Complete Prosthetics

Question 1

When do you complete the jaw registration record?

Answer 1

after primary and secondary impressions

Question 2

What is jaw relation record?

Answer 2

assessing how the patient is occluding, where teeth should go and how the arches relate to each other

Question 3

What is centric relation?

Answer 3

maxillo-mandibular relation with muscles relaxed and condyles in the most anterior-superior position in the glenoid fossa

Question 4

Are teeth contacting in centric relation?

Answer 4

no

Question 5

Why do we use centric relation?

Answer 5

it is the most reproducible position as it is a position of musculoskeletal stability

Question 6

For dentures do we want a difference between the retruded contact position an the position of maximum intercuspation?

Answer 6

no, we don’t want the teeth to slide into maximum intercuspation

Question 7

What do you use to record the jaw registration?

Answer 7

wax rims

Question 8

What is the first thing you check when you get the wax back from the lab?

Answer 8

that it is smooth with no lumps or sharpness and that the heels of the cast do not touch or interfere with the wax rims

Question 9

What type of occlusion do we want for complete dentures?

Answer 9

balanced occlusion

Question 10

What is balanced occlusion?

Answer 10

all teeth in contact at the same time

Question 11

How can you check stability of the complete denture wax rims?

Answer 11

press on one side and see if it lifts on the other side

Question 12

What is jaw relation?

Answer 12

relationship of the maxilla to the mandible

Question 13

Why is it important to make a record of the jaw relation?

Answer 13

there are no teeth so you can’t assess the vertical height otherwise

Question 14

What can happen if the teeth end up too high in the denture? (the vertical height is increased)

Answer 14

difficulty in function and swallowing, discomfort, elongated face

Question 15

What can happen if the teeth end up too low in the denture? (the vertical height is decreased)

Answer 15

increased cheek biting, increased chance of angular cheilitis, TMJ pain, mandibular protrusion

Question 16

Should you look at the mandibular or maxillary wax rim first?

Answer 16

maxillary

Question 17

What is the first thing you should look at when assessing a wax rim?

Answer 17

the lip support/labial fullness

Question 18

Why is it important to check the lip support of the wax rims?

Answer 18

to ensure the teeth will be positioned in the neutral zone

Question 19

What is the neutral zone?

Answer 19

the space between the intra and extra oral muscles where the teeth normally sit

Question 20

What can happen if the teeth are positioned outside of the neutral zone?

Answer 20

the lips or tongue will push against the teeth and the denture will be unstable

Question 21

What is the second thing you should look at when assessing a wax rim?

Answer 21

incisal show

Question 22

What should the incisal show be for the maxillary wax rim?

Answer 22

2mm below the relaxed upper lip and parallel to the interpupillary line

Question 23

What lines should you mark on a maxillary wax rim?

Answer 23

centre line and canines

Question 24

Where do you draw the lines to mark the canines on a maxillary wax rim?

Answer 24

either side of the nose

Question 25

What planes should be parallel when using a foxs plane?

Answer 25

occlusal plane, interpupillary line, ala tragal line

Question 26

What should the incisal show be for the mandibular wax rim?

Answer 26

at or below the level of the lower lip and angle of mouth

Question 27

What is vertical dimension?

Answer 27

the amount of separation between the maxilla and mandible

Question 28

What does RVD stand for?

Answer 28

resting vertical dimension

Question 29

What does OVD stand for?

Answer 29

occluding vertical dimension

Question 30

What is freeway space?

Answer 30

the difference between RVD and OVD

Question 31

What is the average FWS (Freeway Space)?

Answer 31

2-4mm

Question 32

What tool do we use to measure the vertical dimension?

Answer 32

willis bite gauge

Question 33

How do we measure the vertical dimension?

Answer 33

with the maxillary wax rim in the patient’s mouth, take four measurements and take the average as the RVD and minus 2-4mm to get the OVD

Question 34

What are the four measurements we take to get the average vertical dimension?

Answer 34

relaxed, lick the lips, say ‘m’, swallow

Question 35

Why is it important to record the OVD?

Answer 35

that will give the vertical dimension when the wax rims should be touching and allows you to adjust the height of them to reflect that

Question 36

Why is it important to record the centric relation of the wax rims once the OVD is accurate?

Answer 36

the mandible tends to protrude if there are no teeth and centric relation is the most reproducible and stable position

Question 37

How can you record centric relation?

Answer 37

make a couple notches in the wax rims and use silicone to record an impression of how the wax rims fit together in centric relation

Question 38

Where are the relief areas of the maxilla?

Answer 38

labial frenum, buccal frenum, incisive papilla

Question 39

Where are the support areas of the maxilla?

Answer 39

residual ridge, palate, maxillary tuberosity, rugae

Question 40

Where are the relief areas of the mandible?

Answer 40

labial frenum, buccal frenum, lingual frenum, lingual frenum, mental foramen, genial tubercle, mandibular tori, mylohyiod ridge

Question 41

Where are the support areas of the mandible?

Answer 41

residual ridge, retromolar pad, buccal shelf area

Question 42

What are primary stress bearing areas?

Answer 42

areas that do not resorb even after loading

Question 43

What are secondary stress bearing areas?

Answer 43

do resorb but slowly