AN EVALUATION OF ASSOCIATION BETWEEN CROWN MARGINS & MATERIALS WITH THE PERIODONTAL HEALTH YawarAliAbidi*

The aim of any prosthodontic treatment plan is to restore the lost or missing tissue with prosthesis. This prosthesis should be compatible with existing hard and soft tissues and fulfill the functional and aesthetic requirements as well. It is important for the treating clinician to be knowledgeable about the interactions of these prosthodontic appliances with oral tissues and consequences of violating the integrity of these structures. Indirect restorations in the form of crowns and fixed partial dentures come in close proximity of the periodontal tissues. This interaction of margin of a fixed prosthesis with gingival tissue was classified by Gardner into three types, namely supra-gingival: if the margin terminated above the level of marginal gingival, juxta-gingival: if the margin lies at the level of marginal gingival and subgingival: if margin lies below the level of marginal gingival into the gingival sulcus.