Occlusion and restorations

Question 1

What is the working side in excursions?

Answer 1

Side the teeth move to

Question 2

Describe mutually protective

Answer 2

In ICP, molars take most of the load

In excursion = anterior/canine guidance

Question 3

What are functional cusps?

Answer 3

Cusps that occlude with opposing teeth in centric occlusion

Question 4

What are guiding cusps?

Answer 4

Cusps that do not occlude with opposing teeth in centric occlusion

Question 5

Function of guiding cusps?

Answer 5

Contain the food

Question 6

Function of marginal ridge?

Answer 6

Deflect food away from packing in the tooth

Question 7

Generally what cusps are the functional cusp?

Answer 7

Maxillary = palatal
Mandibular = labial

Question 8

Generally what cusps are the guiding cusp?

Answer 8

Maxillary = buccal
Mandibular = lingual

Question 9

Function of functional cusp?

Answer 9

Ensure adequate vertical dimension is maintained

Question 10

Why is it important to look at patients occlusion before restorations?

Answer 10

Need to replicate the same point of contacts and match the morphological accuracy

Question 11

What is the most important feature to reproduce in restorations?

Answer 11

Ridges to deflect the food

Question 12

Most likely cause of failure for an amalgam restoration that has been there for a long time?

Answer 12

Occlusion - heavy forces have caused it to break.

when it was first fitted it met occlusion, but occlusion changes over time

Question 13

How can you check if it is occlusion causing failure of a restoration?

Answer 13

Mark up ICP and excursion using articulating paper - see if there are any RCP’s

Question 14

What is often a good treatment for a failed restoration due to occlusion?

Answer 14

Shortening the opposing cusp so the restorative interface isn’t overloaded

Question 15

What is fremitus?

Answer 15

Vibration or movement of teeth when teeth come into contact

Question 16

List 7 signs of occlusal instability

Answer 16

Fremitus
Drifting, rotation, over-eruption
Localised fractures
Loss of restorations
Abfraction
vertical bony defects
Pain

Question 17

Why not leave a restoration out of occlusion?

Answer 17

Over-eruption and drifting of restored tooth leading to premature contacts causing interference and deflections at a later date