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Occlusion Lecture > Posselt's Envelope > Flashcards

Posselt's Envelope Flashcards

1
Q

What are the three reference positions?

A

centric relation
maximum intercuspal position
postural position

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2
Q

What is CR?

A

condyles of the mandible are in the most superior and anterior position in the articular fossae, resting against the posterior slops of the articular eminences with the articular discs interposed

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3
Q

What are the benefits of CR?

A

repeatable, reproducible, recordable

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4
Q

When the mandible is in CR the condyles can rotate around a horizontal axis to an opening of how many mm?

A

20-15 mm (measured at central incisors)

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5
Q

What is the pure rotational movement also called?

A

hinge movement

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6
Q

What is MIP?

A

the maxillary and mandibular teeth make maximum surface contact with each other (mandible is elevated as superiorly as possible)

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7
Q

Does CR or MIP provide information about the TMJ?

A

CR

(MIP is tooth determined)

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8
Q

What is the usual condyle-disc assembly when in MIP?

A

anterior and inferior

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9
Q

What is the position that restorations (amalgam, composite, single crown, short-span fixed partial denture) are made in?

A

MIP

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10
Q

Is MIP the same as centric occlusion?

A

NO!

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11
Q

What is postural position (PP)?

A

habitual posture 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

What reference position (CR, MIP, PP) has an equilibrium between the forces acting on the mandible?

A

PP (postural position)

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13
Q

Does postural position provide info on condyle position or teeth position?

A

Neither!!!

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14
Q

What is centric occlusion?

A

first contact in centric relation

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15
Q

Are the muscles completely relaxed when in postural position (PP)?

A

no… there is a degree of electromyographic activity

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16
Q

What is postural position (PP) determined by?

A

muscles and gravity

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17
Q

Where are the condyles usually in postural position (PP) when compared to CR?

A

anterior and inferior

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18
Q

What is the interocclusal space between the incisors in postural position (PP)?

A

2-3 mm

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19
Q

What is the interocclusal space between the premolars in postural position (PP)?

A

2 mm

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20
Q

What is the interocclusal space between the molars in postural position (PP)?

A

3/4 - 1 mm

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21
Q

What is the wedge space between the teeth when in postural position (PP)?

A

interocclusal space

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22
Q

What is the ratio from anterior to posterior in postural position (PP)?

A

1:3

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23
Q

What is the postural position clinically used to determine?

A

occlusal vertical dimension (OVD) in edentulous patients

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24
Q

What is the occlusal vertical dimension?

A

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

25
Q

The vertical dimension at rest (PRP) is usually ___ mm greater than the occlusal vertical dimension?

A

2-3 mm

26
Q

What are the movements of the condyles?

A

rotation
translation
both

27
Q

What is the outer range of movement that is reproducible called?

A

border movements

28
Q

What are the border movements limited by?

A

ligaments, articualr surfaces of TMJ, morphology and alignment of teeth

29
Q

The functional movements of the mandible are confined within the…

A

border movements

30
Q

What are the movement components of posselt’s envelope of movment in the sagittal plane?

A
  • posterior opening border
  • anterior opening border
  • superior opening border
  • functional movements
31
Q

What is the envelope of movement?

A

combination of border movements in 3 planes (sagittal, horizontal, frontal)

32
Q

What is the posterior opening border movement?

A

when opening condyles will move forward and down the articular eminence

33
Q

What is the maximum opening reached in posterior opening border movement?

A

capsular ligaments prevent further movement

34
Q

What is the anterior opening border movement?

A

movement from maximum opening to maximum protrusion (condyles are in the most anterior position)

35
Q

What is the maximum opening reached in anterior opening border movement?

A

stylomandibular ligaments

36
Q

What is the superior contact border movement?

A

inital tooth contact occurs between the mesial inclines of the maxillary teeth and the distal inclines of the mandibular teeth

(mandible will move superio-anteriorly)

37
Q

What stops the superior contact border movement?

A

maximum intercuspation occurs (lateral component to the shift)

38
Q

What is the average distance between CR-MIP in 90% of the population?

A

1.25 +- 1 mm

39
Q

What is the superior contact border movement determined by?

A

the lingual surfaces of the maxillary anterior teeth

40
Q

Continued forward movement of the mandible is guided by the _____________ teeth until the mandible reaches maximum protrusion

A

posterior

41
Q

What is the functional movement generally?

A

chewing stroke starts at MIP and drops downward and forward to the position of desired opening

42
Q

What are the four movement components of the border and functional movements in the 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
43
Q

What is the left lateral border movement?

A

contraction of the right inferior lateral pterygoid causes the right condyle to move anteriorly and medially (left lateral pterygoid relaxes)

44
Q

What are the working/non-working condyles in the left lateral border movement?

A
  • left condyle: rotating/working
  • right condyle: orbiting/balancing/non-working
45
Q

What is the right lateral border movement?

A

contraction of the left inferior lateral pterygoid causes the left condyle to move anteriorly and medially (right lateral pterygoid relaxes)

46
Q

What position do functional movements occur near?

A

MIP

47
Q

The outer range of movement is ________ in the late stages of mastication

A

smaller

48
Q

The outer range of movement is ________ in the early stages of mastication

A

greater

49
Q

What are the border/functional movements in the frontal plane?

A
  • left lateral superior border
  • left lateral opening border
  • right lateral superior border
  • right lateral opening border and functional movements
50
Q

What is the shape of the sagittal and horizontal planes movements?

A

rhomboid (square)

51
Q

What is the shape of the frontal plane movements

A

shield

52
Q

What is the left lateral superior border movement?

A

from MIP the mandible moves to the left

53
Q

What is the left lateral superior border movement determined by?

A
  • by the morphology and interarch relationship of the teeth
  • ligaments of the rotating condyle
54
Q

On the left lateral opening border as the maximum opening approaches what happens to the ligaments?

A

they tighten and produce a medial shift

55
Q

What is the right lateral superior border?

A

from MIP the mandible moves to the right

56
Q

What is the left lateral superior border movement determined by?

A
  • by the morphology and interarch relationship of the teeth
  • ligaments of the rotating condyle
57
Q

What is the superior surface of the envelope of motion determined by?

A

tooth contacts

58
Q
A
  • Posselt’s Envelope
    1 - CR
    2 - MIP
    3 - protrusion
    from 3 to 5 - max opening
    r - postural position

Occlusion Lecture (17 decks)

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