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Pedo/Ortho > Occlusion > Flashcards

Occlusion Flashcards

1
Q

what Angle class does the Triangular ridge of MB cusp of Max 1st molar articulates in B groove of Man 1st molar?

A

Class 1

**max canine between man canine and 1st premolar

*70% of pop

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2
Q

what percentage of pop has class 2?

A

25%

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3
Q

where does the MB cusp of Max 1st molar fall in angle class 2?

A

between 1st molar and 2nd premolar

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4
Q

in angle class 2 what direction do the max incisors tip?

A

bucally

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5
Q

what does “sunday bite” mean?

A

patient typically functions in a class 2 bite, but can go into class 1

*this can trick a dentist

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6
Q

Class 2 division 1

A

class II molar relationship with protruded Max incisors

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7
Q

class 2 division 2

A

max lat incisors tipped labially and mesial, centrals retruded

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8
Q

Describe class angle class 3 bite

Molars and canines

A
  • MB cusp of Max 1st molar falls between Man 1st and 2nd molars
  • Max canine distal to Man canine
  • 5% of pop
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9
Q

what is a skeletal class 1?

A

max and mand are similar in poportion

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10
Q

what is skeletal class 2?

A

mand is smaller than max

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11
Q

what is a skeletal class 3

A

mand is larger than max

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12
Q

what is the terminal plane and what is it used for?

A

Distal aspect of 2nd primary molars, used to determine amount of shift

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13
Q

What is leeway space?

A

size differential between primary posterior teeth and permanent canine and premolars

  • 2.5/side uppers
    1. 5/side lowers

*example perm premolar (smaller) erupts where there the primary molar (larger) was

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14
Q

what is a flush terminal plane relationship?

A

Molars are directly on top of each other.

normal relationship for primary teeth. Will shift to class 2, then eventually class 1 when primary molars are lost

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15
Q

What is a mesial step relationship?

A

Distal surface of Man molar mesial to Max

*usually shifts to class 1, but can shift to class 3

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16
Q

what is a distal step relationship?

A

Distal surface of Man molar Distal to Max

**Can shift to Class II or End to end

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17
Q

what is primate spacing?

A
  • gap between Max lateral incisors and canines

- Gap between Man canines and 1st molars

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18
Q

6 keys to normal occlusion?

A 
1-molar relationship
2-Crown angulation (gingiva is distal)
3-crown inclination (inclination)
4-elimination of rotation
5-tight contacts
6-flat occlusal plane
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19
Q

what is a facial/buccal crossbite?

A

posterior maxillary facial cusps contact mandibular fossa

*max non-functional cusps are in the fossa rather than functional ones

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20
Q

what is Lingual crossbite/scissor bite?

A

lingual inclines of maxillary lingual cusps contact buccal inclines of mandibular teeth

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21
Q

what muscle controls translation?

A

Lateral pterygoid muscle contracts and moves condyle-articular disk assembly forward

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22
Q

in rotation, how many mm before incisor separation?

A

12mm

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23
Q

what are the Overbite and overjets for anterior open bite?

A

negative overbite with positive or negative overjet

24
Q

what do the max incisors cause in an anterior deep bite?

A

can cause retrusive force on mandible

25
Q

in increased overjet the posterior cusps are ________ and in overbite the posterior cusps are ______

A

shorter, longer

26
Q

what are the glenoid fossa and condylar disk covered with?

A

avascular fibrous tissue

27
Q

what is the articular disk?

A

Dense connective tissue

28
Q

what is the posterior aspect of the articular disk attached to?

A

retrodiscal tissue which is connected to the posterior wall of articular capsule

29
Q

what are the medial and lateral walls of the articular disk connected to?

A

poles of condylar process

30
Q

what is the anterior wall of the articular disk connected to?

A

superior lateral pterygoid muscle and capsule

31
Q

what does the articular eminence do?

A

causes early separation of posterior teeth (taller posterior cusps) and creates the downward movement.

32
Q

more lateral movement in glenoid fossa results in what?

A

shorter cusp height

33
Q

immediate slide in the medial walls in glenoid fossa results in what?

A

shorter cusp tips

34
Q

Is condylar guidance fixed or changeable?

A

fixed and unalterable

35
Q

steeper condylar guidance results in what kind of cusp tips?

A

taller

*greater vertical component

36
Q

what determines anterior guidance?

A

Overbite, overjet, and incisor angle

**can be altered by ortho

37
Q

T/F Cuspal inclines mirror guidance angles

A

True

38
Q

if the occlusal plane is more parallel to condylar guidance, what happens to the cusp tips?

A

shorter

39
Q

if the curve os spee is acute, what happens to the cusp tips in anterior and posterior?

A

Anterior: Tall
Posterior: Short

40
Q

T/F CR has translation?

A

False. No translation and is independent of tooth contant

*very hard to locate/define

41
Q

Highest forces and longest duration of contact occur at the intercuspal position of functional or non functional cusps?

A

Functional

**Aka supporting cusps, aka holding cusps

42
Q

Do functional or non functional cusps have sharper tips?

A

non-functional

**aka non-supporting, aka non-centric, aka non-holding

43
Q

Laterotrusion results in movement on the working or non-working side?

A

working side.

44
Q

what 3 things effect medio and laterotrusion?

A

1-condylar distance
2- tooth distance from condyle
3-tooth distance from midsagittal plane

45
Q

greater intercondylar distance results in?

A

smaller angle between Medio and laterotrusion angle

46
Q

Greater distance between tooth and condyle results in?

A

Wider Medio and laterotrusion angle

47
Q

greater tooth distance from midsagittal plane reuslts in?

A

wider angle between Medio and laterotrusion angle

48
Q

what is Tooth-to-tooth, cusp to marginal ridge relationship?

A

maxillary lingual cusp contact distal marginal ridge of single tooth

49
Q

which type of functional cusp contact is most stable?

A
  • tooth-to-two tooth

- cusp to two marginal ridges contact

50
Q

Tripod contact is what kind of functional cusp contact?

A

Tooth-to-tooth cusp-fossa contact

51
Q

when equilibrating occlusion do you adjust mediotrusive or laterotrusive contacts first?

A

Mediotrusive, then medio and latero together

52
Q

what ligament limits mandibular rotation on opening?

A

Temporomandibular ligament

53
Q

what ligament limits separation between condylar process and articular disk?

A

Sphenomandibular ligament

54
Q

what ligament limits separation between condylar process and articular disk, limits forward movement of mandible?

A

Stylomandibular ligament

55
Q

what are the 4 muscles of mastication?

A

1-masseter
2-temoral
3-Medial pterygoid
4- lateral pterygoid

56
Q

what are the 3 suprahyoid muscles and what do they do?

A

1-geniohyoid
2-mylohyoid
3-digastic (posterior and anterior belly)

*they elevate hyoid bone or depress and retract the mandible

Pedo/Ortho (5 decks)

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