Dynamic Occlusion

Question 1

define occlusion

Answer 1

the contact relationship of teeth or equivalent

Question 2

define articulation

Answer 2

the dynamic relationship of teeth when in sliding contact (chewing -> movement)

Question 3

define jaw relationship

Answer 3

positional relationship which the mandible bears with to the maxilla

Question 4

rest/postural position

where are the teeth in the rest position?

Answer 4

apart

Question 5

what is the clinical significance of the rest position?

Answer 5

it is reproducible (the same throughout life) so good landmark e.g. full dentures

Question 6

how is the intercuspal position categorised?

Answer 6

angles classification
incisor relationship

Question 7

what is the angles classification?

Answer 7

relationship between the MB cusp of U6 and MB groove of L6

Question 8

what is a class I angles classification?

Answer 8

mesiobuccal cusp of U6 in line with mesiobuccal groove of L6

Question 9

what angles classification is this?

Answer 9

class I

Question 10

what is a class II angles classification?

Answer 10

mesiobuccal cusp of U6 anterior to mesiobuccal groove of L6

Question 11

what angles classification is this?

Answer 11

class II

Question 12

what is a class III angles classification?

Answer 12

mesiobuccal cusp of U6 posterior to mesiobuccal groove of L6

Question 13

what angles classification is this?

Answer 13

class III

Question 14

what is incisor relationship?

Answer 14

relates lower incisor tip to cingulum plateau of the upper incisor

Question 15

what is a class I incisor relationship?

Answer 15

lower incisal edge contacts with upper cingulum plateau

Question 16

what incisor relationship is this?

Answer 16

class I

Question 17

what is a class II div I incisor relationship?

Answer 17

lower incisal edge posterior to upper cingulum plateau

and overjet

Question 18

what incisor relationship is this?

Answer 18

class II div I

Question 19

what is a class II div II incisor relationship?

Answer 19

lower incisal edge posterior to upper cingulum plateau

and overbite

Question 20

what incisor relationship is this?

Answer 20

class II div II

Question 21

what is a class III incisor relationship?

Answer 21

lower incisal edge anterior to upper cingulum plateau (underbite)

Question 22

what incisor relationship is this?

Answer 22

class III

Question 23

what is an overbite?

Answer 23

overlap in vertical plane

Question 24

what is an open bite?

Answer 24

no overbite or tooth contact

Question 25

what is an overjet?

Answer 25

overlap in horizontal plane

Question 26

what is the retruded contact position (RCP or ligamentous position)?

Answer 26

Condyles retruded into glenoid fossa Do it by getting the patient to curl their tongue back

Question 27

what is the clinical significance of the retruded contact position RCP?

Answer 27

Symmetrical retrusion so gives a reproducible relationship between the maxilla and mandible Good if patient cant close jaw reproducibly e.g. missing teeth, wondering jaw

Question 28

what is the Occlusal vertical dimension (OVD)

Answer 28

The face height between 2 reference points when the teeth are in ICP (chin and nose) Measured using Willis gauge

Question 29

what is the rest/postural vertical dimension (RVD)?

Answer 29

The face height between 2 reference points when the teeth are in RP

Question 30

what is the freeway space?

Answer 30

The space between the teeth in rest position FWS = RVD - OVD

Question 31

anatomical guide planes limit the movement of the jaws name three

Answer 31

Incisal guidance Cuspal inclines TMJ

Question 32

understand the border movements of the mandible in the sagittal plane

Question 33

understand this

Question 34

what is the balanced occlusion concept?

Answer 34

contact on both sides when making excursions Ideal for edentulous patients -> full dentures

Question 35

is balanced occlusion possible?

Answer 35

not in dentate patients