J G Duvenage

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Implanto-orthognathic reconstructive surgery (IORS) entails a combination of three different types of surgical involvement for the reconstruction of the atrophic mandibular or maxillary alveolar ridge. The surgery combines an orthognathic procedure with interpositional bone grafts and placement of osseointegrated implants by means of a transmucoperiosteal(More)
Over a period of 18-48 months, the bone resorption, or bone deposition (osteogenesis) of the mandible, in the supero-inferior dimension, was evaluated in patients who had had implanto-orthognathic reconstructive surgery (IORS). It entails the combination of three different types of surgical involvement for the reconstruction of the atrophic (class V), and(More)
A pedicled musculo-mucocutaneous "flap" derived from an original tongue flap is used as one of the layers for the double-layered closure of a recurring oro-nasal fistula. The other layer used for the closure, namely the nasal "flap" layer, originates from the adjacent palatal mucoperiosteum. The oral pedicled "flap" layer and the nasal "flap" layer form the(More)
When a treatment planning system uses an empirical or semianalytical approach to describe the influence of a wedge filter on a photon beam, a number of experimentally determined parameters are required. These may be found from direct measurement. However, if the beam model is sensitive to the parameters, it will be necessary to optimize the parameter values(More)
The extent of the naso-maxillo-acro-dysostosis involvement differs in each case. The three cases presented in this paper all had different orthodontic and surgical treatment approaches according to the individual involvement of the nose, maxillae, mouth and other facial features.
An inexpensive system for obtaining cross-sectional information and accurate body outlines of patients destined for radiotherapy, using a radiotherapy simulator without any major modifications, has been investigated. The image intensifier of the simulator was moved laterally and a narrow fan beam of X-rays passed through the phantom onto the intensifier.(More)
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