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Dentomaxillofacial Radiology (2008) 37, 149-153
© 2008 British Institute of Radiology
doi: 10.1259/dmfr/29131739

RESEARCH

Dose inhomogeneities on surfaces of different dental implants during irradiation with high-energy photons

T Binger*,1, H Seifert2, G Blass3, K-H Bormann4 and M Rücker4

1 Department of Oral and Maxillofacial Surgery, University Clinic Homburg, Germany, 2 Institute for General Radiology and Medical Physics, University of Veterinary Medicine, Hannover, Germany, 3 Department of Radiotherapy, University Clinic Homburg, Germany, 4 Department of Oral and Maxillofacial Surgery, Hannover Medical School, Germany

*Correspondence to: Dr Thomas Binger, Department of Oral and Maxillofacial Surgery, University Clinic Homburg, D-66421 Homburg/Saar, Germany; E-mail: zmktbin{at}uniklinik-saarland.de

Received 27 September 2006; revised 22 March 2007; accepted 6 April 2007

Objectives: The aim of this study was to determine the radiation doses in mucosa and bone close to the surface of different dental implant materials.

Methods: Radiation dose was measured at the interface of bone or soft tissue and various implant materials for 6 MV photons generated by a medical linear accelerator using a phantom and ultrathin thermoluminescent dosemeters.

Results: Increasing thickness of implant materials resulted in a dose decrease in bone immediately behind the implants. Directly in front of titanium implants, dose increases of 18.2% and 30.4% were found in bone and soft tissue, respectively, independent of implant thickness and surface structure (polished/plasma coated). Even a titanium coating with 70 µm hydroxyapatite did not affect the scattering dose. In contrast, for aluminium oxide ceramics, a scatter-induced notable dose increase could not be assessed.

Conclusions: During irradiation with high-energy photons, an implant-induced dose enhancement could be reduced in bone using the technique of multiple fields and in soft tissue using ceramic abutments.

Keywords: backscatter radiation; radiotherapy; dental implants; implant coating






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