88 - . Methods of retention and stabilization of complete dentures

what is denture stability

the resistance of a denture to movement on its tissue foundation, especially to lateral (horizontal) forces as opposed to vertical displacement (termed denture retention)

what is denture base adaption

Maximum coverage without undue displacement of the tissues. development of a good border seal close adaptation of denture base

stability is affected by

residual ridge size and contour • residual ridge quality

whats palatal vault

steep or high arched palate enhances the stability; square arches tend to resist rotation of the prosthesis better than the other arch forms.

whats neutral zone

potential space between the lips and cheeks on one side and the tongue on the other; that area or position where the forces between the tongue and cheeks or lips are equal.

how to check stability of denture

• pressure is applied with the ball of a finger to the premolar and molar region of each side alternatively. pressure must be at right angle to occlusal surface.

• if pressure on one side causes the denture to tilt and raise on the other side it indicates that teeth on the other side to which the pressure is applied are outside the ridge.

how to maximise stability of dentures

• understanding muscle actions.

• maximum coverage of denture bearing area within physiological limits

whats denture retention

the resistance in the movement of a denture away from its tissue foundation especially in a vertical direction

factors affection degree of retention

• anatomical

  • size and quality of denture bearing area

• physiological

  • saliva

• physical

  • adhesion

  • cohesion

  • gravity

  • atmospheric pressure

• mechanical

  • undercuts

  • retentive springs

  • magnetic forces

• muscular

  • oral and facial musculature

types of retentions

• primary

  • physical and mechanical means

• secondary

  • surrounding musculature

  • shape of denture border and flanges

  • psychological factors

dislodinging factors

• mastication

• adhesive food

• gravity

• surrounding musuclature

• occlusal prematurity

• parafunctional habits