TMJ

Question 1

Joint type

Answer 1

true synovial

gliding, hinging, slight rotation, sliding motion

Question 2

Articular surfaces are

Answer 2

fibrocartilage

well vascularized and innervated so can regenerate when injured

Question 3

Upper joint space is what

Answer 3

temporal bone to disc

glides forward and backward

Question 4

Lower joint space is what

Answer 4

disc to condyle of the mandible

angular joint surface motion

Question 5

Articular disc

Answer 5

biconcave

well vascularized and innervated except for the middle part! that is where it gets deformed

Question 6

Resting position of TMJ

Answer 6

jaw closed with 2-5mm between the teeth

Question 7

DOF

Answer 7

3
Dep/Elevation
Protrusion/Retrusion
Lateral deviation

Question 8

Depression involves what

Answer 8

anterior translation and glide

Question 9

Elevation involves what

Answer 9

Posterior and superior glide

Question 10

Protrusion and retrusion include what

Answer 10

condyle and disc translate together ant/post

Question 11

Lateral deviation includes what

Answer 11

axial rotation on the ipsilateral side

ant translation on contralateral side

Question 12

Chewing stroke

Answer 12

depression
lateral deviation (toward working side)
elevation
shear action = compress and shift food up and medial

Question 13

Temporomandibular ligament

Answer 13

two parts - oblique and horizontal
oblique - neck of condyle to articular condyle - resists downward/post motion
horizontal - lat condyle to post disc - resists post motion of condyle

Question 14

Stylomandibular ligament

Answer 14

styloid process to post ramus of mandible

limits protrusion

Question 15

Sphenomandibular ligament

Answer 15

spine of sphenoid to middle surface of ramus

resists excessive forward translation

Question 16

Mouth opening - early and late phases

Answer 16

early - spin at lower joint space

late - glide at upper joint space

Question 17

MM that do elevation

Answer 17

massater
temporalis
medial pterygoid

Question 18

MM that do protrusion

Answer 18

lat pterygoid
masseter
med pterygoid

Question 19

MM that do lateral deviation

Answer 19

ipsilateral temporalis
ipsilateral masseter
contralateral med/lat pterygoids

Question 20

MM that do retrusion

Answer 20

post temporalis
digastrics
stylohyoid
sphenomandibular ligament

Question 21

Buccal

Answer 21

surface next to cheek

Question 22

Lingual

Answer 22

next to tongue

Question 23

Labial

Answer 23

next to lips

Question 24

Mesial

Answer 24

front (center)

Question 25

Maximal intercuspation

Answer 25

ligual cusps of maxillary premolars and molars rest in deepest parts of occlusal sulci of mandibular premolars and molars

Question 26

Central occlusion

Answer 26

point of initial teeth contact on closing

ideally is maximal intercuspation

Question 27

Angles classes of occlusion - class 1

Answer 27

straight profile

Question 28

Angles classes of occlusion - class II

Answer 28

convex profile

protracted maxilla or retracted mandible

Question 29

Angles classes of occlusion - class III

Answer 29

concave profile

retracted maxilla

Question 30

Numbering system - permanent

Answer 30

L to R: 16 to 1 (top)

L to R: 17 to 32 (bottom)

Question 31

Numbering system - deciduous teeth

Answer 31

L to R: J - A (top)

L to R: K - T (bottom)

Question 32

Close packed

Answer 32

ant - max opening

post - max retrusion