Jaw Relation

Question 1

which JR is the most critical?

Answer 1

Vertical JR

Question 2

eccentric relation?

Answer 2

any relation other than centric is eccentric

Question 3

Vertical JR

Answer 3

length of the face as determined by the separation of jaws

Question 4

what is jaw relation?

Answer 4

JR is the relation of maxillat to mandible

Question 5

what is camper’s line?

Answer 5

Ala-tragus line (ala of nose and tragus of ear)

Question 6

Freeway space

Answer 6

• space b/w teeth at rest
  -VDR-VDO= freeway space
  -2-4mm

Question 7

in which plane is vertical JR recorded

Answer 7

frontal plane

Question 8

Why is JR recorded?

Answer 8

to measure extensibility + movements permitted by TMJ w/o harm

Question 9

types of VJR

Answer 9

1.Vertical dimension at rest
2. ……………………………..at occlusion

Question 10

Define orientation JR

Answer 10

mandi in most post. position, rotate in sagittal plane around an imaginary transverse axis passing through or near condyles

Question 11

overbite?

Answer 11

vertical overlap b/w max nd mandi incisors
1mm

Question 12

Horizontal JR

Answer 12

relation of max nd mand in horizontal plane

Question 13

increased vertical JR causes

Answer 13

1. cheek biting
2. increased trauma to denture bearing areas
3. increased lower facial height
4. stretches facial muscles

Question 14

Plane of occlusal rim should be ___________________ ( in relation to Maxilla

Answer 14

parallel to plane of maxilla

Question 15

How do you verify max. rim

Answer 15

using a fox plane

Question 16

VDO?

Answer 16

length of face when teeth/ occlusion rims are in contact/ mandi in centric relation

Question 17

what is the difference between kinematic face bow & arbitary face bow

Answer 17

arbitary face bow: with an earpiece
kinematic: has condylar rods

Question 18

what does orientation jr record?

Answer 18

angulation of max in relation to the base of skull

Question 19

5?

Answer 19

condylar rods: helps locate TMJ

Question 20

HJR is in which direction

Answer 20

anteroposterior

Question 21

how to record orientation jr?

Answer 21

face bow

Question 22

Types of JR

Answer 22

1. orientation
   2.vertical
2. horizontal

Question 23

types of HJR?

Answer 23

1. centric
2. eccentric

Question 24

overjet?

Answer 24

horizontal distance b/w max nd mandi incisiors
1-2mm

Question 25

what does bite fork represent

Answer 25

mandible

Question 26

which jr is recorded first?

Answer 26

orientation

Question 27

which type if relation is learnable, repeatable, nd recordable?

Answer 27

centric relation

Question 28

3?

Answer 28

locking unit: locks 1 & 2

Question 29

centric relation?

Answer 29

when mandi is in its most post position, it is called as centric relation

Question 30

How do you determine the plane of maxilla

Answer 30

by inter-pupillary line + camper’s line

Question 31

1?

Answer 31

u shaped frame: records the plane of the cranium

Question 32

2?

Answer 32

bite fork: acts as the mandible

Question 33

wrong HJR causes?

Answer 33

high points

Question 34

VDR

Answer 34

length of face when mandi at rest
- ask pt to swallow or wet lips nd mandi places itself in VDR position

Question 35

angular chelitis is caused by_____ VR?

Answer 35

decreased (angular chelitis is the folding of corner of mouth)

Question 36

what does the u shaped frame in a facebow function as

Answer 36

represents the plane of cranium

Question 37

4?

Answer 37

orbital pointer: ant. reference point: infraorbital notch

Question 38

loss of lip fullness is caused by _______ of VJR

Answer 38

decrease in

Question 39

parts of a face bow

Answer 39

1. u shaped frame
2. condylar rods
3. bite fork
4. orbital pointer
5. locking device

Question 40

Frankfurt horizontal plane

Answer 40

from lower plane of orbit to tragus

Question 41

angle formed between camper’s line and frankfurt plane?

Answer 41

camper’s line forms a 15-20 degrees angle with frankfurst plane