Abstracts (07)
Evaluation of Shear Strength At The Cement-Endodontic Post Interface
C. Maniatopoulos, R.M. Pilliar, and D.C. Smith
Faculty of Dentistry, University of Toronto
J Prosthet Dent 1988;59:662-669
Excessive axial loading of endodontic implants (posts) cemented into the root canals of teeth results in failure at the cement-post interface when smooth posts are used, whereas threaded or porous-surfaced posts fail at the cement-dentin interface. Similar results are expected for endodontic dowels because the two systems are similar. Micromechanical interlocking of the cement to the dentin should increase the shear strength of the cement-dentin interface. This enhancement could be accomplished by removing the smeared layer from the root canal walls with EDTA or by mechanical preparation of serrations into the dentinal surfaces. A stronger cement-dentin interface could result in the load-bearing capabilities of even porous-surfaced or threaded posts or dowels being limited by the cement-implant interface strength.
This study measured the strength of the cement-implant interface for posts prepared with different surface geometries and cemented with different cements. Specifically tensile and torsional shear strengths were determined.
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