Occlusion for partially denetate patients Flashcards
What does this area indicate?
premature contact
When do you hand articulate models? (unarticulated casts)
quite a good amount of teeth
When do you need to make bite blocks to record occlusion?
Kennedy 1 for example… missing lost of teeth
insufficient teeth contact
What does a facebow do?
mounting of the maxillary cast on a semi-adjustable articulator
When do you use facebow registarion?
If you want to change the whole occlusion of the pt
e.g. pt with tooth ware
e.g. multiple bridges
What can a facebow tell you with regards to RPD?
Path of insertion
What does this image show?
facebow
Facebow vs articulator?
facebow: the angle/relationship the maxilla (teeth) sit in relation to the TMJ/condyle. In the terminal hinge axis position
articulator: info from the facebow can be translated to the articulator. it imitates jaw movements - can create dentures form this
If you want to change/improve occlusion, both of these methods are key
What is the recommended occlusion for RPD?
MAINTAIN NATURAL OCCLUSION
satisfactory of unsatisfactory occlusion?
unsatisfactory
What are exceptions for RPD to not keep the natural occlusion?
- partial denture oppose a complete denture
- only anterior natural teeth remain in a kennedy class 1 type dentition
How would you carry out jaw registration and teeth setup for…
- partial denture oppose a complete denture
- only anterior natural teeth remain in a kennedy class 1 type dentition
proceed in the same manner as in the case of a complete denture
What are steps in establishing satisfactory occlusion for RPD?
- Analysis of existing occlusion
- correction of existing occlusal disharmony
- recording of ICP or RCP as appropriate
- Try in of the teeth set up and harmonising occlusion
- correction of occlusion discrepancies on the finished RPD
Would you record ICP or RCP for an RPD against a full denture?
RCP
For a RPD, when do you measure RCP instead of ICP?
Image on right, Kennedy 1 with no posterior contacts
What happens to unopposed teeth?
over eruption
How do you correct over erupted teeth due to them being unopposed?
provide patient with a crown to reduce the height of the tooth
May even have to remove teeth
What are the effects of over erupted teeth?
occlusal plane discrepancy
mandible move upwards and backwards and over close
insufficient restorative space
loss of occlusal vertical dimension (OVD)
Can you give a provisional acrylic RPD to a patient to re-establish OVD?
YES, see if they are coping well with it
What is the recommend occlusion for RPD?
occlusion for the tooth supported RPD should be arranged such that natural tooth contacts are maintained when the denture is inserted in the mouth
When do you need to record dynamic positions?
bilateral balanced occlusion in dynamic positions should be provided when a RPD oppose a complete denture
contribute to stability of complete denture
What Kennedy classifications do you record working side contacts?
mandibular kennedy 1 and 2
maxillary kennedy 2
Why must maxillary kennedy class 1 be balanced?
such an occlusal scheme will compensate for the buccal placement of the teeth on the denture, in relation to the ridge crest and offer stability
What is desirable in Kennedy class 4?
opposing anterior teeth contact in ICP is desirable to prevent over eruption of the opposing anterior natural teeth
B
What would you never sit a posterior prosthetic tooth over?
the ridge slope (retromolar pad)
If you place a 7 over the retromolar pad, what could this cause?
may cause movement of the denture anteriorly
Do you restore toothware before the construction of RPD?
Yes - needed for space for denture
