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Occlusion Lecture > Posselt's Envelope > Flashcards

Posselt's Envelope Flashcards

(75 cards)

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1
Q

What are the three reference positions?

A

centric relation
maximum intercuspal position
postural position

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2
Q

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

A

centric relation

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3
Q

Does postural position give info about the condyles or teeth?

A

neither!

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4
Q

What are the benefits of CR? (3)

A

repeatable, reproducible, recordable

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5
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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6
Q

What is the pure rotational movement also called?

What is the axis called?

A

hinge movement

terminal hinge axis

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7
Q

condyle determined position

A

centric relation

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8
Q

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

A

MIP

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9
Q
A
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10
Q

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

A

Sagittal

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11
Q

Does MIP provide info about TMJ?

Does MIP coincide with CR in most people?

A

NO

NO…but it does in some

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12
Q

Does CR or MIP provide information about the TMJ?

A

CR

(MIP is tooth determined)

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13
Q

When the mandible is in CR the condyles can rotate around a ____ axis to an opening of 20-25 mm?

Where is this measured?

A

-horizontal
-central incisors

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14
Q

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

A

anterior and inferior

(or medial/lateral)

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15
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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16
Q

If patient needs minimal restorations…use what position?

A

MIP

(restoring one or few teeth)

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17
Q

Is MIP the same as centric occlusion?

A

NO!

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18
Q

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

A

postural position

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19
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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20
Q

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

A

Neither!!!

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21
Q

What is centric occlusion?

A

first contact in centric relation

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22
Q

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

A

no… there is a degree of electromyographic activity

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23
Q

What is postural position (PP) determined by?

A

muscles and the forces of gravity

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24
Q

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

A

anterior and inferior

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25
What is the interocclusal space between the incisors in postural position (PP)?
2-3 mm
26
What is the interocclusal space between the premolars in postural position (PP)?
2 mm
27
What is the interocclusal space between the molars in postural position (PP)?
3/4 - 1 mm
28
What is the wedge space between the teeth when in postural position (PP)?
interocclusal space
29
What is the ratio from anterior to posterior in postural position (PP)?
1:3
30
What is the postural position clinically used to determine?
occlusal vertical dimension (OVD) in edentulous patients or patients with severely worn dentition
31
distance measured between two points when the occluding members are in contact
occlusal vertical dimension (OVD)
32
The vertical dimension at rest (PRP) is usually ___ mm greater than the occlusal vertical dimension?
2-3 mm
33
What are the movements of the condyles?
rotation translation combo of both
34
What is the outer range of movement that is reproducible called?
border movements
35
What are the mandibular movements are limited by? (4)
ligaments, articular surfaces of TMJ, morphology and alignment of teeth
36
functional movements occur during functional activity of the ___
mandible
37
Functional movements begin and end in ____ position
MIP
38
Border and functional movements in the __ plane
sagittal
39
The functional movements of the mandible are confined within the...
border movements
40
What are the movement components of posselt's envelope of movment in the sagittal plane?
- posterior opening border - anterior opening border - superior contact border - functional movements
41
combination of border movements in 3 planes (sagittal, horizontal, frontal)
envelope of movement
42
when opening mouth. condyles will move forward and down the articular eminence
posterior opening border movement
43
when is the maximum opening reached in posterior opening border movement?
when **capsular ligaments** prevent further movement
44
movement from maximum opening to maximum protrusion (condyles are in the most anterior position)
anterior opening border movement
45
envelope of movement: combination of border movements in WHICH 3 planes ?
(sagittal, horizontal, frontal)
46
T/F: the envelope of movement varies from person to person but has the same characteristic shape
True
47
Maximum protrusion is determned by _____in anterior opening border movement?
**stylomandibular ligaments** (condyles in most *anterior* position)
48
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 until MI occurs)
superior contact border movement
49
What stops the superior contact border movement?
**maximum intercuspation occurs** (lateral component to the shift)
50
What is the average distance between CR-MIP in 90% of the population?
1.25 +- 1 mm
51
What is the superior contact border movement determined by?
the lingual surfaces of the maxillary anterior teeth (pathways inclines inferiorly)
52
Continued forward movement of the mandible is guided by the _____________ teeth until the mandible reaches maximum protrusion
posterior
53
functional movement: chewing stroke starts at ___and drops downward and forward to the position of desired opening...what is the difference when it returns?
MIP it returns in a straighter pathway and slightly posterior
54
What are the four movement components of the border and functional movements in the horizontal plane?
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
55
What is the left lateral border movement?
contraction of the right inferior lateral pterygoid causes the right condyle to move anteriorly and medially (left lateral pterygoid relaxes)
56
Name the movement-- left lateral and left inferior lateral pterygoid contract (right stays contracted) and causes LEFT condyle to move anteriorly and to the right to maximum protrusion
maximum protrusion (left lateral border movement with protrusion)
57
What are the working/non-working condyles in the left lateral border movement?
- left condyle: rotating/working - right condyle: orbiting/balancing/non-working
58
What is the right lateral border movement?
contraction of the left inferior lateral pterygoid causes the left condyle to move anteriorly and medially (right lateral pterygoid relaxes)
59
What position do functional movements occur near?
MIP
60
Functional movements occur within the outer ranger of the ____
border movements
61
The outer range of movement is ________ in the late stages of mastication
smaller
62
The outer range of movement is ________ in the early stages of mastication
greater
63
What are the border/functional movements in the frontal plane?
- left lateral superior border - left lateral opening border - right lateral superior border - right lateral opening border and functional movements
64
What is the shape of the sagittal and horizontal planes movements?
rhomboid (square)
65
What is the shape of the frontal plane movements
shield
66
What is the left lateral superior border movement?
from MIP the mandible moves to the left
67
What is the left lateral superior border movement determined by: The path is determined by: The maximum lateral border position is determined by:
- by the morphology and interarch relationship of the teeth - ligaments of the rotating condyle
68
On the left lateral opening border as the maximum opening approaches what happens to the ligaments?
they tighten and produce a medial shift
69
left lateral opening border is a ___ path as max opening approaches, ligaments tighten and produce a __ shift
--lateral convex --medial shift
70
What is the right lateral superior border?
from MIP the mandible moves to the right
71
What is the left lateral superior border movement determined by?
- by the morphology and interarch relationship of the teeth - ligaments of the rotating condyle
72
What is the superior surface of the envelope of motion determined by?
tooth contacts
73
- Posselt's Envelope 1 - CR 2 - MIP 3 to 5 - max opening protrusion r - postural position III= max opening
74
What position is the condyle in here?
Centric Relation
75
if mand opening continues beyond 20-25mm what occurs?
translational movement

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