Chpt 1: edentulous state Flashcards
what are the ends of the PDL called
sharpey’s fibers
support mechanism for vertical forces in teeth vs dentures
teeth = pdl dentures = oral mucosa
oral mucosa is unsuitable for
load-bearing function under dentures bc there is no attachment and not enough SA
support system of natural dentition
- fully stable
- PDL SA: 90cm2
- sensory system: proprioception
- high viscoelasticity of PDL
- adapt teeth to forces
support system of complete dentures
- unstable
- denture-bearing area: 35 cm2
- no sensory system
- compression of mucosa
- lack of adaptation of dentures
why cant people with dentures adjust forces for different food
they have the same range of chewing forces and they have no proprioception
edentulism and poor health conditions often co-exist, causing the oral mucosa to be fragile, resulting in
denture stomatitis and candidiasis
stages of healing of extraction socket
- blood clot
- granulation
- fibroplasia
- connective tissue
- coarse bone
- mature bone
which part of the jaw bone resorbs and which doesnt
- alveolar process resorbs overtime
- basal bone rarely resorbs
5 favourable qualities for a residual ridge
- thick cortical bone
- dense cancellous bone
- broad rounded crest
- high vertical slopes
- firm, dense CT
how does the maxillary alveolar process resorb
- “centripetal resorption”
- more medially positioned alveolar crest
- up and in
how does the mandibular alveolar process resorb
- “centrifugal resorption”
- more laterally positioned alveolar crest
- down and out
what causes bone resorption
lack of transfer of tensile and shear forces to alveolar bone by “loss of PDL”
what results as a combination of max and mand resorption
prognathism
when is the highest rate of bone resorption
1st year after extraction
max: 2-3 mm
mand: 4-5 mm
