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Orthodontics > Classification of malocclusion > Flashcards

Classification of malocclusion Flashcards

1
Q

A brachycephalic relationship is when?

A

Larger than average cranial width.

Broad, square head shape with low mandibular plane angle

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2
Q

A brachyfacial relationship is when?

A

Broad square face with strong chin, flat lips, low mandibular plane angle, straight profile

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3
Q

Dolicocephalic is?

A

Narrower cranial width, low and narrow shape with high mandibular plane angle

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4
Q

Dolicofacial?

A

Low, narrow face with high mandibular plane angle

Convex profile with poor chin and anterior-posterior height imbalance

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5
Q

What is the lipline?

A

The amount of tooth and gingival tissue exposed at rest

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6
Q

What is lip incompetence?

A

When the patient can’t have the lips in contact while relaxed without showing muscle strain

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7
Q

What are the three possible shapes of the dental arches?

A

Elliptical, square, or tapering

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8
Q

What is angle classification based off of?

A

The relationship between the MB cusp of the maxillary 1st molar and the buccal groove of the mandibular 1st molar

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9
Q

What is class 1 occlusion?

A

Normal occlusion where the MB cusp of the max 1st is aligned with the buccal groove of the mandibular 1st

Coincident midlines and normal overbite/overjet

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10
Q

What is class 1 malocclusion?

A

Normal molar relationship but may have crowding, misalignment, etc.

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11
Q

What is class 2 occlusion?

A

Buccal groove of the mandibular 1st is too far distal

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12
Q

Describe the 2 divisions of class 2 malocclusion

A

Division 1 is when the maxillary anteriors are proclined and there is a large over jet

Division 2 is when the maxillary anteriors are retroclined and a deep overbite exists

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13
Q

What is class 3 malocclusion?

A

The buccal groove of the 1st molar is too far mesial

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14
Q

What is over jet?

A

The distance between the labial part of the mandibular incisors and the incisal edge of the maxillary incisors

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15
Q

What is a functional crossbite?

A

Occlusal interference causing the mandible to shift anteriorly or laterally to achieve maximum occlusion

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16
Q

What is overbite?

A

Amount of overlap of the mandibular anteriors by the maxillary anteriors when measured perpendicular to the occlusal plane

17
Q

What is an open bite?

A

When there is no vertical overlap

18
Q

What happens in ankylosis?

A

There is fusion of the teeth and alveolar bone leading to teeth in the infra version position, they don’t fully erupt

19
Q

What type of radiograph do orthodontists use?

A

Lateral cephalometric

20
Q

When someone has a hyper divergent skeletal pattern what does this mean?

A

Excessive divergence of the skeletal planes

21
Q

What oral abnormalities are seen in those with hyper divergent skeletal pattern?

A

Steep mandibular plane angel, long lower face with open bite, lip incompetence, and class 2 occlusion

22
Q

What is dentoalveolar protrusion?

A

Anterior teeth are positioned forward of the normal limits of the basal bone, can occur on one arch or both

23
Q

What is true or skeletal class 3?

A

Retrusive maxillary arch or preotrusive mandibular arch

24
Q

How do you correct a skeletal class 3?

A

Surgery

25
Q

What is a pseudo class 3?

A

When dental interference causes a functional shift.

26
Q

What is a class 3 subdivision?

A

Normal class 1 on one side and class 3 on the other

27
Q

When planes are hypo divergent what kind of relationship is formed?

A

Deep overbite

28
Q

What is a normal overbite relationship?

A

10-20% overlap or about 1 mm

29
Q

What happens at 100% overbite?

A

Palatal impingement

30
Q

Why use a space maintainer?

A

If a root is developing slowly, maintain space for it. Only used on one tooth

31
Q

When to use a distal shoe?

A

When the primary 2nd molar is lost early, the permanent 1st hasn’t erupted yet. Leaves space for that molar

32
Q

What do you use with bilaterally missing teeth?

A

Nance holding arch

33
Q

What does a nance holding arch do?

A

Holds the molars back so if one is lost prematurely, space remains

34
Q

What is the biggest contributor to occlusion and dental issues?

A

Genetics

Orthodontics (5 decks)

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