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Biomedical subjects

K de Man

Publications and source records attributed to K de Man.

10 recordsLinked to original sources
PubMed1991

Influence of age on the management of blow-out fractures of the orbital floor.

This study concerns 50 patients with blow-out fractures of the orbital floor, including 15 children, and was designed to evaluate the influence of age on clinical presentation and postoperative results. Fourteen of the 15 children were found to have a trap-door fracture. This type of fracture was not found in adults, who usually present with a large "open-door" fracture. In trap-door fractures, orbital tissues are liable to become trapped and even strangulated. It is therefore suggested that young patients with severely restricted eyeball motility, an unequivocal positive forced duction test, and findings indicating blow-out fracture of the orbital floor on CT, should undergo operative treatment as soon as possible after injury. A "wait and see" policy, keeping the patient under observation, seems to be appropriate for blow-out fractures in adults. Surgical treatment is recommended only in those adult patients who demonstrate impairment of vertical eyeball motility within the mainfield of view after the haemorrhage and oedema have resolved and in whom change in motility is no longer seen and Hertel measurements have stabilized.

Adolescent↗
PubMed1990

Bimaxillary hyperplasia: the facial expression of homozygous beta-thalassemia.

A boy born in Curaçoa, who was 6 years old at his initial visit and known to have homozygous beta-thalassemia, is described. Emphasis is directed to the typical facial expression. The possibility of surgical treatment of the maxillary hypertrophy is discussed. However, in view of the limited life expectancy of these patients, correction should not be performed before adolescence.

Bone Marrow↗
PubMed1990

CT diagnosis of synovial chondromatosis of the temporomandibular joint.

Synovial chondromatosis of the temporomandibular joint (TMJ) is a very rare condition. It is characterised by the presence of loose bodies in the joint space. Clinical signs, histopathological findings and radiography play an important role in the diagnostic process. Conventional X-rays have shown to be of limited value, for they fail to depict the intra-articular loose bodies in a significant amount of cases. Axial as well as coronal computer tomography (CT) is extremely useful in detecting loose bodies in the temporomandibular joint (TMJ). In this report we present and discuss a further case, and the use of CT in the diagnosis of TMJ-synovial chondromatosis is illustrated.

Chondromatosis, Synovial↗
PubMed1988

Carotid-cavernous sinus fistula following maxillofacial trauma and orthognathic surgery.

The presence of a carotid-cavernous sinus fistula after maxillofacial trauma or orthognathic surgery is uncommon. 2 patients are described who developed a carotid-cavernous sinus fistula. Early diagnosis is important, since delay in treatment may cause irreversible neurological and/or ophthalmological damage. The etiology of the carotid-cavernous sinus fistulas is discussed, in the cases described.

Adult↗
PubMed1987

Sarcoidosis with maxillary involvement.

A case of sarcoidosis with maxillary involvement is presented. The patient complained of loose teeth in the upper anterior region, while radiographs revealed a poorly defined radiolucent area round the midline of the anterior maxilla. The diagnosis was verified by histopathologic examination.

Adult↗
PubMed1984

Fractures of the orbital floor: indications for exploration and for the use of a floor implant.

Fractures of the orbital floor are frequently treated by exploratory surgery and by the insertion of a floor implant, because of the possibility of late diplopia and enophthalmos. The findings of this study would suggest that this fear is not justified and that there is no indication for an early diagnostic exploration of the fractured orbital floor, if there are no clinical or radiological signs of orbital floor fracture within 14 days of the accident. The significance of the status of the periorbita in the method of treatment of the fractured orbital floor is stressed. The suggestion is made, contrary to what is generally found in the literature, that a linear or a comminuted floor fracture and an orbital floor with a defect do not require a floor implant, if the periorbita is intact.

Eye Movements↗
PubMed1978

Antigenic properties of Bioplast.

The influence of heat treatment (at 150 +/- 2 degrees C for 2 hours) on the antigenicity of human Bioplast fibrin powder and human fibrin Bioplast plates was tested in an experimental study. Untreated and heat-treated fibrin powder with incomplete Freund's adjuvant was subcutaneously injected in rabbits. In addition, untreated and heat-treated plates, to which incomplete Freund's adjuvant was added, were subcutaneously implanted. A booster dose was given 8 weeks after the start of the experiment. Blood samples were collected up to 4 weeks after the second injection or implantation, and the sera were tested for precipitating antibodies by the double diffusion technique (OUCHTERLONY'S method). Unlike previous investigators, we found antibodies in sera from rabbits injected or implanted with heat-treated Bioplast products. Thus, the claim that the antigenic properties of all kinds of fibrin can be fully eliminated by heat treatment does not appear to be tenable. In order to avoid the risk of sensitization in man, it is probably advisable to use only human fibrin for the production of Bioplast fibrin powder and Fibrin Bioplast plates for clinical use in human beings.

Animals↗