Abstract
Tensile force was applied to self-threading dentine pins embedded in cylinders of lightcured composite and the failure force determined. Failures were similar to those found in autopolymerized composite, and depended upon both the fracture toughness of the composite and the pin thread geometry. In addition, shadowing of the curing light by the pin reduced the effectiveness of the pins. Most effective retention was obtained when pins with a wide pitch thread were used in combination with the toughest composites.
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