Fundamentals of extracoronal tooth preparation. Part I. Retention

CLASSIC ARTICLE Fundamentals of extracoronal tooth preparation. Part I. Retention and resistance form Dennis B. Gilboe, DDS,a and Walter R. Teteruck, DDS, MSDb College of Dentistry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada The... More

CLASSIC ARTICLE Fundamentals of extracoronal tooth preparation. Part I. Retention and resistance form Dennis B. Gilboe, DDS,a and Walter R. Teteruck, DDS, MSDb College of Dentistry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada The differential selection and application of retention and resistance form in tooth preparation depend upon the individual clinical situation. Since the ‘‘textbook ideal’’ is not often encountered clinically, knowledge of basic principles and factors is mandatory for the successful preparation of extracoronal restorations. Black1 astutely recognized and stressed the importance of these two basic characteristics. He stated: ‘‘Resistance form is that shape given to a cavity intended to afford such a seat for the filling as will best enable it to withstand the stress brought upon it in mastication. Retention form is the provision for preventing it from being dislodged. ’’ More recent concepts tend to emphasize the duplication of a preconceived Less