W4. Cavity preparation designs for direct restorations Flashcards

1
Q

I. Preparation types
1. What are the 3 preparation types?

A
  1. MACRO retention
  2. MACRO + MICRO retention
  3. MICRO retention
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2
Q

I. Preparation types
2. Describe MACRO retention

A
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3
Q

I. Preparation types
3. Describe MACRO + MICRO retention

A
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4
Q

I. Preparation types
4. Describe MICRO retention

A
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5
Q

II. Conventional preparation
1. Which principle is conventional preparation based on?

A

Based on Black’s principles

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6
Q

II. Conventional preparation
2. What are Black’s principles?

A
  1. Extension for prevention
  2. Preparation is always extended into dentin
  3. BOX shape
  4. CONVERGENT/ parallel walls, Isthmus, Dovetail
    (retention form)
  5. Flat pulpal and gingival walls (resistance form)
  6. MARGINS- on sound structure
  7. SECONDARY retention form
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7
Q

II. Conventional preparation
3. What does extension for prevention mean by Black’s principles?

A
  1. Preparation is extended into the not decayed surface
  2. Extension to self-cleaning surfaces (ducally orally)
  3. Unsupported enamel is always removed
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8
Q

II. Conventional preparation
4. What does Preparation always extended into dentin for prevention mean by Black’s principles?

A

Amalgam-minimalthickness1,5

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9
Q

II. Conventional preparation
5. What does MARGINS mean by Black’s principles?

A

ARGINS- on sound structure
-> Amalgam- 90 degrees

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10
Q

II. Conventional preparation
6. What does SECONDARY retention form mean by Black’s principles?

A

Retention lock, grooves, coves, skirts, pins, slots

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11
Q

II. Conventional preparation
7. Identify

A
  1. Dovetail
  2. Isthmus
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12
Q

II. Conventional preparation
8. Identify

A
  1. Amalgam
  2. Inlay (metal)
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13
Q

II. Conventional preparation
9A. Describe outline form?

A
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14
Q

II. Conventional preparation
9B. Describe retention form?

A
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15
Q

II. Conventional preparation
9B. Describe resistance form?

A
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16
Q

II. Conventional preparation
9B. Describe convenience form?

A
17
Q

II. Conventional preparation
10. What is the indication for conventional preparation?

A

The restorative material adheres to the tooth macromechanically.
1. Occlusally convergent walls (amalgam)
2. Almost parallel (1-2° divergent) walls (metal inlay)
3. NO enamel- NO micromechanical retention (adhesive technique)

18
Q

III. Beveled conventional preparation
1. Describe Beveled conventional preparation

A
  1. Conventional preparation + beveling of enamel margins + optionally secondary retention elements
  2. MACRO + MICROretention
19
Q

III. Beveled conventional preparation
2. What is the indication for Beveled conventional preparation?

A
  1. Changing old amalgam filling to composite
    (the shape and size of the cavity is defined by the existing restoration)
  2. Not enough enamel surface
    - Caries extends onto root surface
20
Q

IV. Beveling of enamel margins
1. Describe Beveling of enamel margins

A
  1. Only in enamel
  2. SURFACE ENLARGEMENT
  3. Width of bevel: 0,5-1mm, 45°
21
Q

IV. Beveling of enamel margins
2. When should we have NO Beveling of enamel margins?

A
  1. Occlusally- The thin edge breaks on occlusal forces
  2. In case of narrow vestibulo-oral aproximal box
22
Q

IV. Beveling of enamel margins
3. When should we have Beveling of enamel margins?

A
  1. In case of wide vestibulo-oral approximal box
  2. Enamel margins where there is no contact with the antagonist
23
Q

V. Minimal invasive preparation
1. Describe Minimal invasive preparation

A
  1. Composite fillings (use adhesive technique)
  2. Defect-oriented
  3. NO preventive extension
  4. NO special cavity design
24
Q

V. Minimal invasive preparation
2. When should we have no beveling during Minimal invasive preparation?

A
  1. Occlusally (masticatory forces)
  2. Enamel margins where there is contact with the antagonist
  3. Approximally-in case of narrow vestibulo-oral approxima lbox
25
Q

V. Minimal invasive preparation
3. When should we have beveling during Minimal invasive preparation?

A
  1. Enamel margins if there is no contact with the antagonist (not in occlusal)
  2. Approximal - in case of wide vestibulo-oral approximal box
26
Q

VI. Extra
1. Which material is used for the filling of class I caries?

A
27
Q

VI. Extra
2. What type of preparation should we use for class II caries?

A
  1. Conventional
  2. Beveled conventional
  3. Minimal invasive
28
Q

VI. Extra
3. What type of preparation should we use for class III caries (Root surface caries)?

A
  1. Conventional
  2. Beveled conventional
  3. Minimal invasive
  4. Beveled conventional+ Conventional
29
Q

VI. Extra
4. What type of preparation should we use for class IV caries?

A
  1. Conventional
  2. Beveled conventional
  3. Minimal invasive
30
Q

VI. Extra
5. What type of preparation should we use for class V caries?

A
  1. Conventional
  2. Beveled conventional
  3. Minimal invasive
  4. Modified conventional
31
Q

VI. Extra
6. What type of preparation should we use for class VI caries?

A

Minimal invasive preparation

32
Q

VI. Extra
7. What type of preparation should we use forRoot surface caries?

A

Conventional preparation