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Orthodontic principles 2020 > Lecture 9 > Flashcards

Lecture 9 Flashcards

1
Q

What is the approximate cost for six month smiles?

A

-$3000-4,500

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2
Q

What is the first key to normal occlusion?

A

-Molar relationship

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3
Q

where should the mesiobuccal cusp of the maxillary first molar be in ideal occlusion?

A

-In line with the buccal groove on the mandibular first molar

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4
Q

What is the second key to normal occlusion?

A

-Crown angulation or tip

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5
Q

What is the angle between the long axis of the brown and a line bearing 90 degrees from the occlusal plane?

A

-Degree of crown tip

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6
Q

T/F Normal occlusion is dependent upon proper distal crown tip, especially of the upper anterior teeth since they have the longest crowns

A

True

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7
Q

What is the third key to normal occlusion?

A

-Crown incliniation

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8
Q

What is a plus reading in crown incliniation?

A

-If the gingival portion of the crown is lingual to the incisal portion

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9
Q

What is the fourth key to normal occlusion?

A

-Teeth should be free of undesirable rotations

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10
Q

What is the fifth key to normal occlusion?

A

-Tight contacts

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11
Q

What is the sixth key to normal occlusion?

A

-Occlusal plane

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12
Q

What should the curve of spee look like?

A

-Flat to slight curve

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13
Q

What is the ideal overbite that you want a patient to have?

A

1-2 mm

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14
Q

What is a class I occlusal relationship?

A

-Triangluar ridge of the mesiobuccal cusp of the maxillary first molar articulates with the buccal groove of the mandibular first molar

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15
Q

Where does the maxillary canine lie in a class I occlusion?

A

-Between the mandibular canine and first premolar

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16
Q

What is a class II occlusal relationship?

A

-The mesiobuccal cusp of the maxillary first molar falls approximately between the mandibular first molar and the second premolar

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17
Q

What is a class III occlusal relationship?

A

-The mesiobuccal cusp of the maxillary first molar falls approximately between the mandibular first molar and second molar

18
Q

What is class II division 1 relationship?

A

-Class II molar relationship with protruded maxillary incisors

19
Q

What is a class II division 2?

A

-Calss II molar relationship where the maxillary lateral incisors are tipped labially and mesially where the central incisors are typically retruded

20
Q

When the mandible is proportionally smaller than the maxilla what dental class is formed?

A

-A class II with a convex profile

21
Q

When the mandible is relatively greater than the maxilla what dental class is formed?

A

-Class III relationships with a concave profile

22
Q

When describing primary molar relationships what teeth do you use?

A

-Distal aspect of the second primary molars called the terminal plane

23
Q

What is the normal relationship in the primary dentition?

A

-Flush terminal plane

24
Q

What is the maxillary primate space?

A

-Between the lateral incisors and the canine

25
Q

WHat is the mandibular primate space?

A

-Between the canine and the first molar

26
Q

What are the two types of movement of the mandible?

A
  • Translation

- Rotation

27
Q

What is it called when the body of the mandible is turning about an axis and can happen in three planes?

A

-Rotation

28
Q

What is it called in which all points within a body have identical motion?

A

-Translation

29
Q

During translation what muscle moves the condyle articular disk assembly forward?

A

-Lateral pterygoid muscle

30
Q

The rotational limit of the mandible is how much?

A

12 mm of incisors separation

31
Q

What are mandibular movements limited by?

A
  • TMJ
  • Ligaments
  • Neuromuscular system
  • Teeth
32
Q

What determines anterior movements of the mandible?

A

-The teeth

33
Q

Understanding the function of the anterior teeth and canines and their horizontal and vertical overlap determine what?

A

-The occlusal form of posterior teeth and their restorations

34
Q

The more horizontal overlap of the anterior teeth (increased overjet) what must the posterior cusps look like?

A

-They must be shorter

35
Q

The more vertical overlap of anterior teeth (Increased overbite) what do the posterior cusps look like?

A

-They may be taller

36
Q

A steeply sloped eminence creates a large downward component of condylar movement during lateral and protrusive excrusion and results in what?

A

-early separation of the posterior teeth allowing for taller posterior cusps

37
Q

What is it called when the condyles articulate with the thinnest avascular portion of their respective articular disks with the complex in the anterosuperior position?

A

-Centric Relations

38
Q

T/F Centric relation is independent of tooth contact

A

True

39
Q

Anterior movement of only one condyle will produce what type of movement in the opposite TMJ?

A

-Reciprocal lateral rotation

40
Q

If the inclination of the articular eminence is steeper are the posterior cusps taller or shorter?

A

-Taller

Orthodontic principles 2020 (14 decks)

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