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Occlusion > Posslet Envelope of Movement > Flashcards

Posslet Envelope of Movement Flashcards

1
Q

Who created the envelope of movement in 1952?

A

Ulf Posslet

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2
Q

Where is posslet from?

A

Sweden

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3
Q

T/F: habitual movements do not generally coincide with border movements

A

True

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4
Q

Do habitual or border movements show greater variability in individuals?

A

habitual

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5
Q

T/F: The rest positions and intercuspal position generally differ from the retruded position of the mandible

A

True

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6
Q

describes the position of “best fit” between the upper and lower teeth. ◼It is the closest relationship of the mandible to the maxilla as this is where all the teeth fully interlock simultaneously.

A

Intercuspal position (ICP)/ MIP

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7
Q

What determines the Intercuspal position (ICP)?

A

Teeth and soft tissues

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8
Q

T/F: Though it may seem automatic that an individual goes from a rest position to ICP, this path of closure is actually a learnt behavior that is conditioned into short term memory

A

True

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9
Q

Does ICP give any info on TMJ?

A

No

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10
Q

Does ICP usually coincide with CR?

A

No

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11
Q

Usually during MIP, where are the condyles positioned in comparison to CR?

A

Anterior and inferior

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12
Q

Which position is used clinically for minimal restorations?

A

MIP

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13
Q

What are the 3 things mentioned that would cause the need for centric relation over MIP clinically?

A

Excessive wear, TMJ issues, and muscle pain

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14
Q

The 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 with the articular discs interposed.

A

Centric relation

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15
Q

Where are the condyles positioned in CR?

A

Most superior and anterior position

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16
Q

What determines the position in CR?

A

Condyles

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17
Q

Which position is referred to as the most orthopedically stable position?

A

CR

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18
Q

Which position is repeatable, reproducible, and recordable?

A

CR

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19
Q

Which portion of the articular disc are the condyles articulating with?

A

Intermediate portion (avascular portion)

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20
Q

The mandibular movements are limited by ligaments, the articular surfaces of the TMJ, and the morphology and alignment of the teeth; The outer range of movement is reproducible and called ______ movements

A

Border movements

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21
Q

_____ movements Occur during functional activity of the mandible, Are confined within the Border Movements, and Begin and end in the maximum intercuspation position

A

Functional movements

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22
Q

This pure rotational movement in the inferior cavity of TMJ is also referred to as ____ movement and the axis is referred to as _______ axis.

A

hinge movement; terminal hinge axis

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23
Q

This represents the movement from maximum opening to maximum protrusion; sagittal plane

A

Anterior opening border movement

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24
Q

Superior border movements are determined by the characteristics of

A

the occluding teeth.

25
Q

Throughout this entire movement tooth contact is present

A

Superior contact border movement

26
Q

The initial tooth contact of Superior contact border movement occurs between the _____ inclines of the maxillary teeth and the _____ inclines of the mandibular teeth.

A

mesial; distal

27
Q

The average distance between CR-MIP in 90% of the population is _____

A

1.25 +/- 1mm

28
Q

Where does the superior contact border movement begin?

A

Centric relation

29
Q

Normal contact in the superior contact border movement will result in what teeth initially contacting?

A

Posterior 2nd molar

30
Q

The mandible moves forward from MIP to edge to edge. This is determined by the ______ surfaces of the maxillary anterior teeth.

A

lingual surfaces

31
Q

From edge to edge the mandible can move further ______ for the width of the incisal edges.

A

horizontally

32
Q

Continued forward movement of the mandible, with the anterior teeth in contact, results in superior movement guided by the _______ of mandibular anterior teeth.

A

lingual surfaces

33
Q

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

A

posterior teeth

34
Q

habitual position 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. In this position there is an equilibrium between the forces acting on the mandible.

A

Postural position (PP)

35
Q

In the _____ position the muscles are not totally relaxed. There is a degree of electromyographic activity. This position is determined by the muscles and the forces of gravity. IT DOES NOT GIVE US ANY INFORMATION ABOUT THE CONDYLES OR THE TEETH

A

Postural position (PP)

36
Q

The condyles are usually _____ and ______ in postural position compared to their CR position.

A

anteriorly and inferiorly

37
Q

In this position, the teeth are apart and there is a wedge space between the teeth.

A

Postural position (PP)

38
Q

the teeth are apart and there is a wedge space between the teeth called _____

A

Interocclusal space

39
Q

What is the interocclusal space in PP between the incisors?

A

2-3mm

40
Q

What is the interocclusal space in PP between the premolars?

A

2mm

41
Q

What is the interocclusal space in PP between the molar?

A

3/4-1mm

42
Q

Postural position (PP) is located some ____ below the intercuspal position (ICP)

A

2-4 mm

43
Q

The postural position Clinically is used to determined the _______ in edentulous patients or in patients with severely worn dentition

A

Occlusal Vertical Dimension (OVD)

44
Q

The ______ is the distance measured between two points when the occluding members are in contact.

A

Occlusal Vertical Dimension

45
Q

The Vertical Dimension at Rest (in the physiological rest position) is usually ____ greater than the Occlusal Vertical Dimension.

A

2-3 mm

46
Q

The _____ is the space between the occlusal surfaces of the teeth when the mandible is at rest and the muscles in a state of minimum contraction

A

freeway space

47
Q

The chewing stroke starts at the MIP and drops ____ and _____ to the position of desired opening.

A

downwards and forwards

48
Q

The chewing stroke starts at the MIP and drops downwards and forwards to the position of desired opening. It returns in a straighter pathway slightly ____

A

posterior

49
Q

Which plane is the movement of the mandible in a rhomboid-shaped pattern?

A

Horizontal plane

50
Q

Contraction of the right inferior lateral pterygoid causes the right condyle to move ______ and ______

A

anteriorly and medially

51
Q

The outer range of movement is greater in the ____ stages of mastication.

A

early

52
Q

The outer range of movement is smaller in the ____ stages of mastication

A

late

53
Q

The further the mandible opens, the _____ the rhomboids of the horizontal plane gets

A

Smaller

54
Q

Which plane produces a shield-shaped pattern?

A

Frontal plane

55
Q

The _____ superior border from frontal plane: From MIP the mandible moves to the Left.The path is determined primarily by the morphology and interarch relationship of the teeth.The maximum lateral border position is determined by the ligaments of the rotating condyle.

A

Left lateral superior border

56
Q

The ________ is 3D; Combination of border movements in all 3 planes: a.sagittal, b.horizontal, c.frontal; differs from person to person but it has the same characteristic shape

A

Envelope of motion

57
Q

The ____ surface of the envelope is determined by the tooth contacts

A

superior surface

58
Q

Besides the superior surface of the envelope, The other borders are primarily determined by the _____ and ____

A

TMJ anatomy and the ligaments

Occlusion (13 decks)

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