Roof fracture is one of the most seriuos complications following restoration of endodontically treated teeth. Objective: This study compared the compressive tensile strengths of endodontically treated teeth varying the quantity of coronal remaining dentin. Methods: Fifty freshly extracted canines were endodontically treated. Groups of 10 teeth were prepared according to five experimental designs. Control group: teeth with custom cast post and core; Group 1: teeth without coronal remaining; group 2 : teeth with 1 mm of coronal remaning; groups 3 and 4 teeth with 2 mm and 3 mm, respectively. All specimes were restored with pre-fabricated post and resin core. The teeth were embedded in a acrilic resin and the fracture resistance was meansured by a universal testing machine at 45 degrees to the long axis of the tooth until failure. Data were analyzed by use of a 1-way analysis of variance and Tukey test at 95% level of confidence (p<0.05). Results: The 1-way analysis of variance revealed significant differences among the groups (p=0.00). The Tukey test didn't show significant differences between control group and group 1, between group 1 and 2 and among groups 2, 3 and 4. (p<0,05). Conclusion: The results of this study suggested that the quantity of coronal remaining dentin did not significantly increase the fracture resistence of endodontically treated teeth.

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