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Biomedical subjects

M Y Mommaerts

Publications and source records attributed to M Y Mommaerts.

54 records · Page 3Linked to original sources
PubMed1995

Rhinoplasty with nasal bone disarticulation to deepen the nasofrontal groove. Experimental and clinical results.

Deepening of the nasofrontal groove is considered a fiddly task. The unwonted chisel ostectomy technique (Skoog, 1974; McCarthy, 1990; Aiach and Levignac, 1991) was therefore modified and evaluated both experimentally and clinically. The hump is removed in one piece together with the nasal bones up to the horizontal part of the frontonasal suture. To accomplish this, the reduction osteotomy has to be performed in a wave line fashion. The depth of resection in the sellion area depends upon the aesthetic planning. In cases with most severe hypertrophy, the osteotome enters the vertical frontonasal suture behind the nasal bones and in front of the nasal spine of the frontal bone. The nasal bones are disarticulated with a levering movement. Cadaver studies demonstrate the safety of the technique: no fracture lines were detected in the frontal process of the maxilla, ethmoid, frontal or lacrimal bones, by either clinical inspection, or by standardised radiological examination. The clinical cases show a convincing outcome.

Female↗
PubMed1994

Evaluation of the slot osteosynthesis technique in mandibular advancement. With focus on occlusion and lower lip sensibility.

The slot osteosynthesis technique (SLOT) was evaluated in 25 mandibular advancements. SLOT was successfully used to readjust skeletal and occlusal malpositioning in 48% of the cases. Neurosensory tests in the lower lip and chin region revealed a low disturbance rate (immediately postsurgery 20% of patients, at 7 months 8%). This may be due to the specific splitting and fixation techniques applied.

Adolescent↗
PubMed1994

Condylar resorption in orthognathic surgery: a retrospective study.

A retrospective study was performed to examine the occurrence of condylar atrophy in connection with orthognathic surgery. Patients with high-angle mandibular deficiency (n = 29) were selected from among those who underwent bimaxillary osteotomy (n = 93) during the period from January 1987 through December 1990. This group of 29 was examined for shortening of the ascending ramus of the mandible because of condylar resorption. In 9 of these 29 (31%), the ramus had resorbed more than 2 mm, or more than 6% of the total length of the ramus. All 9 of these patients were female. There was no correlation between resorption and age, the amount of retrognathism, or the presence of preoperative temporomandibular joint dysfunction. Female patients with high-angle retrognathism should be informed of the possibility of postoperative condylar resorption and should be followed with radiographic controls for at least 2 years after surgery.

Adolescent↗
PubMed1994

The use of skull bone in maxillofacial reconstruction and its potential use in orthopedic surgery.

The calvarium provides a source of bone grafts that are widely applied in maxillofacial surgery, with minimal donor-site morbidity and less resorption than endochondral grafts. A technique of harvesting monocortical bone is described and possible indications in orthopedic surgery are proposed. Thus, we suggest that skull bone can be used in orthopedic surgery in some instances, resulting in less donor-site morbidity than when autogenous bone from other sources is used.

Facial Bones↗
PubMed1993

[Primary correction of lip and nose abnormalities in complete unilateral cleft. 1: Lip reconstruction].

This first part of an article on primary repair of the unilateral cleft lip and nose is dealing with the lip deformity. A differentiated labial and nasal muscle reconstruction is as important as an esthetic skin closure. A symmetrical bone platform and a limited tissue defect are ideal conditions for the definitive lip repair. The combination of a lip/nose adhesion and a growth guidance plate is able to create these conditions in a period of four months.

Cleft Lip↗
PubMed1992

Two similar "bad splits" and how they were treated. Report of two cases.

Two high fractures of the proximal segments during separate sagittal split osteotomies were treated by a modification of the "Obwegeser II" technique and screw osteosynthesis. Careful wedging of the large spreading osteotome in a more superior position while splitting up to the posterior border will probably prevent such complications.

Adolescent↗
PubMed1991

Slot osteosynthesis technique (SLOT) for sagittal ramus split osteotomies. A method to optimize occlusal control and condylar seating.

In the technique presented, a specially designed drill and bone holding forceps are used. These enable a horizontal slit to be cut in the condyle-bearing segment, at the site of the largest contact surface. One lag-screw is tightened in the centre of the slit at each side. By releasing the IMF (intermaxillary fixation) and untightening one or both screws, the condylar segments can be repositioned and the occlusion corrected before inserting the other tandem screws.

Bone Screws↗
PubMed1991

Lag screw versus wire osteosynthesis in mandibular advancement.

