An In Vitro Study Of Fracture Of Flared Canal Teeth Restored With Three Post-and-Core Systems

Objective: To evaluate the fracture resistence of the flared canal teeth restoed with three post-and-core systems.Materials and methods: A total of 30 recently exacted human maxillary centra incisors were endodontically treated,ampulated partial crown,enlarged the root canal at cervical region and randomly divided into three groups of 10:Group A,cast metal post-and-core and crowned;Group B,grass fiber post combined resin core and crowned;Group C,fabricated parapost and resin core and crowned.Each speciment was mounted on the MTS810 universal test machine and subjected to a load at a 135 degrees angle to the long axis until failure. Results were analyzed statistically with one-way analysis of variance and SNK multiple comparison.Results: There was a statistically significant difference each other.The cast metal post-and-core group had the highest fracture strength (763.86± 86.38N),followed by the fabricated parapost and resin core group(619.91±118.19N) and grass fiber post combined resin core group had the lowest fracture strength(405.54±111.86N).Conclusion: According to the study the flared root canal teeth treated with cast metal post-and-core had highest fracture strength, but the fracture model of the grass fiber post and resin core group remained more tooth strcrture and allowed the possibility of repreparation.