Occlusion and Restorative Dentistry 3 Flashcards
What are the values of an Average Value articulator?
Bennet Angle set at 15º
Condylar Guidance Angle set at 30º
How does a semi-adjustable articulator differ from an average value one?
You can set the Bennet and Condylar Guidance Angles
What is a facebow used for?
To record the relationship of the upper arch to the mandibular condyles
What are the components of a facebow?
Reference plane locator
Bite fork
Transfer jig assembly
Earbow
How should the anterior reference point for a facebow be marked what point is marked?
Mark it using the reference plane locator and a marker
43mm apical to the incisal edge of the anterior teeth - lateral incisor ideally
This is the approximate position of the infraorbital foramen
How is a bite registration taken when using a facebow?
Apply bite reg paste to the bite fork, with the locating notch facing up
Seat to record cusp tips of maxillary teeth
How is an earbow and transfer jig assembled?
Numbers 1 and 2 face towards you
Loosen centre wheel to allow earbow to open and close
Attach vertical shaft to the measuring bow with clamp marked 2 on the patients right and tighten the finger screw on the earbow
How is a lower cast mounted?
By taking an Inter occlusal registration
What Inter occlusal registrations can be taken when mounting a lower cast?
Intercuspal position - con formative approach
Retruded contact position - reorganised approach
What materials may be needed for an ICP registration and why may they be needed?
If ICP is obvious then no material is needed
If ICP is not obvious to technician then wax or paste can be used
If free end saddles and cast cannot be hand articulated then record blocks should be made
How should wax and paste be used for an Inter occlusal record?
Ensure wax or paste is thin and cusp tips are visible
Too thick and it will increase the OVD
What is a conformative approach?
The provision of restorations in harmony with the existing jaw relationship
When is a reorganised approach used?
If an increase in vertical height is needed to make space for restorations
Tooth/teeth significantly out of position (tilted, overerupted)
A significant change in appearance is wanted
There is a history of occlusally related failure or fracture of existing restorations
In a reorganised approach, when is the occlusion defined?
Before any restorative work is carried out
What techniques can be used to get an Inter occlusal record in RCP?
Bimanual manipulation
Chin point guidance
Chin point guidance with anterior jig
