Recording Occlusion Flashcards
what is an articulator
device which casts are attached to allow simulation of jaw position and movement
uses of articulators
occlusal examination
plan tx through occlusal adjustment and diagnostic waxing
help make restorations that will require minimal adjustment in mouth
types of articulators
simple hinge
arcon
average angle
semi adjustable
fully adjustable
facebow transfer
spatial relationship of maxilla to hinge axis of rotation of the mandible
bite fork, transfer jig assembly and ear bow
ear bow = hinge axis in condyles
how to mount lower cast
interocclusal registration
ICP - best
RCP
how to record ICP
no material - ICP obvious, multiple tooth contacts
wax -
registration paste -
ICP registration WITHOUT OVD increase is called….
conformative approach
simple
ICP registration WITH OVD increase is called…….
reorganised approach
not simple
RCP registration WITH/WITHOUT OVD increase is called…..
reorganised approach
not simple
when not to use a conformative approach
- increase in vertical height needed
- teeth significantly out of position [overerupted, tilted, rotated]
- significant change in appearance wanted
- history of occlusally related failure or fracture of existing restorations
how to reorganise occlusion
- examine existing occlusion
- plan and design new occlusion
- pre-definitive restoration tx
- provision of definitive restorations
NEED
reproducible jaw position
appropriate vertical dimension
appropriate occlusal scheme
why would you use the RCP instead of ICP
ICP non existant or no use
need space to place restorations
reproducible position of mandible independent of teeth
what points on posselts envelope is the retruded arc of closure
(CR)
between R and RCP
retruded axis and retruded contact position
techniques to examine RCP
chin point guidance
bimanual manipulation
chin point guidance with anterior jig
taken at slight increased OVD
