Ideal Occlusion

Question 1

What occlusal scheme is ideal in complete dentures?

Answer 1

Balanced occlusion

Question 2

What is gnathological function?

Answer 2

Trying to get teeth function in excursion simultaneously

Question 3

Principles of ideal occlusion?

Answer 3

Distribution of load in favourable way

Mutual protection from unfavourable loads

Question 4

What does RCP=ICP mean?

Answer 4

When closed posterior teeth contact w/ light contact anterior teeth - occlusal load through axis molar
Condyles positioned distribute load w/ minimal musculature involvement

Question 5

What does ICP require?

Answer 5

Musculature activity to position condyle/disc

Question 6

Is RCP=ICP common?

Answer 6

No 90% RCP doesn’t equal ICP

Question 7

What to be aware of in bruxism?

Answer 7

Function on RCP contacts = damage restorations/ facets on sound teeth
Increased musculature activity in ICP

Question 8

How distribute force favourably?

Answer 8

Occlusal load down long axis of tooth

Question 9

What happens if occlusal contact results in horizontal forces?

Answer 9

Wear facet
Tooth movement
Bone loss
Fractures

Question 10

Why is posterior disocclusion beneficial?

Answer 10

Anterior teeth disocclude posterior teeth preventing lateral forces on posterior teeth

Question 11

Example of when see posterior disocclusion?

Answer 11

Lateral and protrusive movements - anterior teeth guide

Question 12

When might see posterior contacts during lateral/protrusive movements?

Answer 12

Working side = group function

Unfavourable
Non-working side interference
Protrusive interference

Question 13

What is anterior guidance?

Answer 13

Palatal surface of upper incisor dictate mandibular movement in protrusion

Question 14

Why is canine so useful in occlusion?

Answer 14

Morphology
Good crown: root
Distance from hinge
Highly innervation = proprioception

Question 15

What is mutual protection?

Answer 15

In ICP posterior teeth protect anterior teeth

In excursions anterior teeth protect posterior

Question 16

What is group function?

Answer 16

When have multiple contacts on working side

Disocclusion non-working side

Question 17

What is anterior guidance based o?

Answer 17

Incisor relationship

Question 18

What expect to see in class I incisor relationship?

Answer 18

Lower incisor occludes at/below cingulum plateau of upper incision w/ minimal overbite/jet

Question 19

What expect to see in protrusive excursion in class I?

Answer 19

Expect see posterior disocclsuion

Question 20

What expect to see in class I div I incisor relationship?

Answer 20

Lower incisor occluded behind upper cingulum w/ upper incisor being normal or proclinced

Question 21

What expect to see in protrusive excursion in class II div I?

Answer 21

Posterior teeth guide mandibular movement in protrusion due increased space between lower incisor and palatal surface of upper

Question 22

What expect to see in class II div II incisor relationship?

Answer 22

Lower incisor occludes behind cingulum plateau upper incisor - upper incisor retroclined

Question 23

What expect to see in protrusive excursion in class II div II?

Answer 23

Vertical competent of mandible before protrusion w/ exaggerated posterior disocclusion

Question 24

What expect to see in class III incisor relationship?

Answer 24

Lower incisor occlude in front of cingulum plateau

Question 25

What expect to see in protrusive excursion in class III?

Answer 25

Guidance posterior teeth

Question 26

What see AOB?

Answer 26

No contact anterior teeth

Question 27

What expect to see in protrusive excursion in AOB?

Answer 27

Excursions all posterior teeth

Question 28

How deal w/ occlusion in practice?

Answer 28

Know existing occlusion

Know RCP pre and post-operative

Question 29

Difference between conforming and reorganising occlusion?

Answer 29

Conforming - work to occlusion, don’t create unfavourable contact

Reorganise - aim for ideal occlusion

Question 30

What is condylar movement dictated by?

Answer 30

Position condyle in fossa
Condylar pathway on articular eminence
Teeth interfere w/ border movement

Question 31

Advantage of centric relation?

Answer 31

Repeatable

Question 32

When is CR used?

Answer 32

Complete denture
Check RCP
Reorganisation
Making hard splints

Question 33

How find CR?

Answer 33

Hard - neuromusculature system programmed close in ICP

Use:

• Bilateral manual manipulation - Dawson Technique
• Anterior jigs
• Gothic arch tracing

Question 34

How record CR?

Answer 34

Manual manipulation into wax/silicone

Anterior jig w/ silicone