The sublingual crescent extension and its relation to the stability and retention of mandibular complete dentures.

The extension of the flange in the sublingual crescent region is an important factor for mandibular denture stability and retention. Making the impression with minimal pressure on the floor of the mouth while the tongue is at rest allows greater mobility of the underlying muscles without denture dislodgment and without occlusion of the sublingual gland ducts. The anatomy of the sublingual crescent region and the clinical procedure for recording the anterior lingual seal region are described. Upon completion of the impression, resistance to dislodgment is usually achieved.