Posselt's Envelope of Movement

Question 1

REFERENCE POSITIONS (3)

Answer 1

• CENTRIC RELATION
• MAXIMUM INTERCUSPAL POSITION
• POSTURAL POSITION

Question 2

CENTRIC RELATION

Answer 2

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

Question 3

CENTRIC RELATION (CR)
--- DETERMINED POSITION

Answer 3

CONDYLE

Question 4

CR is (3)

Answer 4

repeatable
reproducible
recordable

Question 5

when the mandible is in CR, the condyles can rotate around a horizontal axis up to an opening of — measured at the central incisors

Answer 5

20-25 mm

Question 6

if the opening of the mandible continues beyond 20-25 mm, then — of the mandible occurs

Answer 6

translation

Question 7

pure rotational movement is also referred to as — movement and the axis is referred to as —

Answer 7

hinge movement

terminal hinge axis

Question 8

MAXIMAL INTERCUSPAL POSITION
OR MAXIMUM INTERCUSPATION
— determined position

Answer 8

tooth

Question 9

MAXIMAL INTERCUSPAL POSITION
OR MAXIMUM INTERCUSPATION
does not provide any info about the

Answer 9

TMJ

Question 10

in most people, MIP does not coincide with

Answer 10

CR

Question 11

in MUP The condole-disc assembly is

Answer 11

anterior inferior and/or medial or lateral or a combo of the above compared to the position in CR

Question 12

usually, the condyle disc assemblies are

Answer 12

anterior and inferior

Question 13

when is MI used

Answer 13

clinically if the patient needs minimal restorations

Question 14

position restorations are made in

Answer 14

MI

Question 15

postural position

Answer 15

the habitual postural of the mandible when the patient is resting comfortably in the upright position and the condyles are in the neutral unstrained position in the glenoid fossa

Question 16

in PP< there is an equilibrium between the

Answer 16

forces acting on the mandible

Question 17

in the PP, the muscles are not totally

Answer 17

relaxed

there is a degree of electromyographic activity

Question 18

PP is determined by the

Answer 18

muscles and the forces of gravity

Question 19

PP does not give us information about the

Answer 19

condyles or the teeth

Question 20

in PP, the condyles are usually

Answer 20

anterior and inferior compared to their CR position

Question 21

PP can be – and is — for the patient

Answer 21

sustained

comfortable

Question 22

in PP, the teeth are

Answer 22

apart and there is a wedge space between the teeth

Question 23

the wedge shaped space is called the

Answer 23

interocclusal space

Question 24

interocclusal space is usually –mm between the incisors, –mm between the premolar, and –mm between the molars

Answer 24

2-3
2
3/4-1

Question 25

there is a -:- ratio from anterior to posterior

Answer 25

1:3

Question 26

PP is clinically used to determine the

Answer 26

OVD in edentulous patients or in patients with severely worn dentition

Question 27

the OVD is the distance measure between two points when the

Answer 27

occluding members are in contact

Question 28

the vertical dimension at rest (in PRP) is usually --- greater than the occlusal vertical dimension

Answer 28

2-3mm

Question 29

type of movement (3)

Answer 29

rrotation translation combo

Question 30

the mandibular movements are limited by the (3)

Answer 30

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

Question 31

the outer range of movement is reproducible and called

Answer 31

border movements

Question 32

when do functional movements occur

Answer 32

during functional activity of the mandible

Question 33

functional movements are confused within the

Answer 33

border movements

Question 34

functional movements begin and end in the

Answer 34

MI position

Question 35

BORDER AND FUNCTIONAL MOVEMENTS | IN THE SAGITAL PLANE

Answer 35

Posselt's Envelope of Movemet

Question 36

movement components in sagittal plane (4)

Answer 36

posterior opening border anterior opening border superior contact border functional movements

Question 37

envelope of motion is --

Answer 37

3D

Question 38

envelope of movement is a combo of borer movements in all three planes:

Answer 38

sagital horizontal frontal

Question 39

the envelope differs from person to person but it has the same

Answer 39

characteristic shape

Question 40

during opening of the mouth the condyles will move

Answer 40

forward and down the articular eminence

Question 41

maximum opening is reached when

Answer 41

capsular ligaments prevent further movement

Question 42

anterior opening border movement represents the

Answer 42

movement from max opening to max protrusion

Question 43

the max protrusion is determined partly by the

Answer 43

sytlomandibular ligaments | the condyles are in the most anterior position

Question 44

superior contact border movement: | the initial tooth contact occurs between the -- inclines of the max teeth and the -- inclines of the mand teeth

