Retention and Stability of Complete Dentures Flashcards
what is retention
resistance of a denture to vertical movement away from the tissues
what is stability
the resistance of a denture to displacement in a horizontal direction
what are the displacing forces
gravity
muscle activity
sticky foods
function
what is adhesion
physical attraction of unlike molecules for each other
what are the 2 types of adhesion
saliva and mucous membrane
saliva and denture base
what is cohesion
physical attraction between similar molecules
what is the type of cohesion
salivary film
how do you achieve optimum retention and stability with complete dentures
fitting surfaces
polished surfaces
occlusal surfaces
what are the 2 parts of the fitting surface
base shape
adaptation to mucosa
what jaw has greater base extension
maxilla
what also helps to create retention in the maxilla
post dam seal for denture
full coverage of denture bearing area
what should help with retention on the lower denture
adequate extension into the retromylohyoid fossa (lingual pouch)
how can you ensure that a denture has good adaptation to mucosa
impressions with good surface detail
what are the undercuts in the mouth we can use for retention
labial undercut
bilateral soft tissue undercuts
bilateral boney undercuts
what can make retention and stability difficulty
atrophic ridges
patients with incomplete palate
fibrous/flabby ridge
damage alveolar ridge
mobile soft tissue
gagging patients
CoCr base plate
insufficient saliva
