Extension for prevention: margin placement.
This article will review the concept of extension for prevention popularized by G.V. Black around the early 1900s. Concepts of extension and prevention have changed over the years with a more informed knowledge of the caries process, improved materials, cutting instruments, and techniques. The reasons for placement of the outline form relative to the tooth morphology, gingival tissue, relationship to adjacent teeth, and the choice of material will be described for all of the materials used in restorative dentistry. Research will be cited to support the scientific basis for outline form placement.
Department of Restorative Sciences, Division of Operative Dentistry, University of Minnesota School of Dentistry, 8-450 Moos Tower, 515 Delaware Street S.E., Minneapolis, Minnesota 55455, USA. larso004@umn.edu
Thomas D
TD
Larson
D001840:Dental Bonding / Q000379:methods* / Q000592:standards; D003731:Dental Caries / Q000517:prevention & control / Q000628:therapy*; D003737:Dental Cavity Preparation / Q000266:history / Q000379:methods*; D003738:Dental Cements / Q000145:classification / Q000627:therapeutic use; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000266:history / Q000379:methods*; D049672:History, 19th Century; D006801:Humans
D003738:Dental Cements