Abstract
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 E dlan & M ejchar 2 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.
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