Occlusion in Restorative Dentistry

Question 1

Why important to study occlusion in relation to restorative work?

Answer 1

Failure restoration
Fractured teeth and restoration
Overeruption/tilting
Fractured crowns
Wear of teeth 
Localised periodontitis 
Facial pain

Question 2

What teeth common see over eruption?

Answer 2

Upper molars

Often due large under contoured amalgam on lower teeth/ lack opposing teeth

Question 3

Issue w/ overuption?

Answer 3

Create unfavourable contact in excursion = fracture

Question 4

How avoid fracture of crowns when providing?

Answer 4

If heavy occlusion use metal backings

Question 5

What issue of tx when have tooth wear?

Answer 5

Need increase VD - complications

Question 6

If have large occlusal load on one tooth what are periodontal effects?

Answer 6

See funnel shaped bone loss

Question 7

What is ICP?

Answer 7

Intercuspal position

Position of mandible when maximum intercuspation of the teeth

Question 8

When may be hard to see ICP?

Answer 8

Loss of cusps - lost teeth/ tooth wear

Question 9

What is RCP?

Answer 9

Related centric relation - first tooth contact when condyle fully seated in glenoid fossa

Question 10

Relationship of ICP and RCP?

Answer 10

Don’t usually coincide - close to RCP and slide ICP

Question 11

What want to assess in slide ICP to RPC?

Answer 11

If vertical or horizontal competent

Question 12

What expect to see if slide RCP to ICP if no tooth wear?

Answer 12

More significant vertical component

Question 13

What is centric relation?

Answer 13

Relation of mandible to maxilla when condyles seated midmost uppermost position in glenoid fossa
Jaw relationship nothing to do with teeth

Question 14

Adv of CR?

Answer 14

Most optimum position neurousculature system

MoM able fully relax

Question 15

What is range of movement within CR called?

Answer 15

Hinge movement

Question 16

What is terminal hinge axis?

Answer 16

Condyles hinge about horizontal axis when in CR

Question 17

What terminology use to describe lateral excursion?

Answer 17

Working side

Non-working side

Question 18

Difference between working and non-working side?

Answer 18

Working side - side jaw moving to

Non-working side - opposite side jaw moving to

Question 19

What can see on working side?

Answer 19

Group or canine guidance

Question 20

What is canine guidance during lateral excursion?

Answer 20

Ideal as canine well-formed take load

Only canine in contact - disocclusion all teeth

Question 21

What happens if canine wears?

Answer 21

Guidance transferred to other teeth

Question 22

What is group function?

Answer 22

When have +1 guiding teeth during lateral excursion

Less ideal

Question 23

What expect/ideal see non-working side during lateral excursion?

Answer 23

Posterior teeth should separate to avoid destructive forces

Question 24

What movement described condyles in lateral excursion?

Answer 24

Working side = Benett movement

NWS = Benett Angle

Question 25

What is Bennett movement?

Answer 25

Shift of mandible towards working side following by rotation around vertical axis WS condyle move lateral

Question 26

What is Bennet angle?

Answer 26

7.5 degree | NWS condyle moves down, forwards and inwards

Question 27

Briefly describe what expect see protrusive excursion in different incisor class?

Answer 27

Class I - anterior guidance Class II div I - posterior initial, than anterior Class II div II - heavy anterior Class III - posterior

Question 28

What range of movement expect to see CR?

Answer 28

25mm

Question 29

How find CR?

Answer 29

Pt tongue back palate - encourage condyle seat mid-most upper most position Dawson technique CR manipulation

Question 30

How to do CR manipulation?

Answer 30

Stabilise head Fingers lower border mandible, thumbs on symphysis Manipulate jaw hinges open and closed - freely Guide condyles up with little fingers

Question 31

Issue CR manipulation?

Answer 31

Depends pt ability to relax - use anterior jig if struggling

Question 32

Does occlusion matter when construction splint for TMJ?

Answer 32

Yes, want splint in CR for neuromuscular dissociation

Question 33

What occlusion use in complete dentures?

Answer 33

RCP =ICP | Reproducible and comfortable for pt

Question 34

What is posset envelope of movement?

Answer 34

Traces movement of mandible through extreme border movements

Question 35

What does Posselt envelope of movement record?

Answer 35

ICP and RCP - see slide Forward movement into protrusion Maximum protrusion Maximum opening

Question 36

Difference posselt diagram of dentate and edentulous mouth?

Answer 36

Similar as retain border activity as limited by musculature/condyle activity No slide RCP to ICP and RCP=ICP