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Cariology/Fixed Pros > Cariology > Flashcards

Cariology Flashcards

1
Q

What pH can dentine dissolve?

A

6.7

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2
Q

Why does visual caries examination have low specifiticy

A

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

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3
Q

What is the main difference between ICDAS 5 and 6?

A

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

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4
Q

When would you do a prr over a fs?

A

When some cavitation has occured

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5
Q

What are the goals of sealants?

A
  1. Limit microbial adhesion and growth
  2. Optiise cleansibility
  3. Seal breached enamel
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6
Q

How does etching increase bonding? (4)

A
  • Increases surface area
  • Creates voids in rods, and opens dentine tubules which can be penetrated
  • Increased surface energy
  • Removal of debris
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7
Q

Why is a bevelled margin helpful for bonding?

A

Creates a more favourable orientation of the enamel rods

Increases surface area

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8
Q
A
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9
Q

Is dentine bonding chemical or micromechanical with composite?

A

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

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10
Q

Why is a primer needed?

A

Prevent collagen collapse

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11
Q

Dental amalgam is an alloy of:

A
  • Mercury
  • Silver
  • Copper
  • Tin
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12
Q

What are the categories of care on a tx plan.

A

A. STABILISATION

Primary - Emergency, Urgent

Secondary - Prevention, operative

B. REHABILITATION

C. MAINTENANCE AND MONITORING

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13
Q
A
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14
Q

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

A

2-3mm

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15
Q

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

A

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

lesion underneath takes longer to repair.

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16
Q

What is the golden triangle of minimally invasive dentistry

A
  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
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17
Q

What causes cracked cusp symptoms to appear?

A

Fracture progression

18
Q

When is cuspal overlay indicated (2)

A
  • Less than 2mm width
  • More than half the cusp is reduced
19
Q

How much material is required for composite cuspal overlay?

A

2mm

20
Q

How long should 37% etch stay on for?

A

30-60 seconds on enamel, 15 seconds on dentine

21
Q

Notes on primer:

A
  • Monomer which acts as intermediate between hydrophilic dentine and phobic adhesive
  • Dentine not too dry, not too wet
  • Apply and agitate 20 seconds
    *
22
Q

What is the role of adhesive?

A

Resin extension which forms a hybrid layer

23
Q

How is the smear layer of dentine overcome?

A

Penetration with acidic monomer

24
Q

What is the shear bond strength of freshly prepared enamel?

A

20MPa

25
Q

What is the shear bond strength of freshly prepared dentine?

A

5-10MPa

26
Q

What level of bleach is needed fro non vital bleaching

A

35%

27
Q

2 reasons why non-vital teeth turn dark

A
  • Trauma - internal bleeding
  • Cements used in RCT
28
Q

4 disadvantages of non-vital bleaching:

A
  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
Q

4 advantages of night guard vital bleaching:

A
  1. Easy application
  2. Safety
  3. Low cost
  4. Successful in greater than 90%
30
Q

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

A
  1. Sensitivity
  2. Hydrogen peroxide can reduce bond strength of composite resin
31
Q
  • During opening, the muscle pulls the disc forward
A

Lateral pterygoid muscle (inferior attachemd)

32
Q

During closing, the muscle pulls the disc upward toward the slope of the joint

A
33
Q

What muscles are involved in mouth opening

A
  • Lateral pterygoid (inferior)
  • Accessory
34
Q

What muscles are involved in mouth closing

A
  • Temporalis
  • Masseter
  • Medial pterygoid
  • Lateral pterygoid (superior)
35
Q

What are the implications of group function on restoration?

A
  • Posterior restorations will be under more loading so increased likelihood of fracture.
  • Tensile forces on composite as opposed to desired compressive force
36
Q

A contact that displaces a tooth, diverting the mandible from its intended path. Usually caused by high restoration or cusp.

A

Premature contact

37
Q

Any tooth contacts that interfere with or hinder harmonious mandibular movement is called

A

an Interference

38
Q

Blue articulating paper should be used for:

Red should be used for:

A
  • Blue for MI
  • Red for excursive
39
Q

How to do occlusion of fillings:

A
  1. Get patient to bite up and down on blue and adjust until does not feel high. Should be point contact on cusp tips.
  2. Get patient to chew on red paper, then bite up and down on blue.
  3. Any marks that are blue and red - keep
  4. Any marks that are red only - interferences - remove.
40
Q

Name 6 tips to reduce potential loading on teeth

A
  1. Ensure axial loading
  2. Load closes to the fulcrum
  3. Flatten cusps
  4. Control excursive guidance
  5. Flatten occlusal planes
  6. Material selection
41
Q
A
42
Q
A

Cariology/Fixed Pros (3 decks)

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