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• W1935934339 endingPage "8" @default.
• W1935934339 startingPage "121" @default.
• W1935934339 abstract "The survival of pulpless teeth restored with different post and core systems is still a controversial issue.This study compared the retention of two different post and core systems and also the fracture resistance of teeth restored with these systems.Eighty endodontically treated maxillary central incisors were sectioned perpendicular to the long axis at a point 2mm incisal to the cemento-enamel junction (CEJ) and then the root canals were obturated. The restored teeth were randomly divided into two equal groups of 40. One group was restored with Nickel-Chromium (Ni-Cr) post and core system and the other group with Non-Precious Gold alloy (NPG) system. For evaluation of fracture resistance of the restored teeth, the specimens (n=20 per each group) were mounted in acrylic resin blocks and a layer of polyvinyl siloxane was applied to cover the roots. Loads were applied at an angle of 45 degrees to the long axis of the teeth and measured with a universal testing machine. The axial retention values of the studied groups (no=20) were measured on an Instron testing machine at a crosshead speed of 0.5 mm/min. Statistical analyses were performed using SPSS version 19.00 and student's t-test (α=0.05).Although retention failure load for Ni-Cr system was lower than NPG system, there was no significant difference between the two systems (p= 0.7). However, fracture resistance of the teeth restored with Ni-Cr post and core system was significantly higher than NPG group (p= 0.000).There was no significant difference between the retention of the studied post and core systems. Although significantly higher fracture thresholds were recorded for Ni-Cr post and core group, the failure loads of both systems may rarely occur clinically." @default.
• W1935934339 created "2016-06-24" @default.
• W1935934339 creator A5037768808 @default.
• W1935934339 creator A5039234945 @default.
• W1935934339 creator A5056444326 @default.
• W1935934339 date "2015-06-01" @default.
• W1935934339 modified "2023-10-17" @default.
• W1935934339 title "Evaluation of Retention of two Different Cast Post-Core Systems and Fracture Resistance of the Restored Teeth." @default.
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• W1935934339 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4445850" @default.
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• W1935934339 hasPublicationYear "2015" @default.
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