TMJ Lecture

Question 1

How much freeway space is normal between your teeth

Answer 1

2-4mm

your teeth should not be touching when resting

Question 2

Bruxism

Answer 2

Grinding teeth

Question 3

Occlusion

Answer 3

Functional relationship between maxillary and mandibular teeth

Question 4

What is the normal amount of overbite

Answer 4

The maxillary teeth should cover approximately 1/3 of the mandibular teeth

Question 5

what is overjet?

Answer 5

How far infront the maxillary teeth are from the mandibular teeth

Question 6

What is crossbite?

Answer 6

Mandibular teeth and mandibular teeth are not in line with central incisors

Question 7

How do you name crossbite, which side?

Answer 7

Judged by the side that the mandible is shifted towards

Question 8

What movement happens at the inferior cavity of the disc

Answer 8

rotation of the condyle occurs

Question 9

what movement happens at the superior cavity of the disc

Answer 9

Translation

Question 10

Which part of the disc is vascular/neural, which is avascular/aneural?

Answer 10

Anterior and posterior are vascular and neural

middle portion is not

Question 11

Describe the shape of the TMJ disc

Answer 11

biconcave

Question 12

Which head of the lateral pterygoid attaches to the disc

Answer 12

superior head

Question 13

what structure is the pain generator in excessive anterior translation

Answer 13

retrodiscal laminae

Question 14

The superior retrodiscal laminae does what?

the inferior does what?

Answer 14

superior- allows anterior translation

inferior- prevents excessive anterior translation

Question 15

What muscles do elevation of the TMJ

Answer 15

Masseter

Temporalis

Medial pterygoid

Superior fiber of laterel pterygoid

Question 16

What muscle helps stabilize the TMJ disc

Answer 16

superior fiber of lateral pterygoid

Question 17

What muscles help with depression

Answer 17

Inferior lateral ptery

suprahyoids/infrahyoids

Question 18

What muscles help with protrusion

Answer 18

Superficial masseter

medial pterygoid

lateral pterygoid

Question 19

What is the only action that the lateral pterygoid does not do

Answer 19

retrusion

Question 20

what muscles do retrustion

Answer 20

deep fibers of masseter

temporalis

suprahyoids(digastric)

Question 21

What muscles do lateral excursion

Answer 21

contralateral medial and Lateral pterygoid

ipsilateral temoralis and masseter

Question 22

What muscles stabilize the hyoid bone

Answer 22

infrahyoids

Question 23

what muscles are responsible for depression and retrusion of mandibles

Answer 23

suprahyoids

Question 24

generally muscles that _____ the jaw are tight

muscles that ______ the jaw are weak and inhibited

Answer 24

close

open

Question 25

What nerve innervates the TMJ area

Answer 25

trigeminal V3

Question 26

What is the resting position of the disc on the condyle

Answer 26

should sit slightly anterior to the condlye

Question 27

_______ occurs in the first 20-25mm of motion (early phase)

Answer 27

rotation

Question 28

first _______ occurs then __________ during TMJ opening

Answer 28

rotation, translation

Question 29

when the anterior mandible moves posteriorly and inferiorly (your jaw opening), the condyle moves...

Answer 29

anteriorly and inferiorly

Question 30

when your jaw closes, the anterior mandible moves anteriorly and superiorly the condyle moves...

Answer 30

posteriorly and superiorly

Question 31

during lateral deviation, ipsilateral condyle ________ the contralateral condyle ________-

Answer 31

ipsilateral rotates Contralateral translation

Question 32

the mandible slides _________ during protrusion and _________ during retrusion

Answer 32

slightly downward slightly upward

Question 33

what is normal TMJ opening what is functional TMJ opening

Answer 33

normal 40-60 functional: 35

Question 34

causes of tmj dysfunction

Answer 34

grinding/clenching gum chewing oral fixation (chewing on things) excessive yapping

Question 35

jaw pain is correlated with _____ tone

Answer 35

cervical muscle tone

Question 36

What happens during Anterior Disc DIsplacement with reduction ADDwR

Answer 36

Condyle jumps over the disc causing a click during opening and closing disc is too far forward

Question 37

With ADDwR, the disc can displace anterior again with closing, causing a click, due to ________-

Answer 37

excessive contraction of lateral pterygoid

Question 38

Subjective: "I used to pop and click" Reduced ROM

Answer 38

Anterior disc displacement without reduction ADDwoR

Question 39

Anterior disc displacement without reduction ADDwoR

Answer 39

reduced ROM no popping disc stays in front of the condyle the whole time

Question 40

ADDwoR limited opening vs no limitation in opening

Answer 40

Limited opening- disc blocking the condylar head no limitation: disc is completely displaced anteriorly

Question 41

Associated conditions with TMJ Dysfunction

Answer 41

Major 2: Headache, neckpain vertigo, ear issues, neuralgia, chronic pain

Question 42

motion analysis: C shape opening deviates to the _________--

Answer 42

side of restriction

Question 43

motion analysis: : S shape opening

Answer 43

lack of motor control

Question 44

motion analysis: Deflection w/ opening

Answer 44

anterior disc displacement (typically towards side of displaced disc)

Question 45

cotton roll test bite object on painful side molars Pain increased: Pain decreased:

Answer 45

Pain increased: muscular origin Pain decreased: joint related- to confirm test on non-painful side, this should result in pain

Question 46

Centric relation provocation test

Answer 46

Grasp lower mandible w/ index and ring finger externally w/ thumb ontop of the mandibular teeth keep jaw slightly open and push anterior-superior (basically just mashing the disc with the mandible) positive if pain recreated anterior to tragus indicates disc issue