Extension for prevention: margin 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

Northwest dentistry 2012 Mar-Apr

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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.