7 - Occlusion 3 Flashcards
What is an arcon articulator?
Condyle is set on the lower component
What is an average value articulator?
- Bennet angle is set at 15 degrees
- condylar guidance angle is set at 30 degrees
What is a semi-adjustable articulator?
Allows operator to set their own Bennet and condylar guidance angles
What are the different components of a facebow?
- bite fork
- transfer jig assembly
- earbow
- reference plane locator
What are the steps of taking a facebow registration?
- mark anterior reference point
- bite registration using bite fork
- assembly of earbow and transfer jig
- fit bow’s earpieces into patient’s ears
- align pointer with anterior reference point
- ensure bow is parallel to floor
What is the anterior reference point?
- 43mm apical to the incisal edge of 12
- approx location of infraorbital foramen
What does a facebow record?
The relationship of the maxilla to the hinge axis of rotation of the mandible
How can you mount the lower cast?
- ICP (conformative approach)
- RCP (reorganised approach)
How do you record the ICP when ICP is not obvious to technician?
- wax
- paste
How do you record the ICP when ICP is obvious to technician?
- lots of tooth contacts
- no material required
How do you record the ICP when there are free end saddles?
Record block
What are considerations when taking an occlusal record in wax or paste?
- if the material is too thick it will prop the occlusion open and this becomes a reorganised approach
- ensure cusp tips are visible through material
Define a conformative approach.
- provisions of restorations in harmony with the existing jaw relationship
- restorations do not alter the occlusion of other teeth
When is the conformative approach not utilised?
- when increased OVD is required
- teeth are out of position
- significant change in appearance
- history of occlusally related failures
What is a reorganised approach?
- new restorations are planned to a different occlusion that is defined before work begins
- should be well tolerated by patient
