Examining Occlusion Flashcards
what is occlusal overload
obvious facets
vertical enamel fractures
abfraction
what is occlusal instability
drifting
mobility
not explained by PD disease
what to examine in static occlusion
incisor relationship
molar relationship
overjet/overbite
crossbite/openbite
individual tooth contacts
RCP-ICP slide [freedom in centric]
what to examine in dynamic occlusion
right lateral excursion
left lateral excursion
protrusion
ICP
where teeth fit together in maximum intercuspation
where teeth reach at end of chewing cycle
most stable position
ICP contacts
- functional cusps
- non functional cusps
functional -
occlude with opposing teeth
lingual UP, buccal LP
non functional -
do not occlude
buccal UP, lingual LP
ICP contacts
- fossa
depression or concavity on tooth surface
functional cusp contacts fossa of opposing tooth
lingual Umolar contacts fossa of Lmolars
buccal of Lmolar contacts fossa Umolar
overjet
upper teeth overshoot direction of lowers
open bite
anterior -
lack of vertical overlap of anterior teeth when posterior in occlusion
posterior/lateral -
failure of contact between posterior when teeth are in occlusion
mutually protected occlusion
gold standard
canine guidance
posterior disocclusion in lateral excursions
no working/non side contacts
no protrusive interferences
group function
mandible moves to left, left contacts
bilateral seen in tooth wear
anterior guidance
teeth guide mandibular movement into and away from ICP
protrusion and lateral excursion
incisal guidance
canine guidance
occlusal interference results in failure of restoration by
debonding
crown fracture
root fracture
mobility
drifting out of alignment
types of occlusal interference
working side
non working side
protrusive
why avoid posterior contacts
teeth designed to absorb heavy forces in direction of long axis
NOT significant lateral foces
less rest for muscles
occlusal trauma
undesirable tooth movements
bruxism
parafunctional grinding of teeth
involuntary rhythmic or spasm
tooth wear, fractured restorations, tooth migration, tooth mobility, muscle pain, headache, ear ache, pain, stiffness TMJ
