Perio Flashcards
(119 cards)
function of the periodontium
- to attach the teeth to the jaws
- dissipate occlusal forces
types of horizontal forces
- constant - orthodontic
- intermittent - occlusal (jiggling)
excessive occlusal force definition
- occlusal force that exceeds the reparative capacity of periodontal attachment aparatus
- results in occlusal trauma and/or excessive tooth wear
occlusal trauma definition
- injury which results in changes within periodontal attachment aparatus
- as a result of occlusal force(s)
- may occur in a intact periodontium or in a reduced periodontium caused by periodontal disease
what is periodontal attachment aparatus
- periodontal ligament
- supporting alveolar bone
- cementum
factors influencing tooth mobility
- width of PDL
- height of PDL
- inflammation
- number, shape and length of roots
tooth mobility indicates
- successful adaptation of periodontium to functional demands
- reflects the nature of the remaining attachment
- does not necessarily represent a pathological state of affairs
tooth mobility can be accepted unless
- it is progressively increasing
- it gives rise to symptoms
- it creates difficulty with restorative tx
therapy to reduce tooth mobility (tx options)
- control of plaque-induced inflammation
- correction of occlusal relations
- splinting
response of the healthy periodontium to primary occlusal trauma
- PDL width increases until forces dissapated
- tooth mobility increased
- this is successful adaptation to increased demand
- if demand is subsequently reduced the PDL width should return to normal
- if demand too great or PDL adaptibility reduces PDL width may continue to increase
histological changes occuring during occlusal trauma to healthy periodontium
- on pressure side: increased vascularisation and permeability, necrosis of PDL, thrombosis, hameorrhage, bone resorption
- on tension side: elongation of PDL, apposition of alveolar bone and cementum
- density of alveolar bone decreases while width of PDL space increases
secondary occlusal trauma
- injury which results in tissue changes
- from normal or excessive occlusal forces applied to tooth/teeth with reduced periodontal support
- occurs in presence of attachment loss, bone loss, and normal/excessive occlusal forces
evidence of occlusal trauma
- tooth mobility which is progessively increasing
- tooth moblility associated with symptoms
- radiographic evidence of increased PDL width
define fremitus
palpable or visible movement of a tooth when subjected to occlusal forces
occlusal trauma
diagnosis made from
- progressive tooth mobility
- fremitus
- occlusal discrepancies
- wear facets
- tooth migration
- also…
- tooth fracture
- thermal sensitivity
- root resorption
- cemental tear
- widening of PDL space on radiograph
tooth migration causes/results in
- loss of periodontal attachment
- unfavourable occlusal forces
- unfavourable soft tissue profile
management of tooth migration
- treat the periodontitis
- correct oclusal relations
- either accept the position of the teeth and stabilise or move the teeth orthodontically and stabilise
splinting for perio may be appropriate when
- mobility is due to advanced loss of attachment
- mobility is causing discomfort or difficulty in chewing
- teeth need to be stabilised for debridement
negatives of splinting for perio
- does not influence the rate of periodontal destruction
- may create hygiene difficulties
- is a treatment of last resort
effect of excessive occlusal forces on gingival recession
no correlation identified
2017 perio disease classification
10 listed classifications
- health
- plaque induced gingivitis
- non plaque induced gingival disease and conditions
- periodontitis
- necrotising periodontal disease
- periodontitis as a manifestation of systemic disease
- systemic diseases or conditions affecting the periodontal tissues
- periodontal abscess
- periodontal-endodontic lesions
- mucogingival deformities and conditions
2017 perio disease classification
gingival health
- intact periodontium - absence of bleeding on probing, erythema and edema, pt symptoms and attachment and bone loss
- reduced periodontium due to causes other than periodontitis
- <10% bleeding sites and probing depths <= 3mm
- physiological bone levels range from 1-3mm apical to CEJ
2017 perio disease classification
plaque induced gingivitis
- BPE score 1 or 2
- associated with biofilm alone
- mediated by systemic or local risk factors - drug influenced gingival enlargement etc
- no radiological bone loss
- no interdental recession
- bleeding on probing <30% localised and >30% generalised
plaque induced gingivitis modifying factors
- can exacerbate but not cause gingivitis
- drug induced gingival enlargement - amlodipine (ca channel blocker), anticonvulsants, immunosuppresants
- sex steroid hormones - puberty, pregnancy, oral contraception
- hyperglycemia
- smoking
- malnutrition
- prominent subgingival restoration margins
- hyposalivation