Finish Lines of a Crown Preparation

The margins of crowns preparations in fixed Prosthodontics are place in three positions

  1. Supragingival
  2. Equigingival
  3. Subgingival

Advantages supra-gingival finish line:

  1. It is conducive for better periodontal health
  2. It facilitates accurate impression making
  3. It allows accurate assessment of the fit

Advantages of Equigingival finish line:

  1. It provides better better retention
  2. It is conducive for better periodontal health

Advantages of sub gingival finish line:

  1. It is used when additional retention is needed
  2. It is indicated in anterior zone where aesthetics is a prime consideration
  3. it is used in cervical erosion and root hypersensitivity cases