Occlusion 3

Question 1

What are the different types of articulators you can get?

Answer 1

• arcon
• average value
• semi-adjustable

Question 2

What are the angles set at on an average value articulator?

Answer 2

• Bennet angle set at 15 degrees
• Condylar guidance angle set at 30 degrees

Question 3

What does the semi-adjustable articulator let you set?

Answer 3

-the bennet and condylar guidance angles

You get the full range of mandibular movements

Note: if it is not an advanced approach will use an average value

Question 4

What are the different components of a facebow?

Answer 4

• reference plane locator
• bite fork
• earbow
• transfer jig assembly

Question 5

What does the facebow measure and why is this important?

Answer 5

It measures the distance from the anterior maxillary teeth to the condyles

This is important for mounting the casts accurately on the articulator. By doing this you will get the same arc of closure on the articulator as you would in the patients mouth (the cast will be hanging from the articulator as it would hang in the patients mouth).

Question 6

What point is marked on the patient when using a facebow?

Answer 6

The anterior reference point

Question 7

Where is the anterior reference point marked and what is it the approx position of?

Answer 7

Marked on patients RHS (nose) using the reference plane lacator and marker

It is 43mm apical to the incisal edge of the anterior tooth (normally the 12)

It is the approx position of the infraorbital foramen

Question 8

NOTE: there are more slides explaing the procedure of recording the relationship of the maxilla to the hinge axis using a facebow and videos

Question 9

What are the 2 choices of interocclusal relationships you can use to mount the lower cast once you have mounted the upper cast?

Answer 9

• ICP (conformative approach)
• RCP (reorganised approach)

Question 10

What are the different things you can use/ways you can to mount the casts using ICP?

Answer 10

• wax
• paste
• no material
• record block

Question 11

When would you use no material to mount the casts in ICP?

Answer 11

• When the intercuspal relationship is obvious
• there are multiple tooth contacts when the patient bites together

Question 12

When would you use wax to aid mounting in ICP and how should you use the wax/what should you be careful of?

Answer 12

Use it when ICP is not obious

Must ensure the wax is thin and the cusp tips are visible. If you use too much wax then the OVD will be increased and the restoration will be placed high in the bite

Question 13

When would you use registration paste for mounting in ICP?

Answer 13

When the ICP won’t be obvious to the technician

NOTE: it is a silicone paste that sets quickly. Small amount needed and if too thick will increase OVD. Occlusal contacts mut be visible through the material

Question 14

What is the conformative approach defined as?

Answer 14

-the provision of restorations in harmony with the existing jaw relationships

This means that the occlusion of the new restoration is provided in such a way that the occlusal contacts of the other teeth remain unaltered

Question 15

When might we not use the conformative approach?

Answer 15

• an increase in vertical height is needed to make space for restorations (can’t conform)
• Tooth/teeth significant out of position (i.e overerupted, tolder or rotated)
• A significant change in appearance is wanted (might have marked toothwear)
• There is a history of occlusally related failure or fracture of existing restorations

Question 16

What are the most reliable techniques to help record the retruded contact position?

Answer 16

• bimanual manipulation
• chin point guidance
• chin point guidance with anterior jig

Question 17

Why is the retruded arc of closure important?

Answer 17

Because it is used in a reoorganised apprach when restorting the dentition

The RCP can be placed at any point on this arc of closure (found between R and RCP)