TMJ

Question 1

TMJ

Answer 1

Temporomandibular Joint

Question 2

What kind of joint is the TMJ

Answer 2

Synovial and Ellipsoid

Question 3

Artificular surfaces are covered by

Answer 3

White Fibrocartilage

Question 4

What separates the joint into 2 separate cavities?

Answer 4

Articular Disc

Question 5

TMJ functions like two separate joints:

Answer 5

one above the disc and one below

Question 6

Which two movements occur

Answer 6

Rotation and Gliding or Translation

Question 7

Rotation occurs

Answer 7

in the Lower Cavity; from the beginning to midrange of movement

Question 8

Gliding occurs

Answer 8

in the Upper Cavity; is a sliding movement of the condyle and disc along the slope of the articular eminence. It occurs from midrange to full range of opening

Question 9

Capsule of TMJ

Answer 9

is thin and loose

Question 10

Synovial membrane lines the

Answer 10

capsule, above and below the disc, but does not cover the disc

Question 11

We have _ _ permanent teeth

Answer 11

32

Question 12

What are the 3 Ligaments of the TMJ TSS

Answer 12

Temporomandibular
Sphenomandibular
Stylomandibular

Question 13

Muscles of the TMJ are

Answer 13

Temporalis
Masseter
Lateral Pterygoid
Medial Pterygoid

Question 14

Actions of the TMJ are

Answer 14

Depression (opening)
Elevation (closing)
Protrusion
Retraction
Lateral Deviation of the Mandible

Question 15

Muscles that help depress the TMJ are

Answer 15

Lateral Pterygoid

Question 16

Muscles that help elevate the TMJ are

Answer 16

Temporalis, Masseter, Medial Pterygoid

Question 17

Muscles that help with Protrusion

Answer 17

Lateral and Medial Pterygoid Muscles

Question 18

Muscles that help with Retraction

Answer 18

Temporalis (posterior fibres)

Question 19

Muscles that help with Lateral Deviation of the Mandible

Answer 19

Medial and Lateral Pterygoids perform Lateral Deviation to Opposite Side

Question 20

TMJ is very vascular so avoid using

Answer 20

heat

Question 21

Lateral Pterygoid work throughout opening and closing. On opening it _____ while on closing it _________

Answer 21

On opening, initially the superior head of the LP is relaxed and the lower heads are contracted. On closing, the opposite occursl

Question 22

What is attached to the front and the back of the Disc

Answer 22

Front: Superior Head of the LP
Back: Posterior Connective Tissue

Question 23

Causes of Locking in Opening

Answer 23

Dislocation of TMJ due to hypermobility

Question 24

Causes of Locking in Closing

Answer 24

Condyle can rotate but cannot glide forward due to:
1. Muscle Spasm of Temporalis and Masseter
2. Disc has slid in front of the condyle and blocks the forward movement

Question 25

How do you Palpate the Muscles:

Answer 25

Masseter, Temporalis, Condyles of the Mandible, Mastoid Process

Question 26

How do you check TMJ Mobility

Answer 26

Fingers in Ears and how Palpate the Condyles and how

Question 27

What is the normal range of the TMJ depression (opening)

Answer 27

Two Knuckles Three Fingers 43mmT

Question 28

TMJ Arthrokinematics

Answer 28

Rest Position Rotation Functional Opening Translation Closure (half way to close)

Question 29

In the Rest Position

Answer 29

Joint in loose pack position Connective Tissue at Rest Superior and Inferior heads of LP at Rest

Question 30

During Rotation

Answer 30

Mid Opening Superior head of LP relaxed Inferior head of LP contract

Question 31

During Functional Opening

Answer 31

Superior and inferior heads of LP contract to guide disc and condyle shortly forward Posterior Connective Tissue in functional tightening

Question 32

During Translation

Answer 32

Full Opening Disc and condyle glide anterior and caudal guided by joint surface Superior and inferior heads of LP contract to guide disc and condyle fully forward Posterior Connective Tissue Tightens

Question 33

Closure (half way to close)

Answer 33

Condyle joint surface glides posteriorly Superior head of LP contract Inferior head of LP relax Posterior Connective Tissue returns to functional resting position