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PubMed1983

Comparison of two methods of profile prediction in surgical treatment of mandibular prognathism.

Two methods for prediction of the soft tissue profile subsequent to oblique subcondylar osteotomy for correction of mandibular protrusion were evaluated. The first one included distalization of the mandible into an Angle Class I relationship. The amount of distalization and any vertical changes were transferred to the tracing, and the anticipated new profile was drawn. The second method was based on the profile means of a group of "normal" persons and was aimed at correction of both sagittal and vertical discrepancies. Fifty patients were studied. A double set of prediction tracings was made according to both methods; and the results were compared with the actual postoperative results and with a "normal" control group. Both methods were usable, as the predictions were considered satisfactory if they were within one standard deviation from the mean of the control group. The sagittal changes were somewhat exaggerated by both analyses. The vertical changes were much better expressed by the profile prediction. Such changes are difficult to create by the vertical subcondylar osteotomy. Consequently, the model prediction seems most suitable for planning profile changes in surgical techniques that include mobilization of one main mandibular fragment.

Adult↗
PubMed1978

Long term follow-up of the sagittal splitting technique for correction of mandibular prognathism.

In a study of 67 cases the authors have investigated clinically and radiologically the long term results (5 years and over) of the sagittal split technique (Obwegeser 1955, 1957). Although 95% of the patients are satisfied, 60% have some impairment of sensation in the lower lip. This however goes unnoticed in 40% of these cases. The temporo-mandibular joint does not appear to be affected. 73% of the patients have excellent or good occlusion, while 18% have an unsatisfactory anterior occlusion due to some degree of relapse. The remaining 9% have poor occlusion without sign of relapse. A statistical analysis of the teleradiographs reveals that relapse is due to a rotation of the body of the mandible. Since several changes in technique have meanwhile been adopted, this paper will be followed by an analysis of the more recent cases.

Adolescent↗
PubMed1984

Position of anterior teeth following surgical correction of prognathism.

20 patients who had all undergone surgical correction of progenia by sagittal split operation in the ascending ramus were chosen for a follow-up investigation 5 years after the operation. The patients could be divided into two groups showing either horizontal or vertical facial growth pattern. A cephalometric analysis was made of all the patients and the results of both groups were compared with one another. In particular the changes in the position of the anterior teeth and the amount of sagittal and vertical relapse were noted. It was noticed, that the type of measurable postoperative relapse was different in the two groups. Postoperative mandibular relapse is partially compensated by the position of the anterior teeth. Therefore the postoperative changes in the position of the anterior teeth are different in the two groups.

Cephalometry↗