introduction to occlusion

Question 1

occlusion

Answer 1

the tooth to tooth relationship between the maxillary and mandibular teeth when the jaws are in a fully closed position

Question 2

primate spaces

Answer 2

spaces between primary teeth that allow for the permanent teeth to erupt without crowding. occurs as the arches start to grow - so this is seen at approximately age 5

Question 3

largest primate spaces

Answer 3

maxillary - between canines and laterals

mandibular - between canines and first molars

Question 4

leeway spaces

Answer 4

primary teeth set occlusion pattern for permanent

deciduous molars and canines wider than permanent premolars and canines

space saved during mesial drift of permanent molars

Question 5

mesial step

Answer 5

most children - mandibular molars are more mesial than maxillary molars

Question 6

flush terminal plane

Answer 6

mandibular molars and maxillary molars are even

Question 7

distal step

Answer 7

least common - mandibular molars more distal than maxillary molars

Question 8

primary curve of spee

Answer 8

minimal

Question 9

adult curve of spee

Answer 9

steeper

Question 10

normal curve of spee

Answer 10

starts around the mesial of the 1st molar

Question 11

premature curve of spee

Answer 11

starts closer to the premolars

Question 12

late curve of spee

Answer 12

starts closer to the posterior of the 1st molar

Question 13

sphere of monson

Answer 13

curve of spee and wilson combined

Question 14

centric relation

Answer 14

a relationship of the upper jaw to the lower jaws

home base for the jaws

defined as the most retrueded relationship of the mandible to the maxilla

Question 15

centric occlusion

Answer 15

a relationship of the upper teeth to the lower teeth

Question 16

ideally, when the mandible is in CR…

Answer 16

the dentician should be in the centric occlusion

Question 17

overjet

Answer 17

horizontal measurement of anterior overlap

Question 18

underjet

Answer 18

horizontal distance of anterior teeth in crossbite

Question 19

interdigitation

Answer 19

maximum touching of maxillary and mandibular arches

Question 20

maximum intercuspation

Answer 20

the maximum closure of the maxillary and mandibular arches

Question 21

Class I

Answer 21

mesognathic

MB cusp of max 1st molar - mesiobuccal groove of mand 1st molar

max canine - mand canine & mand 1st molar

Question 22

inter-arch malocclusions

Answer 22

1. midlines off-center
2. posterior crossbite
3. anterior crossbite
4. open bite (anterior or posterior)

Question 23

intra-arch malocclusions

Answer 23

supraversion - above occlusal plane
infraversion - below occlusal plane
drifted mesial - tooth extracted
lingoversion - tooth positioned more lingual
torsoversion - rotated or twisted

Question 24

class II

Answer 24

retrognathic profile

Question 25

class III

Answer 25

prognathic profile

Question 26

centric occlusion

Answer 26

relationship of teeth in opposite arches; static position

Question 27

abnormal proximal contacts

Answer 27

open contacts (extraction/ large maxillary frenum)
drifting (due to extraction)
pathologic migration (disease)

Question 28

functional occlusion

Answer 28

associated with performance

all contacts during function of the oral cavity

Question 29

functional contacts

Answer 29

normal contacts between max and mandibular teeth

momentary contacts

Question 30

parafunctional contacts

Answer 30

abnormal contacts

occlusal habits and neuroses

Question 31

class I molar relationship

Answer 31

MB cusp of max 1st molar -buccal groove of mandibular 1st molar

Question 32

class I canine relationship

Answer 32

max canine - mand canine and mand 1st premolar

Question 33

conditions that occur in class I malocclusion

Answer 33

malposition - individual teeth or groups of teeth

crowded anterior teeth

protruded or retruded max incisors

Question 34

class II, division I

Answer 34

retrognathic profile

buccal groove of mand 1st molar - distal to MB cusp of max 1st molar

canine relationship: distal of mand canine distal to mesial of max canine

Question 35

class II, division 2

Answer 35

buccal groove of mand 1st molar distal to MB cusp of max 1st molar

canine relationship - distal of mandibular canine distal to mesial of max canine

Question 36

class III

Answer 36

molar relationship: buccal groove of mand 1st molar - mesial to MB cusp of max 1st molar

canine relationship - distal of mand canine mesial to mesial of max canine

Question 37

partially anodontia

Answer 37

throws off molar relationship

uses canines to classify

Question 38

edentulous

Answer 38

artificial occlusion