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Biomedical subjects

J P Deffez

Publications and source records attributed to J P Deffez.

At least 19 recordsLinked to original sources
PubMed1992

[Occurrence of post-traumatic temporo-mandibular ankylosis. Trial of classification of anatomo-pathologic lesions].

According to the authors, who have an 18-year experience, the treatment of temporomandibular ankylosis in children consists in the resection of the ankylosis block and of the corresponding neck of the condyle, along with the preservation of the capsule and articular disk and a dynamic blockade with the mouth open until the mandibular condyle is completely reconstructed. After witnessing the constitution of ankylosis in a child who was initially examined 3 weeks after the trauma, we were able to carry out a thorough clinicopathological examination of the areas of tissue characterizing incipient ankylosis, both in the condylar cartilage and in the underlying bone. The initial stage produces the progressive emergence of the bony surfaces, which then bear no cartilage. This is osteogenesis as well as cartilage resorption, as evidenced by the presence of neoformed Haversian canals at that level. This is a formal argument in favor of a systematic dynamic blockade with the mouth open in all cases of fresh condylar surface and the menisceal surface of the joint is the best way to prevent ankylosis or malunion.

Ankylosis↗
PubMed1991

[Dynamic bite block in fractures of the mandibular condyle and following surgery of temporomandibular ankylosis in children].

Early mobilization is the rule in cases of fracture and temporomandibular joint surgery. When prematurely discontinued, it may sometimes prove insufficient to prevent temporomandibular ankylosis in the child. Blockade in the open-mouth position is in keeping with an important general orthopedic rule, i.e., immobilization of joint fractures in position of function (ankylosis is loss of function, and is reflected by the child's inability or limited capacity to open his/her mouth). Continued night wear of re-habilitation devices, once consolidation is acquired, affords active joint mobilization during meals that is sufficient owing to the strength of the elevator muscles (five times than of the depressors).

Ankylosis↗
PubMed1991

[Lingual-mandibular remodeling resection in prognathism].

The combination of --hypoplastic upper jaw, with narrow soft palate, --glossoptosis (or low, propulsive tongue), associated with protrusion of lower jaw, is well known. Early, exclusively orthopedic management combines enlargement of the superior arcade; functional/postural re-education of the tongue. Surgical management comes in later; it associates modeling resection of the tongue intended to position the tongue against the palate, with Chevron's mandibular resection, suppression of the first premolar, and salvaging the mental nerve. This type of osteotomy is indicated whenever a 6 to 8 mm mandibular retrusion is required. Fixation is monomaxillar, via extemporaneous splinting, associated with low external cortical osteosynthesis. The latter allows for gain of motor activity as early as the second day post-surgery.

Adolescent↗
PubMed1989

[The systemic environment and dental development. From the clinical to the molecular approach].

Clinical observation of patients with disordered phosphocalcium metabolism has demonstrated that dyschromia and/or dental dysplasias systematically accompany such disorders. A certain action of this steroid on dental buds has been demonstrated after analysis of the effects of experimental vitamin D deficiency in the rat: vitamin D would seem to control the behaviour of cells undergoing differentiation and also after this process is complete. Dentinogenesis and amelogenesis would appear principally to be affected. Two proteins, calbindins D-9K and -28K, may constitute the molecular mediators of this ameloblastic regulation.

Animals↗
PubMed1989

[Cauhépé-Fieux syndrome. Interception in the deciduous dentition of mid-face hypoplasia].

Inadequate transverse development of the milk dentition alveolar arcade (Cauhepe-Fieux syndrome) may have important effects on the constitution of facial architecture and in the medium term require orthognathic surgery. The acquisition of dental arcade contact on deglutition is only possible after normalization of the dimensions of the arch of the palate. The recommended suture inducing prosthesis should obligatorily include intercalating molar plates designed to overcome inadequate occlusion during treatment (on average 9 months). Both stimulation of growth at the level of the intermaxillary suture in this age group, and the stability of the results obtained, have been demonstrated after a period of follow up of more than 10 years taking into account the cybernetic aspects of the studies carried out by Professor Petrovic.

Child, Preschool↗
PubMed1988

[Genioplasty in adolescence].

Different possible types of genioplasty in adolescence are envisaged: pure subtraction, conjugated subtraction, apposition, addition and in particular transfer for correction of the facial asymmetry of temporomandibular ankylosis sequelae. It is difficult to predict results and it is necessary to remain within a known framework in which esthetic and psychologic demands must occupy a very important place.

Adolescent↗
PubMed1986

[Capdepont dysplasia and vertical excess of the lower half of the face. Genetic syndrome or fortuitous association?].

The study of an Algerian family revealed that four of the seven children presented dentinogenesis imperfecta associated with an anomaly of the facial skeleton (maxillary hypoplasia, anterior expansion of skeletal origin due to widening of the angle of the gonion). This type of association and its very unusual type of transmission (no doubt recessive) leads to a discussion of genetic mechanisms of these syndromes.

Child↗
PubMed1985

[Lingual vascular malformations, their consequences on the growth of the inferior facial plane. The integration of orthodontic embolization].

Lingual vascular malformations are usually benign, but have repercussions on the growth of the maxillo-mandibular unit in the child. The improvement in the vascular problems at puberty leads the authors to prefer a conservative form of treatment, hence the important role of embolization techniques. These techniques should be followed by the fitting of a lingual guide appliance, similar to the "mono-block" designed by Pierre Robin. This orthesis forces the child to modify incorrect movements due to the volume of the angiomatous tongue and gradually teaches him to automatize the new motor images created based on the dynamics of a virtually normal tongue, within the 6 months following embolization.

Activator Appliances↗
PubMed1985

[Preoperative potentiation of immune defenses or postoperative antibiotic therapy?].

A clinical study was conducted during the postoperative period in adolescents to compare efficacy of two regimens by objective (temperature, edema) and subjective (pain) criteria. half had received preoperative immunotherapy and the other half conventional postoperative antibiotic treatment. Operations were germectomy of a wisdom tooth and maxillary osteotomy. Results were submitted to statistical analysis and data obtained from the objective and particularly subjective parameters studied led to the routine introduction of preoperative immunotherapy for these operations.

Adolescent↗