Vestibuloplasty all are true except:

Vestibuloplasty The reduction of alveolar ridge size is frequently accompanied by an apparent encroachment of muscle attachments on the crest of the ridge. These so-called high (mandibular) or low (maxillary) attachments serve to reduce the available denture-bearing area and to undermine denture stability.  Key concept: Vestibuloplasty is a soft tissue procedure, and does not necessitate bone grafts. TYPES OF VESTIBULOPLASTY:- Mucosal advancement (Submucous) V’plasty: The mucous membrane of the vestibule is undermined and advanced to line both sides of the extended vestibule. Secondary epithelization vestibuloplasty: The mucosa of the vestibule is used to line one side of the extended vestibule, and the other side heals by growing a new epithelial surface. Grafting vestibuloplasty: Skin, mucous membrane and dermis can be used as a free graft to line one or both sides of the extended vestibule.