Bodil Rune

Tooth Size and Tooth Formation in Children with Advanced Hypodontia

Abstract No Abstract Available. From the Department of Orthodontics, Public Dental Health Service, and The Maxillo-Facial and Cleft Palate Center, University Hospital, Malmo, Sweden.

Roentgen stereometry with the aid of metallic implants in hemifacial microsomia.

Displacement of the mandible and the maxilla with growth in relationship to the frontal bone was recorded in eleven children with hemifacial microsomia, aged 3 to 14 years at the initial examination. The goals were to assess the efficiency of the method for accurate recording of articular growth and to obtain information on facial development in each of these children. Correction of the skeletal asymmetry was not attempted during observation periods of from 707 to 1,484 days. In continued observations three of the children were treated with functional appliances. Roentgen stereometry with the aid of metallic implants proved to be an efficient method for highly accurate recordings of articular facial growth in relationship to the frontal bone. Displacement of the jaws was asymmetrical in all of the examined children as determined in the frontal and transverse planes of the head. In about 50 percent of the children the degree of asymmetry increased in one plane while it decreased in the other plane. No correlation was found between the extent of the mandibular deformity, as seen on orthopantomograms, and the displacements of the mandible. Generally, the displacement of the maxillary bones corresponded with the displacement of the mandible. Articular growth of the jaws was redirected toward a more favorable pattern in two of the children during the time they used a functional appliance. In the third child the use of a functional appliance had no such effect.

Condylar displacement after oblique sliding osteotomy of the mandibular rami

Condylar displacement after oblique sliding osteotomy was examined in 8 patients by X-ray stereometry and plain radiography. During the first 8 postoperative weeks the displacement was in a medial/superior/posterior direction. After removal of the intermaxillary fixation a continuous lateral translation was found together with an initial inferior and a minor anterior translation which after 6 months postoperatively changed to a posterior translation. At 12 months postoperatively a difference in findings of condylar position was found between the X-ray stereometric and plain radiographic analyses. We regard this difference as due to the sum of remodelling and method errors.

Hemifacial microsomia treated with the Herbst appliance: Report of a case analyzed by means of roentgen stereometry and metallic implants☆

The effect of Herbst appliance treatment on facial growth of one patient was recorded in terms of displacement of the mandible and the maxillary bones in relation to the frontal bone. The recordings were made with an accuracy of 0.1 degree and 0.05 mm. (S.D.). Before treatment the jaws were displaced posteriorly and to the affected side with growth, increasing the degree of retrognathia and facial asymmetry. During treatment facial growth was redirected and the jaws were displaced anteriorly and to the unaffected side, decreasing th degree of retrognathia and asymmetry. At the same time, however, the tilt of the mandible to the affected side was increased, possibly because of the morphologic and functional conditions of the jaws in hemifacial microsomia. The dental malocclusion was corrected partly through displacement of the jaws and partly through dentoalveolar adaptation.

Displacement of themandible during intermaxillary fixation after oblique sliding osteotomy. A stereometric and cephalometric radiographic study

The X-ray stereometric method was applied for the first time to a series of consecutive patients to record operative repositioning of the mandible during oblique sliding osteotomy and postoperative displacement of the mandible during intermaxillary fixation. Comparison with cephalometric measurements was presented. The operative repositioning pattern was presented. Postoperatively a posterior displacement pattern was found with incisor extrusion in both jaws. Correlation between operative repositioning and postoperative displacement and between the two measurement methods was assessed. The stereometric method offers information on displacement on all three planes and a higher degree of accuracy. To avoid incisor extrusion, besides intermaxillary dental fiscation also skeletal fixation is recommended.

Changes of the Profile After Advancement Genioplasty

Surgical advancement of the chin, and postoperative relapse, were studied during a three-year period in 17 patients. Changes were measured on lateral cephalograms obtained at certain intervals. Sagittal skeletal changes were recorded parallel to the Frankfort Horizontal plane. Soft tissue changes were recorded by advancement of soft tissue Pogonion along a line parallel to the mandibular base line and by the increase of the angle NFL/NCL. The average skeletal advancement was 8 mm with a relapse of 1 mm two months after surgery. No further changes were registered during a three-year observation period. The average soft tissue advancement was 7.5 mm from two months after surgery and no relapse was found after this time. The soft to hard tissue ratio of the changes was 0.94 which corresponds to results reported in the literature. There was no correlation between the average amount of advancement and the amount of relapse. The range of changes showed a wide variation, however.

