Static Occlusion

Question 1

Static occlusion

Answer 1

Max contact stationary mand teeth

Question 2

Class one occlusion

Answer 2

MF cusp of max 1 molar opposed MB developmental groove on mand 1 molar

Question 3

Mand teeth position to max

Answer 3

Mand teeth are 1/2 tooth in front of max teeth

Question 4

Class 2

Answer 4

Mand teeth are much farther behind than max

Question 5

Class 3

Answer 5

Mand teeth protrude in front of max

Question 6

MIP

Answer 6

Maximum intercuspal position

When teeth are fully closed together

Question 7

3 posterior rules of occlusion

Answer 7

1. Max lingual occl line aligns with mand central line
2. Max central line aligns with mand buccal line
3. mand teeth are half tooth lingual and mesial to max teeth

Question 8

Ideal class 1 relationship

Answer 8

Middle of each max tooth is distal to mand tooth of same type

Max teeth are facial to mand

Max incisors vertically overlap incisal edge of mand teeth

Question 9

VDO

Answer 9

Vertical dimension of occlusion

Distance between two points on max and mand, when teeth are in MIP

Determined by supporting cusps

Question 10

Supporting cusp

Answer 10

Cusps that contact the opposing teeth

Buccal cusps of mandible
Lingual cusps of max

Question 11

Supporting cusp functions

Answer 11

Contact opposing in MIP

Support VDO

Broader more rounded cusps

Contact Near center of tooth

Question 12

Non supporting cusps

Answer 12

Also called guiding/gliding/non centric cusps

Overlap opposing teeth

Buccal cusps of max
Lingual cusps of mand

More pointy and sharp

Question 13

Non supporting cusp functions

Answer 13

Do not contact in MIP

Do not support VDO

Farther from center of tooth

Outer incline has no potential to contact opposing

Question 14

Platform area

Answer 14

Diamond shape area formed my two adjacent marginal ridges

Question 15

Platform area rule for MIP

Answer 15

IDEAL: during MIP, one tooth in opposing arch occludes in one platform area

Question 16

What is the most stable tooth relationship

Answer 16

Tooth to two tooth occlusion

One tooth occludes with two teeth from opposite arch
Aka picket fence

Question 17

Is tooth to one tooth occlusion ok?

Answer 17

Yes, it is less stable than tooth to two tooth occlusion though

Question 18

Posterior supporting cusps are cradled where? Exception?

Answer 18

Cradled in the marginal ridge platform areas

EXCEPT these hit in CENTRAL FOSSA:
ML cusps of upper molars
DB cusps of lower molars

Question 19

Where are non supporting cusps located?

Answer 19

In facial/lingual embrasures or in the developmental grooves of the opposing tooth

Question 20

Overjet vs overbite

Answer 20

Overjet is horizontal overlap

Overbite is vertical overlap

Question 21

Increase in VDO does what to overjet/bite

Answer 21

Increase VDO = decrease overjet/bite

Question 22

VDR and freeway space

Answer 22

Vertical dimension of rest

Distance between two selected points on max and mand when mandible is at rest

Freeway space- space between max and mand at VDR, provides space for tongue
Aka interocclusal rest space

Question 23

Effect of posture on rest position

Answer 23

Leaning back 30 degrees from horizontal plane increases the rest position of the jaw

Question 24

Determinants of occlusion

Answer 24

Teeth
Musculature
TMJ

Question 25

Normal vs premature contact stress of occlusion

Answer 25

Normal 300 psi

Premature contact can be over 2000 psi