W4. Cavity preparation designs for direct restorations Flashcards
I. Preparation types
1. What are the 3 preparation types?
- MACRO retention
- MACRO + MICRO retention
- MICRO retention
I. Preparation types
2. Describe MACRO retention
I. Preparation types
3. Describe MACRO + MICRO retention
I. Preparation types
4. Describe MICRO retention
II. Conventional preparation
1. Which principle is conventional preparation based on?
Based on Black’s principles
II. Conventional preparation
2. What are Black’s principles?
- Extension for prevention
- Preparation is always extended into dentin
- BOX shape
- CONVERGENT/ parallel walls, Isthmus, Dovetail
(retention form) - Flat pulpal and gingival walls (resistance form)
- MARGINS- on sound structure
- SECONDARY retention form
II. Conventional preparation
3. What does extension for prevention mean by Black’s principles?
- Preparation is extended into the not decayed surface
- Extension to self-cleaning surfaces (ducally orally)
- Unsupported enamel is always removed
II. Conventional preparation
4. What does Preparation always extended into dentin for prevention mean by Black’s principles?
Amalgam-minimalthickness1,5
II. Conventional preparation
5. What does MARGINS mean by Black’s principles?
ARGINS- on sound structure
-> Amalgam- 90 degrees
II. Conventional preparation
6. What does SECONDARY retention form mean by Black’s principles?
Retention lock, grooves, coves, skirts, pins, slots
II. Conventional preparation
7. Identify
- Dovetail
- Isthmus
II. Conventional preparation
8. Identify
- Amalgam
- Inlay (metal)
II. Conventional preparation
9A. Describe outline form?
II. Conventional preparation
9B. Describe retention form?
II. Conventional preparation
9B. Describe resistance form?