edentulous challenge Flashcards
pressure on mucosa causes
soreness and resorption
causes of denture movement:
resiliency of tissue
instability of the dentures
complete dentures move in relation to the underlying bone during function. more movement:
more soreness and resorption
almost all principles of complete denture fabrication have been formulated to ________ of dentures or to ________ transmitted to supporting structures
decrease movement
minimize forces
resistance to vertical movement toward the underlying tissues
support
support in natural dentition
dentin-cementum-PDL-alveolar bone
____cm2 area of pdl in each arch
45cm
mean denture-bearing areas:
maxilla=
mandible=
**decreases as ridges resorb
maxilla=23cm2
mandible= 12cm2
living bone responds to functional stress by depositing bone in areas of stress
-adaptability of natural teeth
wolff’s law
very little adaptation to functional stress on alveolar bone
endentulous patients
wearing dentures is almost always accompoanied by an undesirablel loss of bone. T or F
true
in complete denture wearers, the mean reduction in anterior mandibular ridge is ______ times that of the maxillary ridge
4 times
remove dentures at least:
8 hours per day
proper impression techniques:
- record tissues at rest
- extend denture base to use maximum support area
- placement of pressure on those tissues best able to tolerate pressure
no contact of ________ in centric relation closure for reducing pressure on residual ridges
no contact on anterior teeth
_______ and equilibriation at delivery to reduce occlusal discrepancies
clinicial remount
bone is:
not a static tissue
and
constantly being remodeled/replaced
bone of residual ridges:
max ridge
mand ridge
buccal shelf
partly covered by layer of cortical bone after teeth are extracted
maxillary ridge
crest remains spongy, trabeculated and not very resistant to resorption
mandibular ridge
(compact bone) of mandible is PRIMARY denture support area on mandibular arch!
buccal shelf
decrease the pressure per unit area by extending the denture base to COVER THE MAXIMUM AREA within physiologic tolerance (support)
snowshoe principle
more saliva contact=
more contact adhesion (retention)
proper peripheral extension=
good border seal (retention)
resistance to dislodgement/resistance to movement away from the foundation
retention
quantity and and quality affect denture retention
saliva
dryness presents much difficulty for denture wearers- discomfort, ulcerations, retention loss, chewing problems
xerostomia
attraction of unlike molecules for each other (mucosa-saliva-dent base)
adhesion
amount of ____ attributable to adhesion is directly proportional to the WETTABILITY of the denture base material, to the AREA covered by the denture base, and to the VISCOSITY of the saliva
retention
resistance to movement in the horizontal plane/ resistance to rotation/ resistance to lateral movement
stability
stability factors
shape of alveolar ridges
size of alveolar ridges/vestibular depth
flange length and shape
intimate fit of prosthesis
