PMID: 9422579Jan 9, 1998Paper

Dose variation at bone/titanium interfaces using titanium hollow screw osseointegrating reconstruction plates

International Journal of Radiation Oncology, Biology, Physics
A S AllalJ M Kurtz

Abstract

To evaluate dose variations at bone/titanium interfaces in an experimental model designed to simulate postoperative radiotherapy in patients with mandibular reconstructions using a titanium hollow-screw osseointegrating reconstruction plate (THORP) system. The model consisted of a 25 x 25 x 10 mm3 block of fresh bovine femoral diaphysis, to the surface of which a segment of THORP system reconstruction plate was fixed by means of a solid titanium screw 4 mm in diameter and 10 mm in length. Using specially designed thermoluminescent dosimeters (TLD) 2 mm in diameter and 0.13 mm in thickness, dose measurements were carried out at four distances from the screw axis (0.1, 0.3, 0.6, and 1 mm). 60Co and 6-MV photon beams were used at incidences both perpendicular and parallel ("axial") to the screw axis. For 6-MV X-ray beams incident perpendicular to the screw axis, the maximum dose enhancement (due to backscatter) and the maximum dose reduction (due to attenuation) at the bone/titanium interface were 5% (+/- 2%) and 6% (+/- 2%), respectively. The corresponding values for 60Co beams were 6% (+/- 5%) and 10% (+/- 5%). For the axial incidences, a maximum dose enhancement of 5-7% was noted for both 6-MV X-rays and 60Co for beams incident...Continue Reading

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Citations

Jul 29, 2003·American Journal of Otolaryngology·Francisco V de Mello-FilhoCatherine E Miles
Feb 14, 2009·Dermatologic Surgery : Official Publication for American Society for Dermatologic Surgery [et Al.]·Manuel Angel Rodriguez-PrietoPedro Sánchez-Sambucety
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