Abstract
Objectives: In the first place, to evaluate skeletal changes of the maxilla and mandible induced by surgical-orthodontic correction of malocclusions class III with long-face syndrome and secondly, to analyze the stability of these skeletal changes in the long term (more than 6 years). Design of Study: A retrospective, unicentric and longitudinal study of 19 patients who had undergone surgical and orthodontic therapy for class III skeletal malocclusion with long-face syndrome was undertaken. A cephalometric analysis based on 8 angle measurements, and statistical analyses at three different points in time (before orthodontic treatment, after orthognathic surgery and after a retention period of at least 6 years) were carried out. Results: The changes produced following surgery show that, with the exception of the maxillary plane and the facial axis, all other variables presented changes of great statistical difference. Conclusions: Skeletal changes after orthodontic-surgical correction present maxillary advance, mandibular regression and mandibular anterorotation. The angles that represent the mandibular vertical position (ramus angle, goniac angle and mandibular plane angle) showed statistically significant relapses and no stability in contrast to the facial axis. Key words:Long term results, stability, relapse, orthognathic surgery, class III, long face.
Highlights
An orthognathic surgery treatment represents a significant effort for both the patient and the professional and, in this sense, both aspire to see that effort rewarded with a result successful, and reasonably stable over time [1]
The changes observed between the 1st and the 3rd represent the magnitude of total changes, whether relapse has taken place or not
The decrease of the maxillary plane and the increase of the mandibular plane can be interpreted as a mandibular posterorrotation, this being logical in dolichofacial patients
Summary
An orthognathic surgery treatment represents a significant effort for both the patient and the professional and, in this sense, both aspire to see that effort rewarded with a result successful, and reasonably stable over time [1]. Chemello et al [15] did report stable results in anterorotations, concluding that the success of these cases can be achievable through correct orthodontic treatment, proper surgical technique and the presence of healthy TMJs. Despite the fact that the number of skeletal Class III patients with long-face syndrome who have undergone surgery has increased remarkably [16,17], it is surprisingly difficult to find data and reports on the long-term stability of this procedure with follow up results of more than 3 years after therapy has ended. Despite the fact that the number of skeletal Class III patients with long-face syndrome who have undergone surgery has increased remarkably [16,17], it is surprisingly difficult to find data and reports on the long-term stability of this procedure with follow up results of more than 3 years after therapy has ended This is, the reason for undertaking this study. The objectives of this study were, in the first place, to evaluate skeletal changes of the maxilla and mandible induced by surgical-orthodontic correction of malocclusions class III with long-face syndrome, and secondly, to analyze stability of these skeletal changes after a long retention period (more than 6 years)
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