Occlusion 2

Question 1

2 ways to examine occlusion

Answer 1

1. Dynamic occlusion
   - Canine guidance
2. Static occlusion

Question 2

Why do we use 2 colours of articulating paper?

Answer 2

1 to mark static contact in the ICP

1 to mark dynamic contacts when in excursive positions

Question 3

What instruments do we need to mark tooth contacts? (2)

Answer 3

1. Millers forceps

2. Fine articulating paper

Question 4

When should we mark tooth contacts? (4)

Answer 4

BEFORE

1. Preparing a tooth
2. Removing a restoration

AFTER

1. Placement of a crown
2. Placement of a restoration

Question 5

What does the static occlusion include (7)

Answer 5

1. Incisor relationship
2. Molar relationship
3. OJ/OB
4. Xbites
5. Open bites
6. Individual tooth contacts
7. RCP-ICP slide

Question 6

What are functional cusps?

Answer 6

Cusps that occlude with the opposing teeth in ICP

Question 7

What are non-functional cusps?

Answer 7

Cusps that do not occlude with the opposing teeth in ICP

Question 8

How do we check ICP contacts?

Answer 8

Tap teeth together

Question 9

Whats the name for the incisor relationship?

Answer 9

Angles classification

Class I - normal
Class II div I - OJ increased
Class II div II - OB increased
Class III - Reverse OJ

Question 10

In what incisal relationsip is an OB most pronounced?

Answer 10

Class II div II

Question 11

Define a crossbite

Answer 11

Condition where one or more teeth may be abnormally malpositioned buccally/lingually or labially with reference to opposing teeth

Question 12

Define canine guidance (3)

Answer 12

1. Mandible moves to left for example so working side
2. Contact only between the canines
3. No posterior tooth contacts (a space)

This is whats known as a mutually protected occlusion

Question 13

Define grouped function (2)

Answer 13

• Mandible moves to the left (working side)

- Multiple teeth in contact on the left

Question 14

Give an example of a problem in dynamic occlusion

Answer 14

Occlusal interference
- Undesirable tooth contacts that may produce mandibular deviation during closure to ICP or may hinder smooth passage to and from ICP

Question 15

What are the different types of occlusal interference we may see? (3)

Answer 15

1. Working side
2. Non working side
3. Protrusive interference
   - Any posterior contact during protrusion

Question 16

What are the 2 types of bruxism?

Answer 16

1. Eccentric
   - Grinding
2. Centric
   - Clenching

Question 17

What are some clinical signs of bruxism? (4)

Answer 17

1. Toothwear
2. Fractured restorations
3. Tooth migration
4. Tooth mobility

Question 18

What are some symptoms of bruxism? (4)

Answer 18

1. Muscle pain + fatigue
2. Headache
3. Earache
4. Pain + stiffness in the TMJ + surrounding muscles

Question 19

What are the different types of toothwear? (4)

Answer 19

1. Abrasion
2. Attrition
3. Erosion
4. Abfraction

Question 20

Define occlusal trauma

Answer 20

Injury resulting in tissue changes within the attachment apparatus, including:

• Supporting alveolar bone + cementum

Question 21

Classification of occlusal trauma

Answer 21

1. PRIMARY
   - Intact periodontium
   - No perio disease but we still see movement due to occlusal trauma
2. SECONDARY
   - Reduced periodontium
   - Due to perio disease + we get movement due to occlusal trauma
3. FREMITUS
   - Palpable/visible movement of a tooth when subjected to occlusal forces

Question 22

Examination checklist for checking occlusion (6)

Answer 22

1. Incisor relationship
2. Guidance
3. OJ/OB
4. ICP contacts
5. Working/non working/protrusive contacts
6. Pathology