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Biomedical subjects

M Champy

Publications and source records attributed to M Champy.

At least 19 recordsLinked to original sources
PubMed1992

[Osteosynthesis using resorbable plates in maxillofacial surgery: hopes and disappointments].

The use of absorbable osteosynthesis material has two advantages in maxillofacial surgery: suppressing the possible biological effects of implanted metallic foreign bodies, making second surgery for material removal useless. Although the biotolerance of currently used materials is well known, the authors intended to test their use in the specific conditions of maxillofacial surgery, in which simply extrapolating the data collected in general surgery leads to erroneous conclusion. The authors report the results of a preliminary clinical study on 21 cases of osteosynthesis of the upper third of the face using absorbable plates (18 fractures of the zygomatic bone, 3 maxillary osteotomies). The biotolerance of the material is very good, after more than 3 years for the oldest cases. The mechanical stability of the assembly is sufficient for the selected indications. As regards disappointments, these include the thickness of the plates, the difficulty to adapt them to bony surfaces, the fragility of the screws and the slow resorption of the material.

Biocompatible Materials↗
PubMed1992

[Value of interrupted resection of the lateral crus in surgery of the nasal tip].

Three goals have to be achieved in the surgery of the tip of the nose. Separately or joined together, they contribute to modify the height, rotation or width of the tip. Interrupting resection of the upper legs gives the ability to modify both the projection and the rotation of the tip. The authors present this technique, emphasizing the precise location of the knee of the upper legs and the interest to perform interrupting resections laterally to this region.

Esthetics↗
PubMed1992

[Whose nose?].

Explore the source record for details and available documents.

Adult↗
PubMed1991

[Carcinoma cuniculatum. Apropos of 4 cases with orofacial involvement].

Carcinoma cuniculatum, a rare variant of verrucous carcinoma, was first described in the foot. The authors report 4 cases of uncommon localizations of this tumor, involving oral cavity and face, 3 of them having a 6-year follow-up. The specific histological and clinical features of this tumor are remembered and the difficulties of its diagnosis are emphasized. This slow-growing, ulcerated proliferation, invading the surrounding tissues, is often responsible for chronic suppuration, but very rarely metastasizes to the regional lymph nodes. The surgical treatment consists in a wide excision; neck dissection is theoretically useless, and radiotherapy is strictly contraindicated because of the risk of transformation into an anaplasic carcinoma. For all these reasons, carcinoma cuniculatum must be considered as an anatomoclinic entity, and deserves to be known by the clinicians and the pathologists.

Carcinoma, Papillary↗
PubMed1989

Is the myosin type altered in the aging platysma?

The myosin light chains of platysma samples originating from 2 to 86 year old patients of the maxillo-facial surgery clinic were investigated. The platysma contained both fast and slow myosin. No change in the proportion of myosin type in relation to age was found. Female patients often displayed less fast myosin than male patients. Each time when the platysma muscle activity has been reduced a decrease in the amount of slow myosin light chains was observed. In the reported study, variations of the fast and slow myosin light chains resulted mainly from the platysma activity level, i.e. from the pathology requiring the surgery, rather than from the patients' age.

Adolescent↗
PubMed1989

[Surgical treatment of hypoplasia of the ascending ramus of the mandible in children using an autologous osteochondral costal graft].

To lengthen the child's mandibular ramus, we use, since 1977, an autologous osteochondral rib graft fixed to the posterior margin of the ramus. Experimental studies show that this graft has a growth potential, the osteochondral junction responds to the biomechanical forces in a similar way to the mandibular condyle. Surgical treatment allows an immediate restitution of the morphology, normal masticatory function and good buccal opening. The interposition of cartilage prevents recurrence. The growth potential of the graft due to osteochondral junction activity, allows surgery to be performed in childhood, without requiring a further surgical operation several years later. This constitutes an optimistic prospect for the future and the good results obtained with 8 patients are analyzed.

Bone Lengthening↗
PubMed1978

Mandibular osteosynthesis by miniature screwed plates via a buccal approach.

The modified Michelet's (1973) technique of mandibular osteosynthesis, which consists of monocortical juxta-alveolar and sub-apical osteosynthesis, without compression and without inter-maxillary fixation, is described. This technique can be used in many types of mandibular fracture, single or multiple, associated or isolated, except in the case of a fracture of the condylar neck and in the presence of pre-existing infection. Infected fractures are treated by orthopaedic methods. Materials used (plates and screws) and particulars of the method have been tested by multi-disciplinary experimentation, particularly by anatomical verification and biomechanical studies. The ideal line of osteosynthesis is described. For the author, this technique is a routine treatment of any type of mandibular fracture.

Bone Plates↗