Answer 44

mesial | distal

Question 45

superior contact border movement: | the mandible will then move

Answer 45

superioanteriorly (shift) until the max intercuspation occurs. there may also be a lateral component to the shift

Question 46

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

Answer 46

1.25 +/- 1 mm

Question 47

superior contact border movement: | the mandible moves forward from MIP to edge to edge. this is determined by the

Answer 47

lingual surface of the max anterior teeth. the pathway inclines inferiorly

Question 48

superior contact border movement: | from edge to edge the mandible can move

Answer 48

further horizontally for the width of the incisal edges

Question 49

superior contact border movement: | continued forward movement of the mandible. with the anterior teeth in contact, results in

Answer 49

superior movement guided by the lingual surfaces of mandibular anterior teeth

Question 50

superior contact border movement: | continued forward movement of the mandible is guided by the

Answer 50

posterior teeth until the mandible reaches max protrusion

Question 51

the chewing stroke

Answer 51

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

Question 52

the chewing stroke returns in a

Answer 52

straighter pathway slightly posterior

Question 53

BORDER AND FUNCTIONAL MOVEMENTS IN THE HORIZONTAL PLANE: pattern

Answer 53

rhomboid shaped

Question 54

BORDER AND FUNCTIONAL MOVEMENTS IN THE HORIZONTAL PLANE: four movement components

Answer 54

left lateral border continued left lateral border with protrusion right lateral border continued right lateral border with protrusion and functional movements

Question 55

contraction of the right inferior lateral pterygoid causes the right condyle to move

Answer 55

anteriorly and medially | the left inferior lateral pterygoid relaxes

Question 56

left lateral border movement: | left condyle

Answer 56

rotating or working condyle

Question 57

left lateral border movement: | right condyle

Answer 57

orbiting or non working

Question 58

left lateral border with protrusion: from the left lateral the left inferior lateral pterygoid starts to contract (right stays contracted) and causes the left condyle to move

Answer 58

anteriorly and to the right to max protrusion

Question 59

right lateral border movement:

Answer 59

the exact opposite to the left lateral border movement occurs

Question 60

right lateral border with protrusion:

Answer 60

the exact opposite to the left lateral border with protrusion occurs

Question 61

functional movements occur near

Answer 61

MIP

Question 62

functional movements: | the outer range of movement is greater in

Answer 62

early stages of mastication

Question 63

functional movements: | the outer range of movement is smaller in the

Answer 63

late stages of mastication

Question 64

BORDER AND FUNCTIONAL MOVEMENTS IN THE FRONTAL PLANE: pattern

Answer 64

shield shaped

Question 65

BORDER AND FUNCTIONAL MOVEMENTS IN THE FRONTAL PLANE: four distinct movement components

Answer 65

left lateral superior border left lateral opening border right lateral superior border right lateral opening border and functional movements

Question 66

left lateral superior border: | from MIP the mandible moves to the

Answer 66

left

Question 67

left lateral superior border: | the path is determined primarily bu the

Answer 67

morphology and inter arch relationship of the teeth

Question 68

left lateral superior border: | the max lateral border position is determined by the

Answer 68

ligaments of the rotating condyle

Question 69

left lateral opening border: | path

Answer 69

lateral convex path

Question 70

left lateral opening border: | as maximum opening approaches, ligaments

Answer 70

tighten and produce a medial shift

Question 71

RIGHT LATERAL SUPERIOR BORDER

Answer 71

similar to the left lateral superior border

Question 72

RIGHT LATERAL | OPENING BORDER

Answer 72

similar to the left lateral opening border

Question 73

FUNCTIONAL MOVEMENTS: | occur near

Answer 73

MIP

Question 74

FUNCTIONAL MOVEMENTS: | occur within the

Answer 74

outer range of the border movements

Question 75

ENVELOPE OF MOTION: | the superior surface of the envelope is determined by the

Answer 75

tooth contacts

Question 76

ENVELOPE OF MOTION: | the other borders are primarily determined by the

Answer 76

TMJ anatomy and the ligaments