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IODC - Orthodontics > Definitions > Flashcards

Definitions Flashcards

1
Q

Definition class I incisors?

A

Lower incisor tip occludes at or below cingulum of upper incisors

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2
Q

Definition class II div I incisors?

A

Lower incisor tip occludes posterior to upper incisor cingulum
Upper centrals normal proclination or retroclined

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3
Q

Definition class II div II incisors?

A

Lower incisor tip occludes posterior to upper incisor cingulum
Upper centrals retroclined

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4
Q

Definition class III incisors?

A

Lower incisor tip occludes anterior to upper cingulum

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5
Q

What is definition of class I molars?

A

Mesiobuccal cusp tip of upper 6 occludes in mid-buccal groove of lower 6

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6
Q

What is definition of class II molars?

A

Mesiobuccal cusp tip of upper 6 occludes anterior mid-buccal groove of lower 6

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7
Q

What is definition of Class III molars?

A

Mesiobuccal cusp tip of upper 6 occludes posterior to mid-buccal groove of lower 6

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8
Q

What is definition of 1/2 class II?

A

Mesiobuccal cusp tip of upper 6 occludes cusp-cusp to mesiobuccal cusp of lower 6

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9
Q

What is definition of 1/2 Class III?

A

Mesiobuccal cusp tip of upper 6 occludes cusp-cusp with ditto-buccal cusp tip of lower 6

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10
Q

What is Frankfort mandibular plane?

A

From lower border of orbit to external auditory meatus

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11
Q

What is average Frankfort mandibular plane?

A

Meets back of head

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12
Q

What is a reduced Frankfort mandibular plane?

A

Meets behind back of head

Associated with increased overbite

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13
Q

What is an increase Frankfort mandibular plane?

A

Plane meets in front

Associated w/ reduced OB and AOB

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14
Q

What is overjet?

A

Distance between upper and lower incisors in horizontal plane

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15
Q

What is the average overjet?

A

2-4mm

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16
Q

What is overbite?

A

The vertical overlap of incisors

Can be complete or incomplete

17
Q

What is average OB?

A

1/3 upper incsiors overlaps lower incisors

18
Q

What is increased OB?

A

> 1/3 upper incisors overlap lower incisors

19
Q

What is reduced OB?

A

<1/3 upper incisors overlaps lower incisors - can be edge-edge

20
Q

What is a lingual cross bite?

A

Buccal cusp of lower molar/premolar occludes lingual to lingual cusp of upper permolar/molars

21
Q

What is a buccal cross bite?

A

Buccal cusp lower molars/premolars occlude buccal to buccal cusp upper molars/premolars

22
Q

What is anterior cross bite?

A

1+ upper incisor occludes lingual to lower incisor

23
Q

What is ROJ?

A

Reverse overjet

All 4 incisors are in XB

24
Q

What is SLOB rule?

A

Same Lingual Opposite Buccal

  • Use OPT (horizontal) and USO (65)
  • If canine move up USO - moved same direction therefore palatally dispalced
  • If canine move down USO - moved opposite direction - buccal displaced

IODC - Orthodontics (18 decks)

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