Fixed Prosthodontics Flashcards
Why may a face bow record be required?
To allow casts to be mounted on a semi or fully adjustable articulator
Why is a semi-adjustable articulator required for face-bow recording? Give two main reasons.
- To allow the relationship of the casts to be visualised in a number of functional positions during the planning stage of treatment.
- To allow the relationship to be reorganised by the waxing up or fabrication of restorations.
Define a confirmative relationship.
Same occlusion before and after placement of a restoration.
What does a face bow record?
The relationship of the maxillary teeth to the condylar head in a retruded position (i.e. a posterior superior position)
Why are there indentations on the bite fork component of a face bow recording?
This is for mechanical retention of the wax onto the bite-fork
What are the 4 types of articulators?
- Simple hinge (e.g. plane line)
- Average value (e.g. free plane)
- Semi-adjustable (e.g. denar or dentatus)
- Fully adjustable
What articulator is described:
1. equivalent to holding casts in your hand
2. Occlusal relationship only correct when casts are together
Simple hinge articulator
What articulator is described:
1. Sufficiently accurate for reproducing ICP
2. Suitable for posterior restorations where there is guidance from other teeth
3. Suitable for a complete removable prosthesis
Average value articulator
What articulator is described:
1. Mandibular condyle (arcon)
2. Used for fixed pros
3. Multiple units
4. Reorganised occlusion
Denar semi-adjustable articulator
What articulator is described?:
1. Maxillary condyle (non arcon)
2. Used for rem pros
3. Multiple units
4. Re-organised occlusion
Dentatus semi-adjustable articulator
Define the terminal hinge axis.
An axis through both condyles when they are in most retruded unstrained position in the glenoid fossa. The terminal hinge axis coincides with the position of central relation.
As part of a facebow recording, what does the bite-fork record?
The position of the teeth
As part of a facebow recording, what does the bow record?
The position of the condyle
What 4 factors MUST be determined prior to preparing teeth for laboratory fabricated restorations?
- Pain from TMD
- Unexplained facial pain
- Chronic dental pain
- Discomfort from mobile teeth
What 3 ways can the “comfortable closed position where the maximum number of natural teeth meet.” Be addressed?
- ICP
- Centric occlusion (CO)
- Maximum intercuspation