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Flashcards in Cariology Deck (42)
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1

What pH can dentine dissolve?

6.7

2

Why does visual caries examination have low specifiticy

A number of dental conditions present clinically as changes in enamel colour/opacity/tecture/surface breakdwon

3

What is the main difference between ICDAS 5 and 6? 

5 is less than half the tooth. 6 is more than half. 

4

When would you do a prr over a fs? 

When some cavitation has occured

5

What are the goals of sealants? 

  1. Limit microbial adhesion and growth
  2. Optiise cleansibility
  3. Seal breached enamel

6

How does etching increase bonding? (4)

  • Increases surface area
  • Creates voids in rods, and opens dentine tubules which can be penetrated
  • Increased surface energy
  • Removal of debris

7

Why is a bevelled margin helpful for bonding? 

Creates a more favourable orientation of the enamel rods

Increases surface area

8

9

Is dentine bonding chemical or micromechanical with composite? 

Both. Penetration into dentine tubules + Collagen coupling with the OH group in HEMA component of resin. 

10

Why is a primer needed? 

Prevent collagen collapse

11

Dental amalgam is an alloy of:

  • Mercury
  • Silver
  • Copper 
  • Tin

12

What are the categories of care on a tx plan. 

A. STABILISATION

Primary - Emergency, Urgent

Secondary - Prevention, operative

B. REHABILITATION

C. MAINTENANCE AND MONITORING

 

13

14

how many mm of clean margin do you need before getting to affected dentine? 

2-3mm

15

How long does it take to repair a porous white spot lesion with plaque control 

2-3 weeks will become shiny and hard like normal enamel .

lesion underneath takes longer to repair. 

16

What is the golden triangle of minimally invasive dentistry

  1. The histology of the dental substrate is being treated
  2. Consideration of the practical operative techniques available to excavate caries minimally
  3. The chemistry/handling of adhesive materials used

17

What causes cracked cusp symptoms to appear? 

Fracture progression

18

When is cuspal overlay indicated (2)

  • Less than 2mm width
  • More than half the cusp is reduced

19

How much material is required for composite cuspal overlay? 

2mm

20

How long should 37% etch stay on for? 

30-60 seconds on enamel, 15 seconds on dentine

21

Notes on primer: 

  • Monomer which acts as intermediate between hydrophilic dentine and phobic adhesive
  • Dentine not too dry, not too wet
  • Apply and agitate 20 seconds
  •  

22

What is the role of adhesive? 

Resin extension which forms a hybrid layer

23

How is the smear layer of dentine overcome? 

Penetration with acidic monomer

24

What is the shear bond strength of freshly prepared enamel? 

20MPa

25

What is the shear bond strength of freshly prepared dentine? 

5-10MPa

26

What level of bleach is needed fro non vital bleaching

35%

27

2 reasons why non-vital teeth turn dark 

  • Trauma - internal bleeding
  • Cements used in RCT

28

4 disadvantages of non-vital bleaching: 

  1. Results not always predictable
  2. Risk of cervical root resorption
  3. Risk of soft tissue buns
  4. Reduce bond strength of enamel and dentine to composite resin

29

4 advantages of night guard vital bleaching: 

  1. Easy application
  2. Safety
  3. Low cost
  4. Successful in greater than 90%

30

2 reasons why you should do non-aesthetic fillings before whitening: 

  1. Sensitivity
  2. Hydrogen peroxide can reduce bond strength of composite resin