Edentulous Challenge Flashcards
complete endentulism and comorbidities
can effect the whole body
artificial teeth rest on
mucous membranes
pressure on mucosa causes (2)
soreness
resorption
complete dentures move in relation to the
underlying bone during function
more movement=
more soreness and resorption
causes of denture movement (2)
resiliency of tissue
instability of the dentures
almost all the principles of complete denture fabrication have been formulated to (2)
decrease movement of the dentures or to minimize the forces transmitted to the supporting structures
problem: in the edentulous state, there are
few natural adaptive mechanisms left. the dentures rest of tissues that will change progressively and irreversibly
support
resistance to vertical movement toward the underlying tissues
support in the natural dentition (4)
dentin
cementum
PDL
alveolar bone
— cm2 area of PDL in each arch
45
mean denture bearing areas
maxilla: 23 cm2
mandible: 12 cm2
mean denture bearing areas decrease as
ridges resorb
wolffs law
living bone responds to functional stress by depositing bone in areas of stress
remarkable adaptability of natural teeth/masticatory system
edentulous patients
very little adaptation to functional stress on alveolar bone
wearing of dentures is almost always accompanied by
an undesirable loss of bone
in complete denture wearers the mean reduction in anterior mandibular ridge is -x that of the maxillary ridge
4x
reducing pressure on residual ridges (4)
remove dentures at least 8 hr/day
proper impression techniques
no contact of anterior teeth in centric relation closure
clinical remount and equilibration at delivery to reduce occlusal discrepancies
proper impression techniques (3)
record tissues at rest
extend denture base to use maximum support area
placement of pressure on those tissues best able to tolerate pressure
bone is not a static
tissue
bone is constantly being
remodeled/ replaced
maxillary ridge
partly covered by a layer of cortical bone after teeth are extracted
mandibular ridge
crest remains spongy, trabeculated and not very resistant to resorption
— — of mandible is primary denture support area on mandibular arch
buccal shelf (compact bone)
snowshoe principle
decrease the pressure per unit area by extending the denture base to cover the maximum area within physiologic tolerance (support)
more saliva contact=
more contact adhesion (retention)
proper peripheral extension=
good border seal (retention)
retention
resistance to dislodgment/resistance to movement away from the foundation
saliva (2) affect denture retention
quantity
quality
xerostomia
dryness presents much difficulty for denture wearers- discomfort, ulcerations, retention loss, chewing problems
amount of retention attributable to adhesion is directly proportional to the
wettability of the denture base material, to the area covered by the denture base, and the viscosity of the saliva
stability
resistance to movement in the horizontal plane/resistance to rotation/resistance to lateral movement
stability factors (4)
shape of alveolar ridges
size of alveolar ridges/vestibular depth
flange length and shape
intimate fit of prothesis
flange
length of base that fits the mouth, edge of the denture
complete dentures are often regarded as substitute treatment for
expensive restorative therapy, periodontal therapy, or for an unaesthetic dentition
denturism
dentures made by someone other than a dentist
complete denture steps include (3)
diagnosis
treatment planning
denture fabrication
do dentures cure edentulism?
no
dentures are not substitutes for natural teeth, dentures are
substitutes for no teeth
