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Publication:
International Journal of Adult Orthodontics and Orthognathic Surgery

Year 1987
Volume 2 , Issue 4

Back
Pages: 221 - 231

Soft tissue response for Le Fort I maxillary impaction surgery

Sakima/Sachdeva

Pre- and postoperative lateral cephalograms of 20 subjects with maxillary vertical excess were studied to evaluate the effects of the maxillary Le Fort I impaction procedure on soft tissue. Cranial base and separate maxillary and mandibular superimpositions were used to assess the soft tissue changes. Included in the data studied were linear measurements to describe the displacement of selected soft tissue landmarks, area changes, and the shift in the location of the centroid of the upper and lower lip and soft tissue of the chin. Prediction schemes for the soft tissue response were developed using simple ratios and multiple regression equations. It was found that the lower border of the upper lip followed approximately 40% of vertical change in the maxilla. The lower lip and chin responded to mandibular movement in a ratio of approximately 1:1 in the vertical plane of space. Minimal area changes were seen in the upper lip, lower lip, and chin. Soft tissue redistribution in the upper lip appeared to occur in an inferior direction. Prediction schemes developed using the multiple regression equations did not seem to offer greater accuracy than those derived from mean ratios.

 

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