Abstract
Purpose: The aim of this study was to find an optimal post-and-core method for endodontically treated teeth with flared canals.
Materials and Methods: Four kinds of composite resin core methods (composite resin post and core, a prefabricated fiber post and composite resin core, three prefabricated fiber posts and composite resin core, a prefabricated fiber post with sleeve and composite resin core) with and without fiber posts combined with two kinds of composite resin core material were compared regarding the bending strength and elastic modulus by the three-point bending test. Furthermore, as for experimental abutment teeth, typical human central incisors were modeled using bovine incisor teeth. Totally five methods adding one more method of cast post-and-core were compared regarding failure strength and failure modes by a fracture resistance test.
Results: As indicated the by three-point bending test, both composite resin core methods with three fiber posts and a sleeve showed higher bending strength in both core materials than composite resin core material with only one fi ber post. With the fracture resistance test, the conventional cast post-and-core method revealed the highest failure strength, though its failure mode was absolutely un-restorable. On the contrary, the failure modes of the other four methods were mainly restorable.
Conclusion: Disposition of plural fiber posts and one fiber post with a sleeve can be recommended for restoration of endodontically treated teeth with flared root canals.
