Intro to occlusion Flashcards
what is occlusion
how the teeth come together and function
if the patients bite does not feel comfortable what can this lead to
pain
fracture of restorations
loosening of teeth
what can go wrong with occlusion
overloading of force on the teeth
what are the causes of overloading on teeth
can be due to a premature contact( interference) “feels high”
lateral excursions on post teeth
excessive forces due to parafunction(bruxism)
what is fremitus
the feeling of the tooth vibrating when you touch it
what does a lot of fremitus lead to
inflammation and bruising of the PDL which can lead to bleeding
widening of the PDL
what can we see on a amalgam filling if the restoration is a bit high
the restoration will become slightly shiny
how do we avoid occlusal problems with restorations
by having the restorations conform to the patients existing occlusion
what should we do before even starting a filling
use articulating paper to see where the load lies and get the patient to tap tap tap and move side to side
what are posterior teeth designed for
vertical forces
what issues can occur with bruxism
increased wear
fracture of restorations
muscle pain
microcracks
what is free way space
space between the teeth at rest usually 2mm-4mm
what is the freeway space usually
2mm-4mm
what do we call the occlusion when we bite together
the ICP- inter cusp position
what is the ICP
INTER CUSPAL POSITION- the maximal digitation of the teeth
what is the ICP driven by
not by bones driven by the position of the teeth
what is closing in retruded driven by
the position of the bones- to get the condyle fully seeded in the glenoid fossa
what is the RCP
retruded contact point- the first tooth that touches if we were in a skeletal position
what is the distance of opening on rotation
20mm
what axis do we rotate around when opening the jaw
the terminal hinge axis
what is translation of the jaw hinge
the jaw slides forward as it continues to open
allows us to eat nuts etc
what muscle is used in translation
lateral pterygoid muscle- pulls the condylar process forwards
what key muscles are used when closing the jaw
temporalis
masseter
medial pytergoid
what is protrusion
from the ICP TO sliding the jaw forward
what helps protect the posterior teeth
condylar guidance-
what is condylar guidance
as we protrude the jaw drops down and the lower teeth gets pushed away from the upper teeth
what happens if we have a shallow condylar guidance
causes more damage to the posterior teeth as they juddering against each other
what are lateral movements
forward backward movement
what is the definition of occlusal scheme
either in canine guidance or group function
canine guidance
The canines on the working side are the only teeth to remain in contact when moving to that side
what is group function
On lateral movements 2 or more teeth remain in contact on the working side
what is an articulator
Mechanical device that recreates the patients jaws upon which study models can be positioned and the relationship between upper and lower teeth studied
