IADR Abstract Archives
Fracture Resistance of endodontically treated teeth of different Ferrule lengths restored with all ceramic crowns using two types of posts
Objectives: The aim of this study is to compare the fracture resistance of endodontically treated teeth prepared with different ferrule lengths: two mm ferrule, one mm ferrule and zero mm ferrule and restored with all ceramic crowns, using non metallic fiber esthetic posts with two designs
Methods: Thirty maxillary central incisors were endodontically treated, then teeth were prepared, with different ferrule lengths: two mm ferrule, one mm ferrule and zero mm ferrule and restored with all ceramic crowns, using non metallic fiber esthetic posts with two designs tapered fiber post and parallel fiber post. Posts were cemented using resin cement. Composite cores were built using core formers. Ceramic crowns were constructed Using E-Max press. Surface treatment was done for each full ceramic crown fitting surface using hydrofluoric acid and silane coupling agent and cemented using adhesive resin cement. Afterwards the samples were subjected to compressive force till failure using universal testing machine
Results: The results showed that regardless to post type, it was found that Two mm ferrule subgroup recorded statistically significant highest fracture resistance mean value (389.607 N) followed by One mm ferrule subgroup (347.993 N) while Zero mm group recorded statistically significant lowest fracture resistance mean value (252.829 N) as indicated by two way ANOVA followed by pair-wise Student Newman keuls post-hoc tests. Tapered post group recorded statistically non-significant higher fracture resistance than parallel group .The mode of failure of most samples was favorable mode that occurred at or above the simulated bone level without root destruction nor post fracture nor crown destruction
Conclusions: It was concluded that the presence of 2 mm ferrule improved the fracture resistance of endodontically treated teeth and that ferrule existence was more effective than post shape for the protection of endodontically treated teeth restored by all ceramic crowns against fracture. The mode of failure of most samples was favorable.
Methods: Thirty maxillary central incisors were endodontically treated, then teeth were prepared, with different ferrule lengths: two mm ferrule, one mm ferrule and zero mm ferrule and restored with all ceramic crowns, using non metallic fiber esthetic posts with two designs tapered fiber post and parallel fiber post. Posts were cemented using resin cement. Composite cores were built using core formers. Ceramic crowns were constructed Using E-Max press. Surface treatment was done for each full ceramic crown fitting surface using hydrofluoric acid and silane coupling agent and cemented using adhesive resin cement. Afterwards the samples were subjected to compressive force till failure using universal testing machine
Results: The results showed that regardless to post type, it was found that Two mm ferrule subgroup recorded statistically significant highest fracture resistance mean value (389.607 N) followed by One mm ferrule subgroup (347.993 N) while Zero mm group recorded statistically significant lowest fracture resistance mean value (252.829 N) as indicated by two way ANOVA followed by pair-wise Student Newman keuls post-hoc tests. Tapered post group recorded statistically non-significant higher fracture resistance than parallel group .The mode of failure of most samples was favorable mode that occurred at or above the simulated bone level without root destruction nor post fracture nor crown destruction
Conclusions: It was concluded that the presence of 2 mm ferrule improved the fracture resistance of endodontically treated teeth and that ferrule existence was more effective than post shape for the protection of endodontically treated teeth restored by all ceramic crowns against fracture. The mode of failure of most samples was favorable.