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D1 Spring - Occlusion & Fixed Pros. > 2/21: Posselt's Envelope of Movement > Flashcards

2/21: Posselt's Envelope of Movement Flashcards

1
Q

What is centric relation?

A

Position of the mandible in which the condyles are in the most superior and anterior position in the articular fossae, resting against the posterior slopes of the articular eminences

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2
Q

What is the condyle determined position?

A

Centric relation

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3
Q

When the mandible is in centric relation the condyles can rotate around a horizontal axis up to an opening of _________ mm measured at the central incisors

A

20-25mm

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4
Q

What is pure rotational movement referred to? And the axis is referred to as?

A

Hinge movement; terminal hinge axis

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5
Q

What is maximal intercuspal position?

A

Maxillary and mandibular teeth make maximum surface contact with eachother
- the mandible is elevated as superiorly as possible in the sagittal plane

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6
Q

What is a tooth determined position?

A

Maximal intercuspal position or maximum intercuspation

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7
Q

What position doesn’t provide any information about the TMJ?

A

MI

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8
Q

In most people, ______ does not coincide with ______

A

MIP; CR

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9
Q

Describe the condyle-disc assembly in MIP?

A

Condyle assembly is anterior and inferior and/or medial or lateral or a combination of the above compared to their position in CR

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10
Q

What position are restorations made in with minimal restoration (e.g., amalgam or composite resin restorations, single crowns, etc)?

A

Maximum intercuspation

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11
Q

What is postural pisition?

A

Habitual postural of the mandible when the patient is resting comfortably in the upright position and the condyles are in a neutral unstrained position in the glenoid fossae

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12
Q

Where is there an equilibrium in postural position?

A

Equilibrium between the forces acting on the mandible

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13
Q

How are muscles in postural position?

A

Not totally relaxed; there is a degree of electromyographic activity

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14
Q

What is postural position determined by?

A

The muscles and the forces of gravity

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15
Q

What does postural position NOT give us information on?

A

Condyles or the teeth

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16
Q

How are the teeth positioned in postural position?

A

Teeth are apart and there is a wedge space between the teeth

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17
Q

What is the wedge shaped space called?

A

Interocclusal space and is usually 2-3mm between the incisors, 2mm between the premolars, and 3/4-1mm between the molars

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18
Q

What is postural position aka physiological rest position clincially used to determine?

A

The occlusal vertical dimension (OVD) in edentulous patients or in patients with severly warn dentition

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19
Q

What is the occlusal vertical dimension?

A

Distance measured between two points when the occluding members are in contact

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20
Q

Compare the vertical dimension at rest and the occlusal vertical dimension

A

The vertical dimension at rest (in the physiological rest position) is usually 2-3mm greater than the occlusal vertical dimension

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21
Q

What are the types of movement?

A

Rotation
Translation
Combination of both

22
Q

What are mandibular movements limited by?

A

Ligaments, the articular surfaces of the TMJ and the morphology and alignment of the teeth

23
Q

What is the outer range of movements called?

A

Border movements

24
Q

When do functional movements occur?

A

During functional activity of the mandible

25
Q

What are functional movements confined within?

A

Border movements

26
Q

When do functional movements begin and end?

A

In the maximum intercuspation position

27
Q

What are movement components of posselt’s envelope of movement?

A

Posterior opening border
Anterior opening border
Superior contact border
Functional movements

28
Q

What is envelope of motion a combination of?

A

Border movements in all 3 planes:
A. Sagittal
B. Horizontal
C. Frontal

29
Q

What happens during opening of the mouth in posterior opening border movement?

A

The condyles will move forward and down the articular eminence

30
Q

When is maximum opening reached?

A

When capsular ligaments prevent further movement

31
Q

What does anterior opening border movement represent?

A

The movement from maximum opening to maximum protrusion

32
Q

What ligaments is maximum protrusion determined by?

A

Stylomandibular ligaments

33
Q

Where are the condyles in anterior opening border movement?

A

Most anterior position

34
Q

Where does initial tooth contact occur in superior contact border movement?

A

Between the mesial inclines of the maxillary teeth and the distal inclines of the mandibular teeth

35
Q

Where does the mandible move in superior contact border movement?

A

From MIP to edge to edge

36
Q

What is the mandible movement determined by in superior contact border movement?

A

The lingual surfaces of the maxillary anterior teeth

37
Q

What does continued forward movement of the mandible, with the anterior teeth in contact result in?

A

Superior movement guided by the lingual surfaces of mandibular anterior teeth

38
Q

What are continued forward movement of the mandible guided by?

A

The posterior teeth until the mandible reaches maximum protrusion

39
Q

Where does the chewing stroke start at? then where does it go?

A

MIP and drops downwards and forwards to the position of desired opening

40
Q

What shape pattern is the border and functional movements in the horizontal plane?

A

Rhomboid shaped pattern

41
Q

What four movement components make up horizontal plane?

A
  1. Left lateral border
  2. Continued left lateral border with protrusion
  3. Right lateral border
  4. Continued right lateral border with protrusion and functional movements
42
Q

What does contraction of the right inferior lateral pterygoid cause?

A

The right condyle to move anteriorly and medially
The left interior lateral pterygoid relaxes
Left condyle: Rotating or working condyle
Right condyle: Orbiting or non-working or balancing

43
Q

What happens in the left lateral border with protrusion?

A

From the left lateral the left inferior lateral pterygoid starts to contract (the right stays contracted) and causes the left condyle to move anteriorly and to the right to maximum protrusion

44
Q

Where do functional movements occur?

A

Near MIP

45
Q

When are the outer range of movements greater?

A

In the early stages of mastication

46
Q

When are the outer range of movements smaller?

A

In the late stages of mastication

47
Q

What pattern of the border and functional movements of the frontal plane follow?

A

Shielf-shaped pattern

48
Q

What are the four distinct movement components of the frontal plane?

A
  1. Left lateral superior border
  2. Left lateral opening border
  3. Right lateral superior border
  4. Right lateral opening border
49
Q

What is the maximum lateral border position determined by?

A

The ligaments of the rotating condyle

50
Q

What is the superior surface of the envelope determined by?

A

The tooth contacts

51
Q

What are borers primarily determined by?

A

TMJ anatomy and the ligaments

52
Q
  1. What is the name of this envelope
  2. Define the position of all the numbers and letters
  3. What does it represent
A
  1. Posselt’s envelope
  3. CI
  4. MI
  5. Protrusion
    5-3. Maximum opening
    R. Postural position

D1 Spring - Occlusion & Fixed Pros. (17 decks)

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