Appearance and Functional Harmony of Denture Bases
Three principal factors are conserned in the functional harmony of denture bases
Basal or impression surface
Occlusal surface of the teeth
The shape and the form of the polished surfaces of the dentures
The shape of the polished surfaces
The forced exerted in the direction of the occlusal plane by the tongue and cheek can act as either a placing or displacing agent, depending on the shape of the polished surfaces
Determining inclination of the polished surfaces
The widht of the border
The buccolingual position of the teeth
The power of inclined plane forces on the shape given the polished surfaces as a mechanical aid or detriment in retention
When the lingual and buccal borders of a mandibular denture are being shaped, they can be made concave so that, the tongue and the cheek will grip and tend to seat the denture.
Shaping the surface of the denture base in such a manner that the muscle action of the cheeks would tend to seat the mandibular denture
The buccal surface of the mandibular dentures in the first premolar region should be shaped carefully so as not to interfere with the action of the modiolus connecting the facial muscles with the orbicularis oris muscle
If the polished surface incline is toward the cheek or if the arch in the premolar region is too wide, this connecting point of muscles will displace the mandibular denture
