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Abstract
This study examined the effect of post length and modulus of elasticity on the fracture resistance of restored endodontically treated anterior teeth versus none endodontically treated teeth. A total of 55 maxillary incisor teeth were used. The teeth were divided into 3 groups according to type of post used: group 1: (n = 11) teeth with no root canal treatment. group 2: (n = 22) endodontically treated teeth restored with everStick fiber post. group 3: (n = 22) endodontically treated teeth restored with RelyX fiber post. group 2 and 3 were further subdivided into 2 groups according to the length of the post used: subgroup a: (n=11) post 1 / 2 of the root length. Subgroup b: (n = 11) post 2/3 of the root length. The posts were cemented with self - adhesive resin cement (RelyX u200). All samples were subjected to fracture resistance testing under a compressive load at 135{u00B0} degrees to their long axis using computer controlled universal testing machine. Data were collected and statistically analyzed. After fracture testing, fracture patterns and failure mode of all samples were examined visually and by stereomicroscope. The highest fracture resistance value was recorded by the intact teeth control group (462.89 ± 104.51 N) followed by everStick post 2 / 3 length group (400.63 ± 89.62 N), RelyX post 2 / 3 length group (391.91 ± 109.40 N), everStick post 1 / 2 length group (340.47 ± 105.44 N), while the lowest value was for the RelyX post 1/2 length group (339.28 ± 97.29 N). However, kruskal wallis test did not show any significant difference. Examination of the failure mode revealed that the (control group) and (everStick post group) had the highest percentage of favorable fracture