Movement of maxillary segments after expansion and/or secondary bone grafting in cleft lip and palate: A roentgen stereophotogrammetric study with the aid of metallic implants

The study was undertaken to examine the effects of expansion treatment and secondary bone grafting in cleft lip and palate. Movement of the lateral maxillary segments in four patients with complete bilateral cleft lip and palate (BCLP) was complicated and asymmetric, and a greater relative widening of the dental arch was observed. The least expansion was found in the oldest patient. Bone grafting did not bring about a stable relationship between the segments. The width of the dental arch was mostly maintained despite segmental movement. In one patient with unilateral cleft of the lip and primary palate (UCL) growth in the midpalatal suture followed the pattern observed in noncleft patients but was less extensive. Accurate and comprehensive recording of the relatively small maxillary movements requires that implant stability is checked and that a reference is established outside the maxilla.

bone Grafts to the Nose in Binder's Syndrome (maxillonasal Dysplasia): A Follow-up of Eleven Patients with the Use of Profile Roentgenograms

&NA; Bone grafts are used to lengthen the dorsum and elevate the tip of the nose in patients with Binders syndrome. Disappointing long‐term results in some patients generally have been assumed to be a result of resorption and/or displacement of the grafts. Treatment outcome was studied in 11 patients with the use of serial profile roentgenograms. At 40 months, the mean values after surgery were reduction of the initial transplant length by 28 percent and reduction of the transplant angle by 4 degrees. The initial nose length was increased by 1 mm, and nose tip projection was increased by 2 mm. Although the mean changes of nose length and nose tip projection seemed small, treatment outcome varied considerably between patients. In contrast with earlier assumptions, no correlation could be found between the degree of transplant resorption and/or displacement and the effect of surgery on nose length and nose tip projection. (Plast. Reconstr. Surg. 101: 297, 1998.)

Roentgen Stereophotogrammetry Applied to the Cleft Maxilla of Infants: I. Implant Technique

A new roentgen stereophotogrammetric method was developed for the study of the kinematics of the skeletal system. Based upon the use of metallic implants, this method determines the relationship between the implants as well as the change in position between skeletal segments provided with implants. The object and its positional changes or motion are reconstructed from two roentgenograms with the aid of photogrammetric principles and computer technique. The method requires insertion of three or more implants in each skeletal segment. When the implants remain in a stable interrelationship during the observation period a rigid-body model is obtained. In the analysis this represents the segment and motion is computed according to the kinematics of a rigid body. The present study is concerned with early establishment of rigid-body models in the segments of a cleft maxilla (part I) and registration of postoperative motion between the segments (part II). The experimental set-up consists of two X-ray tubes (0.6×0...

Posteroanterior traction in maxillonasal dysplasia (Binder syndrome): A roentgen stereometric study with the aid of metallic implants☆

The study was undertaken to examine the effect of posteroanterior traction in an 11-year-old boy with maxillonasal dysplasia. Movement of the maxillary bones and of the mandible was recorded, by means of roentgen stereophotogrammetry, in relationship to the frontal bone during and after treatment. In the examined child face-mask therapy mainly influenced the position of the mandible while the recorded advancement of the maxillary bones was slight (0.6 mm.). It is possible that the limited maxillary response to traction may be due to insufficient growth capacity of the circummaxillary sutures in a child with maxillonasal dysplasia. While movement of the maxillary bones and of the mandible during traction conformed with the pattern of treatment effect described by Delaire a total maxillary relapse occurred in the posttreatment observation period (no retention), possibly in adaptation to the retropositioned mandible. In our patient, posteroanterior traction accomplished improvement of the maxillary retrusion in relationship to the mandible only.