Abstract
BackgroundPrediction of the treatment outcome of various orthodontic procedures is an essential part of treatment planning. Using skeletal anchorage for intrusion of posterior teeth is a relatively novel procedure for the treatment of anterior open bite in long-faced subjects.MethodsData were analyzed from lateral cephalometric radiographs of a cohort of 28 open bite adult subjects treated with intrusion of the maxillary posterior segment with zygomatic miniplate anchorage. Mean ratios and regression equations were calculated for selected variables before and after intrusion.ResultsRelative to molar intrusion, there was approximately 100% vertical change of the hard and soft tissue mention and 80% horizontal change of the hard and soft tissue pogonion. The overbite deepened two folds with 60% increase in overjet. The lower lip moved forward about 80% of the molar intrusion. Hard tissue pogonion and mention showed the strongest correlations with molar intrusion. There was a general agreement between regression equations and mean ratios at 3 mm molar intrusion.ConclusionsThis study attempted to provide the clinician with a tool to predict the changes in key treatment variables following skeletally anchored maxillary molar intrusion and autorotation of the mandible.
Highlights
Prediction of the treatment outcome of various orthodontic procedures is an essential part of treatment planning
We have previously reported on the skeletal, dental, and soft tissue effects following maxillary posterior intrusion using zygomatic miniplates [35,36,37]
The objective of this paper is to present regression models that help provide more accurate prediction of the effect of molar intrusion on several skeletal, dental, and soft tissue parameters important for the clinician
Summary
Prediction of the treatment outcome of various orthodontic procedures is an essential part of treatment planning. Using skeletal anchorage for intrusion of posterior teeth is a relatively novel procedure for the treatment of anterior open bite in long-faced subjects. Prediction of the change in the orofacial complex has been given a lot of attention in the orthodontic literature. Orthodontists have been interested in predicting the changes due to growth [2, 3]. A lot of emphasis has been given to the prediction of changes in the soft tissues of the face which brought about orthognathic surgery [4, 5]. Prediction of the soft tissues following orthodontic tooth movement was reported in lip response to premolar extraction and anterior retraction [6].
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