1. involves
2. Pulpal Considerations
3. Periodontal Considerations
4. prevention of Pulpal Injury
5. cause of Pulpal Injury
6. Proper Depth Reduction
7. Conservative Preparation
8. Proper Instrument Type, Condition and Pressure
9. Proper Marginal Location
10. Proper Marginal Configuration
11. Proper Margin Adaptation
12. adequate tooth reduction
13. correct contour of teeth
14. Subgingival Margin
15. Supragingival Margin
16. good oral hygiene
17. healthy epithelial attachment
18. tooth without plaque
19. good knowledge and skills of the dentist
20. esthetics
21. favorable location, least harmful