Selecting equipment Flashcards
What is the main function of articulators? (1)
To hold models in ICP
Limit of simple hinge articulators (2)
Only hold models in ICP
Do not mimic opening movening as hinge is in wrong place
Anatomical articulator required to (1)
Replicate jaw movements
Example of an anatomical articulator (1)
Galetti
Two relationships important to position models on an articulator (2)
Average relationship
Bonwill Triangle
What does a facebow do? (1)
Records relationship between condyles and maxillary teeth
What is an Earbow articulator? (2)
Facebow wherein external auditory canal used for convenience
Earbow arm compensates
Average value anatomical articulators use which values? (2)
30 degree condylar angle
Straight condylar pathway
Semi adjustable articulators use which values? (2)
Condylar path can be adjusted between 0 and 60 degrees
Condylar path is still flat
Intercondylar width and Bennet movement may also be adjusted on some models
Fully adjustable articulators use which values? (3)
Custom made condylar pathways
Mechanically replicate the movements of the condyles
Use a pantograph or sterograph to record condylar movements
Denar Automark or Combi use which values? (1)
Fixed 20 degrees condylar angle
Selecting equipment depends on (3)
Occlusal scheme
Objectives of treatment
Clinician’s skill
Ideal occlusion for complete dentures (5)
Balanced Occlusion RCP – ICP Working side contacts Balancing (Non-working) side contacts Protrusive contacts on incisors and posterior teeth
Instruments used for complete dentures (in theory) (3)
Facebow transfer (because models will be moving) Models mounted in CR Reproduction of condylar movement -condylar angle -intercondylar width -Bennett movement
Anterior guided dentition - discluding teeth (3)
Contact in ICP
Disclusion elsewhere
We are relying on anterior guidance rather than the condyle to create disclusion here
Instruments for anterior guided dentition (discluding) (4)
Facebow transfer
Models mounted in ICP (conforming)
20 degree condylar angle
Use average Bennett movement and intercondylar width
Guiding teeth in anterior guiding dentition (3)
Care and attention required, either:
- check carefully in the mouth
- copy existing guidance on to articulator
- change guidance
Instruments for guiding teeth in anterior guiding dentition (5)
Facebow transfer Mount models in ICP 20 degree condylar angle Use average Bennett movement and intercondylar width Record anterior guidance
Instruments for reorganising the occlusion (4)
Facebow transfer
Mount models in CR
20 degree condylar angle
Use average Bennett movement and intercondylar width
Which dentitions require more attention? (2)
When posterior teeth contact in:
- protrusive excursions
- non-working side excursions
