[Core build-ups from composites--evaluation of the technics of application]

The advantages and disadvantages of composite materials when used in direct core restoration of endodontically treated teeth is discussed. With the aid of dye penetration tests and scanning electron microscopy, in vitro fabrication of gold and amalgam cores were compared to those of 3 different composite core techniques. A compression technique used in the application of composite to the Radix -anchor post was judged successful. Neither modification of preparation nor application of a sealer before composite insertion improved margin adaptation or reduced microleakage of restoration margins. Acid etching of dentin definitely decreased marginal quality; therefore, for core construction using composites, the acid etch technique is not indicated. The proper use of composites is superior to gold and comparable to amalgam in core fabrication of endodontically treated teeth, when evaluating marginal adaptation and the reduction of microleakage at the composite-dentin interface.