STATEMENT OF PROBLEM: Very little is known about the resistance to @entity15296 restored with newly developed esthetic post systems. Purpose. This in vitro study compared the effect of 1 @entity702 and 3 esthetic post systems on the @entity174 resistance and @entity174 patterns of crowned, endodontically treated @entity4500 . MATERIAL AND METHODS: A total of 40 recently extracted @entity1 maxillary @entity235 with their crowns removed were endodontically treated. Four groups of 10 specimens were formed. Teeth were restored with @entity702 , @entity3674 fiber, glass fiber, and zirconia posts and numbered as groups 1, 2, 3, and 4, respectively. All posts were cemented with Single Bond dental adhesive system and dual-polymerizing RelyX ARC adhesive resin cement. All @entity4500 were restored with composite cores, and metal crowns were fabricated and cemented with glass ionomer cement. Each specimen was embedded in acrylic resin and then secured in a universal load-testing machine. A compressive load was applied at a 130-degree angle to the long axis of the tooth until @entity174 , at a crosshead speed of 1 mm/min. One-way analysis of variance and a Tukey test were used to determine the significance of the failure loads between groups (P<.001). A non-parametric chi(2) test was conducted for evaluation of the mode of failure (P<.001). RESULTS: The mean failure loads (kg) were 66.95, 91.20, 75.90, and 78.91 for groups 1 to 4, respectively. Teeth restored with @entity3674 fiber posts (group 2) exhibited significantly higher resistance to @entity174 (P<.001) than the other 3 groups. Teeth restored with glass fiber and zirconia posts (groups 3 and 4) were statistically similar (P>.05). @entity174 that would allow repair of the tooth were observed in groups 2 and 3, whereas unrestorable, catastrophic @entity174 were observed in groups 1 and 4 (P<.001). CONCLUSION: Within the limitations of this study, significantly higher failure loads were recorded for root canal treated @entity4500 restored with @entity3674 fiber posts. @entity174 that would allow repeated repair were observed in @entity4500 restored with @entity3674 fiber and glass fiber posts.

Resistance to XXXX restored with different post systems.

@entity1 :: ('9606', 'Species') :: ['human'] @entity174 :: ('MESH:D050723', 'Disease') :: ['fractures', 'Fractures', 'fracture'] @entity235 :: ('9615', 'Species') :: ['canines'] @entity15296 :: ('MESH:D019553', 'Disease') :: ['fracture of endodontically treated teeth'] @entity3674 :: ('MESH:D011791', 'Chemical') :: ['quartz'] @entity702 :: ('MESH:D014025', 'Chemical') :: ['titanium'] @entity4500 :: ('MESH:D014071', 'Disease') :: ['teeth']
@entity15296 :: (MESH:D019553,Disease) :: ['fracture of endodontically treated teeth']
