Dent. Anatmy: TMJ

Question 1

TMJ is a

True / False: loading joint
True/ False: synovial joint

Answer 1

Both statements are True

Question 2

Inferior compartment of TMJ

Answer 2

rotation, superior compartment of TMJ= translation

> 25 mm opening

Question 3

What part of the condyle is involved in translation?

Answer 3

anterior superior

Question 4

What ligament restricts protrusive movement?

Answer 4

Stylomandibular ligament

Question 5

When ligament gets taut in full mouth what happens?

Answer 5

condyles move forward

Question 6

When yawning, which ligament tightens up so that the condyle stays in fossa & prevents retrusion?

Answer 6

Temporomandibular Ligament

Question 7

TM Ligament attaches to?

Answer 7

zygoma & prevent excessive retrusion

Question 8

What ligament is connected the lingual of the mandible?

Answer 8

Sphenomandibular Ligament

Question 9

Origin & Insertion of sphenomandibular ligament:

Answer 9

Spine of the sphenoid & lingula of the mandible

- prevents excessive opening

Question 10

Origin & Insertion of pterygomandibular raphe?

Answer 10

Hamulus of the pterygoid plate & mylohyoid line

Question 11

Origin & insertion of temporomandibular ligament?

Answer 11

Articular eminence/posterior zygomatic arch & neck of condyle

Question 12

Collateral (Discal) ligaments used during lateral movements & keep articulator cartilage on the ?

Answer 12

condyle head

Question 13

Disc of TMJ is what to the condyle?

Answer 13

attached laterally

Question 14

what type of tissue covers the condylar surface of a 10yr old?

Answer 14

Dense fibrous connective tissue

Question 15

What covers the articulating surface of the TMJ?

Answer 15

Fibrocartilage

Question 16

Articulating surface of TMJ in older person is covered in ?

Answer 16

Fibrous connective tissue containing chondrocytes

Question 17

Where is the phagocyte located in the TMJ?

Answer 17

Synovial membrane

Question 18

What is the direct source of nutrients to the articulating surfaces?

Answer 18

Diffusion from synovial fluid

Question 19

What type of connective tissue is in the middle portion of the retrodiscal pad?

Answer 19

Loose CT with blood supply

Question 20

Patient is anesthetized & pain at the TMJ is gone, what nerve is was anesthetized?

Answer 20

Auriculotemporal N (CN V3)

Question 21

TMJ innervation is from?

Answer 21

Auriculotemporal N

Question 22

Which criteria determines the progressive shift of nonworking codyle?

Answer 22

Medial wall anatomy of the glenoid fossa

Question 23

Cusp tip of tooth #6 & 27 touch on laterotrusive movement, where is the condyle on the non-working side?

Answer 23

Medial wall of glenoid fossa

Question 24

Laterotrusive rotates while mediotrusive side translates ___________

Answer 24

translates forward and opens a bit

Question 25

When restoring a lingual cusp of man 2nd Molar, which movement is most likely to cause interference?

Answer 25

Mediotrusive

Question 26

On your articulator, altering horizontal condylar guidance will affect all of the following except?

Answer 26

Laterotrusive

Question 27

Patient with a class III crossbite does retrusion. What mandibular teeth will the maxillary lateral incisor contact?

Answer 27

Canine & lateral incisor

Question 28

In class II occlusion during protrusive movement, which teeth does the mandibular canine occlude with?

Answer 28

Max man canine & 1st PM

Question 29

#13 lingual cusp broke, what movement caused it & with what tooth did it break against?

Answer 29

MF cusp of #19 in a right lateral non-working side movement

Question 30

Pt's condyle had ankyloses so can only do the hinge motion, no translation. What is the max opening?

Answer 30

30 mm

Question 31

When swallowing, teeth should be in ?

Answer 31

ICP

Question 32

Centric relation

Answer 32

most repeatable postion

Question 33

Rest position

Answer 33

by musculature

Question 34

Space between teeth in the rest postion is ?

Answer 34

2-4 mm

Question 35

What is not seen in Posselt's envelope?

Answer 35

Rest position

Question 36

Difference between most anterior point and most inferior ?

Answer 36

anterior point = protrusion | most inferior = maximum opening