BDS3 Flashcards
what does edentulism do to soft tissues
ridge resorption
reduce face height
soft tissue changes to lip and chin
what are the main reasons for complete dentures
caries
periodontal disease
tooth wear
failing dentitions
occlusal collapse
appearance
what is support
resistance of vertical movement of a denture towards the ridge
what gives support on the upper arch
palate and ridge crest
what gives support on the lower arch
buccal shelf, pear shaped pad, ridge crest, genial tubercles
what is retention
resistance to displacement of a denture away from the ridge
what is stability
ability of a denture to resist displacement by functional stress
what is adaptation in relation to dentures
degree of fit between prosthesis and supporting structures
what impression material do you use for people who gag and why
red compound as it sets faster
what do you look for when assessing if an impression is adequate
are all edentulous areas included
are sulci recorded fully
are deficiencies present
what do special trays allow
accurate peripheral extension
uniform thickness of material
reduced amount of material
records denture area more accurately
what do you aim for with impression taking
well rounded borders
minimal air blows
impression centrally placed
all clinically relevant areas
what is the process of replica dentures
lab putting impression on working side
impression of fit surface
record blocks to record occlusion
impression of fit surface with light body silicone with denture in mouth
shade and mould
try in wax
what is mucocompression
pressure applied so tissues recorded under load
what is mucostasis
minimum pressure so records at rest
what is the steps of jaw registration
upper block for retention
upper block for tooth position
upper block for occlusal planes
lower tooth position and horizontal jaw relationship
OVD and RVD
record registration
shade and mould
what does LIMBO stand for
lip support
incisal level
midline
buccal corridor
occlusal plane
what is the angle for lip support
90 degrees
how much tooth should show with complete dentures
1-2mm
what are the reference lines for the occlusal plane
interpupillary
ala-tragus
what is the neutral zone
space between the lips and cheeks and tongue where forces are equal
what is the freeway space meant to be
2-4mm
what do you measure FWS with
willis bite gauge
what gives retention
adhesion
base shape and adaptation to mucosa
post dam seal
retromylohyoid fossa
labial undercut