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DG2013 - Day 6 Orthodontics > Occlusion and Malocclusion > Flashcards

Occlusion and Malocclusion Flashcards

1
Q

What is orthodontics defined as?

A

The study of the growth and development of the teeth and jaws

Also. concerned with the methods of TREATING these dento-facial abnormalities

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2
Q

What % of people have one or more missing wisdom teeth?

A

25%

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3
Q

What are the eruption dates of deciduous dentition:
1. Central incisors
2. Lateral incisors
3. Canines
4. Fist molars
5. Second molars

A
  1. Central incisors = 6 months
  2. Lateral incisors = 8 months
  3. Canines = 18 months
  4. First molar = 12 months
  5. Second molars = 24 months
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4
Q

What is the definition for occlusion?

A

Occlusion = refers to the alignment of the teeth and the way the upper and lower teeth fit together

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5
Q

Define malocclusion:

A

Malocclusion = an occlusion in which there is a malrelationship between the dental arches in any plane of space or in which there are anomalies in tooth position

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6
Q

What is centric occlusion (CO)?

A

CO is a position where the teeth fit together with maximal intercuspation

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7
Q

What is centric relation (CR)?

A

CR is a jaw position dictated by the position of the condyles in the glenoid fossae at the base of skull

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8
Q

Describe the basis of ‘Occlusal Equilibration’ treatment

A

Occlusal equilibration = treatment to make CR and CO the same position

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9
Q

What are Andrew’s 6 keys (1972) to an ideal occlusion?

A
  1. Correct molar relationship
  2. Correct crown angulation (= tip)
  3. Correct crown inclination (= torque)
  4. Teeth in contact
  5. No rotations
  6. Flat occlusal plane
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10
Q

Describe the molar relationship for a class I occlusion:

A

Mesio-buccal cusp of upper first molar occludes with buccal groove of lower first molar

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11
Q

What is the most common cause of malocclusion?

A

Crowding

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12
Q

What is a major cause of crowding?

A

Early loss of deciduous teeth

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13
Q

What is the term for congenitally missing teeth?

A

Hypodontia

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14
Q

What is supernumeracy?

A

Extra tooth of any shape (Mesiodens)

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15
Q

What is supplemental?

A

An extra tooth identical to an existing tooth

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16
Q

List 5 local causes of malocclusion:

A
  1. Abnormalities in the number of teeth
  2. Abnormalities in shape of teeth
  3. Abnormalities in position of teeth
  4. Habits
  5. Pathology
17
Q

Give 3 examples of pathological cause of malocclusion:

A
  1. Periodontal disease
  2. Ankylosed teeth
  3. Dental or jaw cysts

DG2013 - Day 6 Orthodontics (10 decks)

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