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Dentomaxillofacial Radiology (2006) 35, 426-431
© 2006 British Institute of Radiology
doi: 10.1259/dmfr/14404583

RESEARCH

The influence of the X-ray spectrum at compact bone–titanium interfaces in digital dental radiography

K Nicopoulou-Karayianni*,1, T Koligliatis2, C Donta-Bakogianni1 and A Karayiannis3

1 Department of Oral Diagnosis, Dental School, University of Athens, Greece; 2 Medical Physics Department, "St. Savvas" Oncological Hospital, Athens, Greece; 3 Department of Fixed Prosthetics, Dental School, University of Athens, Athens, Greece

*Correspondence to: Dr Kety Nicopoulou-Karayianni, Kifisou 3A, Halandri, Athens 152 34, Greece; Email: ketykara{at}otenet.gr

Received 18 April 2005; revised 21 December 2005; accepted 4 January 2006

Objectives: To determine the optimum X-ray spectrum in digital dental radiography once the dose around an implant and the diagnostic usefulness of the image are taken into account.

Materials and methods: A Monte Carlo code (MCNP4B) was employed for computing the dose distribution across the bone–titanium interface. The X-ray spectra used were those met in digital dental radiography; 50–70 kVp, 2 mm Al total filtration, 5 kVp increment.

Results: The variation of the ratio of dose with as opposed to without implant against depth reaches maximum values at the bone–implant interface that vary between 2.9 and 3.2. For the same number of photon histories followed, the higher the tube potential setting, the greater the dose both in contact and inside the implant.

Conclusion: In digital dental radiography, a 60–65 kVp spectrum accompanied by the known 30% reduction in mAs leads to lower dose to the patient for a diagnostically useful image.

Keywords: compact bone–titanium interface; digital dental radiography; Monte Carlo; spectra






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