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1 College of Dentistry, University of Iowa, Iowa City, Iowa 52242, USA
A comparison was made of the dentinal crazing formation and pull-out strength of conventional retention pins and modified machinist's taps. Modified machinist's taps produced less dentinal crazing in wet, fresh, and dried dentin than the conventional retention pins. Modified taps have sufficient pull-out strength to retain restorations on teeth with fresh dentin, in clinical situations.
Submitted on August 9, 1973
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