LIP FULLNESS Apparent fullness of the lip is directly related to the support provided by the teeth and alveolar bone or denture base Lip fullness should not be confused with lip thickness, which involves the intrinsic structure of the lip.
INADEQUATE LIP SUPPORT If anterior maxillary denture teeth are set excessively palatally to reduce the overjet can lead to a lack of lip support Producing vertical wrinkles in the face Results in the teeth appearing to be “too short”—a problem usually best corrected not by lowering the occlusal plane but by increasing lip support
Insufficient support of lips is characterized by a reduction in the visible part of the vermillion border A drooping and deepening of the nasolabial grooves Small vertical lines or wrinkles above the vermillion border A reduction in the prominence of the philtrum A drooping or turning down of the corners of the mouth A deepening of the sulci 4
EXCESSIVE LIP SUPPORT Prominence of the residual alveolar ridge or excessive thickness of labial flange can result in excessive lip support Make the lip appear to be too full rather than displaced Also can make the lip appear thick or short An obliterated philtrum or mentolabial fold suggests excessive support
CORRECTION OF LIP SUPPORT Problem with lip fullness is in the patient’s reaction to changes If the existing dentures have the teeth set too far palatally, the patient may feel that the new and corrected tooth arrangement makes the lip too full Extra time will be needed at the try-in of the wax dentures to ensure that the patient is comfortable with the agreed design
7 Lip Mobility Class 1- Normal Class 2- Reduced Class 3- paralysis Patients with minimal lip mobility show very little of the anterior teeth. Some stroke victims may have paralysis of half the lip, leading to unilateral mouth droop and facial asymmetry. Engelmeier RL, Phoenix RD. Patient evaluation and treatment planning for complete denture therapy. Dent Clin North Americ 1996; 40(1): 1-18.