KW - Dental Implants

KW - Head and Neck Neoplasms/radiotherapy

KW - Scattering, Radiation

KW - Humans

KW - Monte Carlo Method

KW - Radiation Dosage

KW - Radiotherapy Planning, Computer-Assisted

KW - Dental Implants

KW - Head and Neck Neoplasms/radiotherapy

KW - Scattering, Radiation

M3 - SCORING: Journal article

VL - 32

SP - 2043

EP - 2046

JO - ANTICANCER RES

JF - ANTICANCER RES

SN - 0250-7005

IS - 5

M1 - 5

ER -