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Occlusion > Ortho > Flashcards

Ortho Flashcards

1
Q

What is malocclusion?

A

A deviation from normal occlusion.

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2
Q

Name three conditions associated with malocclusion.

A

Tilting, bodily displacement, and rotation.

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3
Q

What is Lischer’s terminology used for?

A

Identifying malpositioning of individual teeth in relation to the line of occlusion.

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4
Q

Define labioversion.

A

Displacement of a tooth toward the lips.

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5
Q

Define linguoversion.

A

Displacement of a tooth toward the tongue.

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6
Q

What is torsiversion?

A

Rotation of a tooth around its axis.

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7
Q

Define buccoversion.

A

Displacement of a tooth toward the cheek.

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8
Q

Define supraversion.

A

A tooth positioned above the occlusal plane.

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9
Q

Define mesioversion.

A

Displacement of a tooth toward the midline.

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10
Q

Define infraversion.

A

A tooth positioned below the occlusal plane.

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11
Q

Define distoversion.

A

Displacement of a tooth away from the midline.

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12
Q

What is transversion?

A

A tooth displaced in a different location within the dental arch.

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13
Q

What is the anteroposterior malrelation of dental arches?

A

Deviation in the forward or backward relationship of arches.

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14
Q

What is excessive overjet?

A

Horizontal overlap of incisors beyond 2 mm.

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15
Q

Define edge-to-edge bite.

A

The incisors meet edge to edge with no overlap.

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16
Q

What is anterior crossbite?

A

A reverse horizontal relationship of anterior teeth.

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17
Q

What is posterior crossbite?

A

An abnormal buccolingual relationship of posterior teeth.

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18
Q

What is a unilateral posterior crossbite?

A

Crossbite affecting one side of the dental arch.

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19
Q

Define scissors bite.

A

A type of crossbite where the teeth occlude abnormally, with excessive buccal overlap.

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20
Q

What is excessive overbite?

A

Deep vertical overlap of incisors.

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21
Q

What is open bite?

A

Lack of vertical overlap between upper and lower teeth.

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22
Q

Define anterior open bite.

A

Open bite in the anterior segment of the dental arches.

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23
Q

Define posterior open bite.

A

Open bite in the posterior segment of the dental arches.

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24
Q

What is skeletal class I?

A

Normal anteroposterior relation of the mandibular basal arch to the maxillary basal arch.

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25
Q

What is skeletal class II?

A

Mandibular basal arch retruded relative to the maxillary basal arch.

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26
Q

Define skeletal class III.

A

Mandibular basal arch protruded relative to the maxillary basal arch.

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27
Q

What is the average normal overjet?

A

0-2 mm.

28
Q

What is the normal vertical overlap of incisors?

A

One-third of the lower incisors or 2-3 mm.

29
Q

Define orthognathic profile.

A

A normal anteroposterior skeletal relationship.

30
Q

What is a retrognathic profile?

A

A retruded mandibular basal arch.

31
Q

Define prognathic profile.

A

A protruded mandibular basal arch.

32
Q

What is the purpose of Angle’s classification?

A

To describe malocclusion based on the mesiodistal relations of the first molars.

33
Q

Define Angle’s class I.

A

Normal molar relation but with crowding or malposed teeth.

34
Q

Define Angle’s class II.

A

Lower molar positioned distally to the upper molar.

35
Q

Define Angle’s class III.

A

Lower molar positioned mesially to the upper molar.

36
Q

What are the two divisions of Angle’s class II?

A

Division 1 (protrusion of upper incisors) and Division 2 (retrusion of upper incisors).

37
Q

What is Dewey’s modification of Angle’s class I?

A

Further classification based on anterior crowding or individual tooth displacement.

38
Q

What is Dewey’s type 1 modification?

A

Bunched or crowded maxillary anterior teeth.

39
Q

What is Dewey’s type 3 modification?

A

Maxillary incisors in linguoversion to mandibular incisors.

40
Q

Define buccoclusion.

A

Buccal displacement of teeth or dental arches.

41
Q

Define linguoclusion.

A

Lingual displacement of teeth or dental arches.

42
Q

What is supraclusion?

A

An abnormally deep overbite of a group of teeth.

43
Q

What is infraclusion?

A

Open bite of a group of teeth or dental arches.

44
Q

What does Simon’s classification consider?

A

Relationship of dental arches to the three planes of space.

45
Q

Name the three planes in Simon’s classification.

A

Frankfort horizontal, mid-sagittal, and orbital planes.

46
Q

What is protraction in Simon’s classification?

A

Anterior placement of the dental arch to the orbital plane.

47
Q

Define retraction in Simon’s classification.

A

Posterior placement of the dental arch to the orbital plane.

48
Q

What is contraction in Simon’s classification?

A

Dental arch closer to the mid-sagittal plane.

49
Q

What is distraction in Simon’s classification?

A

Dental arch farther from the mid-sagittal plane.

50
Q

Define attraction in Simon’s classification.

A

Dental arch nearer to the Frankfort horizontal plane.

51
Q

Define abstraction in Simon’s classification.

A

Dental arch farther from the Frankfort horizontal plane.

52
Q

What does skeletal deep bite indicate?

A

Excessive vertical overlap due to basal arch malrelations.

53
Q

Define skeletal open bite.

A

Lack of vertical overlap due to basal arch malrelations.

54
Q

What is Lischer’s modification to Angle’s classification?

A

Use of the term “version” to describe malpositions.

55
Q

What is the significance of the Frankfort horizontal plane?

A

It serves as a reference for vertical relationships in Simon’s classification.

56
Q

What is an edge-to-edge bite classified as in Dewey’s modification?

A

Type 1 modification of Angle’s class III.

57
Q

What are the limitations of Angle’s classification?

A

It doesn’t differentiate skeletal and dental malocclusion.

58
Q

What is the normal occlusion described by Angle?

A

The mesiobuccal cusp of the upper first molar aligns with the buccal groove of the lower first molar.

59
Q

Define constricted maxillary basal arch.

A

A narrow upper arch, often associated with cleft palate.

60
Q

Define overdeveloped mandibular basal arch.

A

Excessive lateral or anteroposterior mandibular growth.

61
Q

What is deep bite associated with?

A

Excessive vertical overlap.

62
Q

Define open bite.

A

No vertical overlap of incisors.

63
Q

What does the term “constricted maxillary arch” indicate?

A

Narrow maxillary arch structure.

64
Q

What is the significance of basal arches in malocclusion?

A

Determines skeletal dysplasia in malrelations.

65
Q

What is the mid-sagittal plane?

A

Divides the cranium into two equal halves.

Occlusion (6 decks)

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