The records of two homogeneous groups of mandibular advancement patients were selected from the 1961 to 1985 files of the Department of Maxillofacial Surgery, University of Zurich. The groups were differentiated by the osteosynthesis technique: lag screw or wire. The preoperative, short-term postoperative, and 1-year postoperative lateral cephalograms of both groups were subjected to the same digitizing procedure and statistical analysis. The mean sagittal relapse of 11% in the rigid osteosynthesis group was not statistically significant, whereas the wire fixation group experienced mean regression of 45% at pogonion after 1 year.

Adult↗
PubMed1990

Positional changes after mandibular advancement by sagittal split osteotomies and wire osteosynthesis. Do combined orthodontics and the Dal Pont modification of the buccal osteotomy contribute to long-term stability?

Thirty-five cases of sagittal split ramus osteotomies with wire osteosynthesis as the exclusive procedure used to correct a dentoskeletal Class II deformity, were selected to form a homogeneous group for cephalometric evaluation of the short- and long-term, skeletal and dental changes. The group was statistically described as having severe micromandibulism, mild micromaxillism and mild dento-alveolar maxillary protrusion. The skeletal relapse within the first postoperative year was due to horizontal and dorsocranial rotational changes of the tooth-bearing segment. The joint-bearing segment rotated ventrocranially. As an overall result, the mandibular body was not lengthened but advanced. The relapse at the occlusal level was considerably less, partly due to the rotational component of the skeletal relapse mechanism, partly due to the compensating retroclination of the upper anterior teeth. With the condyles correctly repositioned at surgery, no relationship could be found between postoperative changes in condylar position and skeletal relapse. There was no difference in the average amount of skeletal relapse between the subgroup with the Dal Pont modification of the buccal osteotomy and the subgroup with the buccal osteotomy directed to the mandibular angle. The average skeletal relapse was greater in the combined surgical orthodontic cases, due to increased alveolar tooth mobility.

Adolescent↗
PubMed1988

Late loco-regional recurrences after radical resection for mandibular ameloblastoma.

5 cases of mandibular ameloblastoma are described with multiple recurrences after a long period of time. 4 of them were primarily treated by radical resection. 1 was initially treated by enucleation and extensive resection was performed only after its recurrence. The invasive growth of the recurrent tumor into the soft tissues and the cranial base, necessitating extensive ablative and reconstructive surgery, reflects the potential aggressiveness of this tumor. It is therefore recommended, to plan an adequate resection in cases of multicystic ameloblastoma, which includes a margin of at least 1 cm, of apparently non-invaded bone. If the tumor has eroded through the cortical bone and invaded into the soft tissues, wider margins are necessary to eliminate possible tumor extensions that are left behind. Adequate follow-up on a regular basis should enable the clinician to detect early recurrence so as to avoid major surgery.

Aged↗
PubMed1987

A cephalometric analysis of the long-term, soft tissue profile changes which accompany the advancement of the mandible by sagittal split ramus osteotomies.

Thirty-five cases of mandibular advancement using the sagittal split ramus osteotomy technique were evaluated by retrospective cephalometric analysis of the long-term soft tissue profile changes. The cases were selected to form a homogeneous group. Soft tissue Pogonion and soft tissue B followed the respective hard tissue points in a nearly one-to-one ratio. Soft tissue Menton followed hard tissue Menton vertically, also in a nearly one-to-one ratio. The change in angle and depth of the labiomental fold correlated well with the vertical change of Menton, but not with the sagittal change of Pogonion. The mean values, ratios and regression equations in this study form a solid data base for long-term prediction.

Adult↗
PubMedDate not supplied

Assessment of the damages by orbital blow-out fractures.

Recent developments of medical imaging such as CT scanning with three dimensional reconstruction (3D-CT) and magnetic resonance imaging (MRI), have had a profound impact on the diagnosis of maxillo-facial trauma, including orbital blow-out fractures. The authors discuss the pathology of orbital blow-out fractures, the current views concerning the etiopathogenesis and nowadays clinical and technical investigations. Some important aspects of the assessment of the physical damages according to the Belgian law are discussed.

Diplopia↗
PubMedDate not supplied

Coronal suture transplantation to correct fronto-orbital constriction in metopic synostosis.

Surgical correction of non-syndromatic trigonocephaly is generally considered to be ideally performed at the age of 3 to 6 months. Conventional procedures include flattening of the forehead and straightening of the supraorbital bar by multiple osteotomies. Hypotelorbitism is generally not addressed. Long-term follow-up studies have shown that the orbital configuration does not improve spontaneously. Recently, some centres have proposed simultaneous correction of hypotelorbitism by a median widening osteotomy in the supraorbital bar. In our opinion, these procedures are indicated for patients over the age of 2 years, since further transverse growth is restricted by the plates and bone grafts in the glabella region. A procedure is presented by which both the initial and presumably the long-term correction of the transverse constriction in the forehead, glabella and orbital region is safeguarded by midline transplantation of a suitable piece of coronal sutural area.

Constriction, Pathologic↗