[Radiologic pitfalls of mandibular fractures].

Analysis of a large series of patients treated for mandibular fractures showed pitfalls in assessment of radiologic images in six cases. Factors predisposing to these radiologic pitfalls are discussed, multiple radiographic projections being suggested if discordance exists between radiologic and clinical findings, to obtain maximum data from a three dimensional picture of the mandible.

[Mandibular fractures. Our patient enrollment during the past 2 years].

The method of patient referral; the patient's physical predisposition, the localization and the treatment undertaken for the different mandibular fractures seen by SOS Face over the past two years were analyzed. The 312 mandibular fractures were used to reevaluate the commonly accepted statistics concerning these parameters.

Paragangliomas of the head and neck. Immunohistochemical analysis of 16 cases in comparison with neuro-endocrine carcinomas.

Sixteen cases of paragangliomas of the head and neck including 8 of the vagal body, 3 of the carotid body, 2 jugulotympanic, 2 vagal or jugulotympanic and 1 of the larynx were analysed. Clinically, 13 tumors were benign, 2 showed local aggressivity and 1 showed metastases. All tumors were tested with antisera directed against neuron-specific enolase (NSE), chromogranin A (CGA), S-100 protein, neurofilaments (NF), glial fibrillary acid protein (GFAP) and cytokeratin (CK).

[Anatomo-radiological study of edentulous jaws prior to implant placement].

In the case of a total loss of teeth, a conventional understanding of descriptive anatomy is no longer sufficient. It does not take into account: The principles of osteo-architecture allowing the distribution of different types of bone structure (Haversian, spongy, papyracious) to be understood; The mechanisms of bone resorption; The new anatomical relationships created by such resorption.

[Criteria for choosing an endosseous implant. Clinical and fundamental results concerning sintered ceramic implants].

In our opinion, the primary criteria are: absence of severe residual lesions in case of failure of the implant, implant material with demonstrated biocompatibility and which does not interfere with modern medical imaging techniques (CAT-scan, NMRI); ceramics meet this criteria, an implant morphology allowing for perfect initial stabilization, sparing of tissue and good distribution of transmitted forces to bone, an easy, accurate and nontraumatic implantation technique, the possibility of connecting the implant to fixed or movable structures by precision prefabricated accessories, dismantlable if possible, convincing animal experiments and clinical results in large series with a follow-up of more than 10 years.

[Restoration of the alveolar crest with a biomaterial filler. A clinical and histological study].

The implantation of biocompatible hydroxyapatite is used for human mandibular ridge augmentation in edentulous patients. Histologically, we studied such a material after a long period of implantation (1 1/2 to 2 years) in two patients. The histologic study showed a narrow meshed net of collagen tissue surrounding the hydroxylapatite particles.