Occlusion 2: Dynamic occlusion

Question 1

what is occlusion?

Answer 1

The contact relationships of teeth or equivalent

Question 2

what is articulation?

Answer 2

The dynamic relationships of the teeth when in sliding contact

Question 3

what is jaw relationship?

Answer 3

Positional relationship which the mandible bears to the maxilla

Question 4

what is the rest/postural position?

Answer 4

At rest- teeth are slightly apart

Question 5

how is the rest/postural position maintained?

Answer 5

minimal muscle activity or muscle elasticity

Question 6

what is true with the rest/postural postition?

Answer 6

it remains reproducible throughout life in both senate and edentulous subjects ( no teeth)

Question 7

what is the intercuspal position?

Answer 7

Maximal intercupsation (where cusps fit together as well as they can)

Question 8

what is the retruded contact position (RCP)?

Answer 8

condyles retruded in the glenoid fossa , 1-2mm posterior to ICP

Question 9

what is the clinical significance of RCP?

Answer 9

• symmetrical retrusion

- gives a reproducible relationship between the maxilla and mandible

Question 10

what is the occlusal vertical dimension (OVD)?

Answer 10

• the face height with the teeth in ICP
•  measured between two arbitrary points (under nose to chin)
•  governed by the height of the teeth

Question 11

what is used to measure face height?

Answer 11

willis gauge

Question 12

what is rest/postural vertical dimension (RVD) ?

Answer 12

-face height with mandible in rest / postural position
- measured between two arbitrary points
- this should not alter significantly throughout
life

Question 13

what is the freeway space (FWS)?

Answer 13

• the space between teeth in rest position
•  difference between RVD and OVD
•  2‐5mm

Question 14

LOOk up shape of the border movements of the mandible.

Answer 14

maximum protrusion , ICP,RCP,maximum opening, lower extent of retruded hinge arc

Question 15

when moving the jaw laterally, what side is the working side?

Answer 15

the side to which the jaw moves

Question 16

what is teeth contact governed be?

Answer 16

• canine guidance

- group function

Question 17

what happens on the non-working side?

Answer 17

• teeth do not contact (dislude)

- occasional contact can occur

Question 18

what action does the condyle have on the working side?

Answer 18

• condyle rotates around vertical axis

- lateral bodily movement - Bennet movement

Question 19

what action does the condyle have on the non-working side?

Answer 19

• condyle moves downwards

- forwards over eminence and moves medially

Question 20

what is the balanced occlusion concept?

Answer 20

Tooth contact during excursions at both working and non‐working sides

Question 21

why is balanced occlusion concept ideal for F?F dentures?

Answer 21

maintains stability

– control cusp shape / tooth position and orientation

Question 22

when can balanced occlusion concept not exist?

Answer 22

in normal dentate occlusion