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  • Title: The retention of amalgam and composite resin by a smooth, reverse-tapered pin.
    Author: Brackett WW, Bailey JH.
    Journal: Oper Dent; 1992; 17(4):152-5. PubMed ID: 1287596.
    Abstract:
    In this study, the retention of composite resin and amalgam by a smooth, reverse-tapered pin was compared to that of threaded pins. The smooth pin was significantly lower in retention than the threaded pins for each material, and caused a greater frequency of failure of the restorative material than the threaded pins. The newer smooth pin is probably not an improvement over the conventional threaded design.
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