Bulk Fill Composites

Question 1

What is SDR stand for?

Answer 1

Smart Dentine Replacement

Question 2

What is SDR?

Answer 2

Bulk-fill flowable base composite with reduced polymerization stress

Question 3

Name 3 properties of SDR

Answer 3

1. Contains fluoride
2. Visible light cured
3. Radio-opaque

Question 4

Name 5 advantages of SDR

Answer 4

1. Handling characteristics typical of flowable composite
2. Can be cured in 4mm increments
3. Self-levelling
4. Up to 40% time saving
5. Reduced risk for post operative sensitivity and secondary caries

Question 5

Describe how to avoid air bubbles when using SDR

Answer 5

Backfill i.e. ensure canula tip buried inside material when filling

Question 6

What is important with regards to filling a class I cavity with SDR?

Answer 6

Leave 2mm space for application of the cap composite

Question 7

What is the main purpose of SDR being radiopaque?

Answer 7

Ensure diagnosis of secondary caries

Question 8

Describe the conclusion of evaluation of Class I and Class II cavities filled with SDR

Answer 8

4mm bulk fill technique showed good clinical effectiveness during 3 year follow up

Question 9

How many shades of SDR are available?

Answer 9

4

Question 10

What is the biggest disadvantage of SDR?

Answer 10

When placing in cavity on a patient in supine position, the material will display some distal drift

Question 11

Name 3 ways to avoid distal drift of SDR

Answer 11

1. Cure immediately
2. Use sharp probe to drag SDR mesially if beginning to drift
3. Place in smaller increments than 4mm

Question 12

Name 2 disadvantages of composite layering technique

Answer 12

1. Time consuming process

2. Inconvenient (frequent changing of instruments)

Question 13

Describe why bulk placement is not possible with conventional composites

Answer 13

Shrinkage imposes stress on tooth surfaces or adhesion which may lead to detachment of composite and / or adhesive from cavity surfaces

Question 14

Name 3 possible consequences of shrinkage stress of traditional composites

Answer 14

1. Gap formation
2. Post operative sensitivity
3. Recurrent caries

Question 15

What does C-factor stand for?

Answer 15

Cavity configuration

Question 16

What is C-factor?

Answer 16

Ratio of bonded to unbonded surface area

Question 17

How is C factor calculated?

Answer 17

C = Bonded surfaces / Unbonded surfaces

Question 18

Describe how increasing C-factor affects composite restorations

Answer 18

As C-factor increases curing contraction stresses of bonded restorations increases

Question 19

What is sonic fill?

Answer 19

Sonic activated nano-hybrid composite

Question 20

What is sonic fill used for?

Answer 20

Bulk filling material for posterior teeth which combines attributes of universal and flowable composite

Question 21

What depth can sonic fill be applied?

Answer 21

Up to 5mm

Question 22

Describe the curing of sonic fill

Answer 22

• Material applied to cavity and pressed down to eliminate voids
• Light cured for 20s occlusally, 10s buccally and 10s lingually