Profile changes of bone and soft tissues following vestibular sulcus extension by the operation of Edlan and Mejchar. A 2-year follow-up study-II.

The progression of alveolar resorption and the alteration of the soft tissue profile of the chin were studied in 15 patients operated on by the vestibular sulcus extension technique of EDLAN & MEJCHAR. Lateral cephalograms and tracings exhibited an apparently accelerated bone resorption of the alveolar crest. Furthermore, a significant reduction of lower lip height and increase of mental soft tissue protrusion have been recorded.