occlusion

Question 1

what are the three parts of the masticatory system?

Answer 1

• occlusion
• TMJs
• muscles of mastication

Question 2

when is occlusion important?

Answer 2

reduce risk of fracture/wear/failure
- restoration

Question 3

when is present in the periodontal ligament which can detect materials between teeth down to 1/2 thickness of a human hair?

Answer 3

propiioreceptors

Question 4

what does each cusp have?

Answer 4

• ridge
• tip
• slope

Question 5

what is used to check the occlusal contacts?

Answer 5

articulating paper

Question 6

what is the conformative approach?

Answer 6

keep the occlusion the same before and after restoration

Question 7

what is the static occlusion?

Answer 7

• centric occlusion
• habitual bite
• max intercuspation
• intercuspal position (ICP)

Question 8

what is the dynamic occlusion?

Answer 8

• mandibular eccentric movements
• lateral excursion

Question 9

what is the name of the side of the jaw it moves to?

Answer 9

working side

Question 10

what is the most common articulating paper size?

Answer 10

<40u

Question 11

why is thin articulating paper desirable?

Answer 11

for a precise marking- minimise contact artefacts

Question 12

what is the device which electronically records the occlusal contacts and pressure?

Answer 12

T scan

Question 13

how is articulating paper used?

Answer 13

placed simultaneously on both sides to prevent displacement of the mandible

Question 14

what should be used to grip the articulating paper?

Answer 14

miller forceps

Question 15

what is important to do to teeth before using articulating paper?

Answer 15

dry the teeth

Question 16

what colours of articulating paper is used for static occlusion?

Answer 16

black

Question 17

what colour of articulating paper is used for dynamic occlusion?

Answer 17

red

Question 18

what does more spread colour represent?

Answer 18

higher pressure

Question 19

what does an area of wear near the point of occlusion mean?

Answer 19

patient is grinding their teeth

Question 20

where does the main cusp lie in the occlusion?

Answer 20

in the fossa

Question 21

what is the name of the upper palatal and lower buccal cusps?

Answer 21

functional cusps

Question 22

what is tripodization?

Answer 22

three points of contact around a fossa for stability

Question 23

what is shimstock foil?

Answer 23

8u thin
- indicates occlusal contact if held between teeth

Question 24

Anatomy of the TMJ

Answer 24

Question 25

What is the function of the TMJ?

Answer 25

Allows movement of the jaw

Question 26

What are extra-oral signs of malocclusion?

Answer 26

• asymmetry
• clicking TMJ
• trauma lesions on lips

Question 27

What are intraoral signs of malocclusion?

Answer 27

• scalloped margins on tongue
• trauma lesions on gingiva
• worn teeth

Question 28

What can be used to assess a patients contact points?

Answer 28

• articulating paper
• shimstock
• cast/3D models

Question 29

What is the thickness of shimstock?

Answer 29

8 microns

Question 30

What is ICP?

Answer 30

Intercuspal position

Question 31

What do lower incisors and canine tips occlude against in the ICP?

Answer 31

The upper cingulum

Question 32

Which impressions should be taken first and why?

Answer 32

Lower, doesn’t trigger a gag reflex

Question 33

What indicates a good impression?

Answer 33

• full anatomy of the arch
• uniform
• rounded edges indicate depth of sulcus
• no visible tray showing through the impression

Question 34

What is used to take a bite registration?

Answer 34

A softened and folded wax wafer

Question 35

What is the definition of occlusion?

Answer 35

The study of relationships between the upper and lower teeth when they are closed together

Question 36

What is the functional purpose for bringing the teeth together?

Answer 36

For chewing and swallowing

Question 37

What does the working side TMJ do?

Answer 37

Rotates

Question 38

What does the non working side TMJ do?

Answer 38

Translates