Class 3 Composite Prep

Question 1

Class 3 Definition

Answer 1

Cavaties on proximal surfaces of incisors and canines, not involving the incisal edge

Question 2

Clinical Steps (5)

Answer 2

1. Anesthesia is usually necessary : good for patient comfort and decreased salivary flow
2. Occlusal assessment to determine design
3. Select shade before dehydration
4. Isolate for increased bonding
5. Wedge if proximal contact is involved

Question 3

Which wall is unsupported in a class 3 prep

Answer 3

Facial Wall

Question 4

Treatment Options

Answer 4

1. Prevention and Reversal
2. Conservative Composite Restoration
3. Conventional Composite Restoration

Question 5

When would you use a conservative composite restoration

Answer 5

When it is only enamel cavitation
lesion is confined to enamel

Note: Treatment is a “saucer” “bowl” Shape

Question 6

T/F Amalgam is an effective treatment for class 3 composite restorations

Answer 6

False!!! No Amalgams

Question 7

Goal of the Class 3 Tooth Prep

Answer 7

1. Remove all defective & unsound tooth structure white maintaining convenient and conservative outline form
2. Locate Prep Margins - Must be on sound tooth structure
3. Only remove sound enamel to access carious dentin

Question 8

Advantages of a lingual approach

Answer 8

1. Facial enamel will stay conserved = Increased esthetic
2. Shade matching less critical
3. Discoloration/Deterioration less visible

Question 9

Advantages of Facial Approach

Answer 9

1. Facial access would conserve more tooth structure
2. Crooked Teeth
3. Lesion extends to facial surface
4. Replace previous restoration

Question 10

Initial Procedure

Answer 10

1. Anesthesia
2. Shade Selection - Value, Chroma, Hue
3. Occlusal Relationship
4. Isolation

Question 11

Prep Steps

Answer 11

1. Create access to faulty structure
2. Remove faulty structure
3. Create Convenience form

Question 12

How should the bur be aligned in a class 3 prep

Answer 12

It should be aligned 90 degrees to the lingual surface

Question 13

Burs to be used

Answer 13

Round 1 and 2

Pearl 329 and 330

Question 14

What are 3 things the outlines should not have in a class 3 prep

Answer 14

Should not:

1. include entire proximal contact
2. Extend onto facial surface
3. Extend subgingivally

Question 15

Final tooth Prep Steps

Answer 15

1. Remove infected dentin
2. Pulp Protection
3. Bevel placement on accessible enamel margins
4. Final cleaning and inspecting

Question 16

How is the remaining infected dentin removed after your initial prep

Answer 16

By using a round bur or small spoon excavator

Question 17

The only time old restorative material on the axial wall should be removed if:

Answer 17

1. Old material is amalgam
2. Caries indicated underneath radiographically
3. Tooth Pulp is symptomatic
4. Periphery of old material is not intact
5. Use of underlying dentin is necessary for stronger retention

Question 18

How should the facial wall be created in relation to the facial surface?

Answer 18

Parallel