Soft-tissue changes associated with surgical total maxillary intrusion.

A retrospective investigation was undertaken to evaluate the soft-tissue profile response to total surgical maxillary intrusion performed to reduce vertical maxillary excess. Lateral head films of ten adult patients taken preoperatively and at least 6 months postoperatively were compared to evaluate soft- and hard-tissue change. Statistical analysis of soft-tissue behavior of the nose, upper lip, lower lip, and chin, using simple and multiple correlations and regression functions, was performed. Prediction data for soft-tissue response to hard-tissue movement were developed using simple and multiple regression equations. The results of the study indicated that soft-tissue profile changes associated with total surgical maxillary intrusion are predictable. The change in the soft tissue in relation to total surgical maxillary intrusion was summarized and prediction tables based on the most significant simple and multiple regression equations were presented for clinical trial.