introduction to occlusion ;)

Question 1

definitions of occlustion

Answer 1

the manner in which the teeth come together when closing the jaw
the relationship between the teeth when moving the mandible

Question 2

how should the teeth work on closign

Answer 2

posteror teeth contact

anterior have light contact only

Question 3

why should posterior teeth contact on closing

Answer 3

molars have a large root SA, 2/3 roots which can take the load and distribute it evenly

Question 4

intercuspal postion

Answer 4

relationship between the maxilla and mandible when the teeth are in maximum intercuspation (when teeth are together)

Question 5

centric relation

Answer 5

the most anterior superior position of the condyle disc assembly within the glenoid fossa
(when the condyle is sitting comfortable in the fossa)
- relationship between mandible and maxilla, nothing to do with teeth

Question 6

centric realtion movment

Answer 6

range of movement within centric realtion

- as long as condyle is within the cavity

Question 7

retruded contact position

Answer 7

first point of contact when the mouth is closing (at the back on the molars)

Question 8

centric relation and ICP

Answer 8

retruded contact position in most people first
then squeeze down further, condyle is pulled forward to enter intercuspal posotion
(discrepancy between ICP and centric relation)

Question 9

how should teeth work on forward movement/protrusion

Answer 9

anterior teeth disclude (separate) the posterior teeth by anterior guidance
- palatal surfaces of the upper anterior teeth dictate the movement of the mandible

Question 10

what happens to the teeth during sideways movement

Answer 10

posterior teeth separate

canine dictates the movement

Question 11

canine guidance in sideways movement

Answer 11

resist sideways forces due to shape
root much bigger than crown
Caine is highly innervated so uses proprioception to prevent load on anterior teeth

Question 12

class one occlusion

Answer 12

lower incision occludes at of below the upper incisorycingulum plateau

Question 13

class one occlusion molar

Answer 13

the mesiobuccal cusp of the permanent maxillary first molar occluded in the buccal groove of the permanent mandibular first molar

Question 14

class two occlusions

Answer 14

lower incisor occludes behind the upper incisor cingulum plateau

Question 15

class two occlusion molar

Answer 15

mesiobuccal cusps of the permanent maxillary first molar occlides medial to the buccal groove of the permanent mandibular first molar (i.e. lower molar tooth is further back)

Question 16

incisors in the class two

Answer 16

correct inclination or proclined (overjet is increased)

or retroclined

Question 17

divisions of class 2

Answer 17

divison 1
- overjet, proclaimed or correct inclinaition
division 2
- upper incisors are retroclined
- overbite

Question 18

overbite vs overjet

Answer 18

overbite is the vertical distance of how the upper incisors cover the lower incisors

overreact
- horizontal distance between the incisors

Question 19

class 3 occlision

Answer 19

lower incisors occlude in front of the upper incisors cingulum plateau or edge to edge

Question 20

class 3 molar occlusion

Answer 20

mesiobuccal cusp of the permanent maxillary first molar occludes distal to the buccal groove of permanent mandibular first molar

Question 21

anterior open bite

Answer 21

only in contact with back teeth
large amount of space between the anterior teeth
- all movement based on the back teeth

Question 22

what is the movement of the mandible dictated by

Answer 22

position of the condyle in the fossae
condylar pathway along the articular eminence
teeth interfering with this border movement

Question 23

protrusive eccursion

Answer 23

condole move forwards and downwards

Question 24

what is the working side

Answer 24

where there is contact between the occlusal surfaces of teeth and where the lower teeth are moving to that side
e.g. think about chewing gum

Question 25

what would be the ideal occlustion

Answer 25

ICP = CR
forces directed through the long axis of the teeth
anterior guidance in protrusion
canine guidance in lateral excursion
mutual protection

Question 26

when would we be able to make an ideal occlusion

Answer 26

when making entire set of dentures

Question 27

Occlusal schemes

Answer 27

ideal occlusion
group occlusion
balanced occlusion

Question 28

group occlusion

Answer 28

all of the teeth are contacting we move to the working side, group of teeth functioning rather than canine guided when moving sideways

Question 29

balanced occlusion

Answer 29

artificial, used in dentures to keep them stable by attempting to make the sids balance and for teeth to mesh together in each excursion