Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 6 1 2009 03 15 23 28 N. Mohammadi Assistant Professor, Department of Operative Dentistry, School of Dentistry, Tabriz University of Me M. Abed Kahnamoui Assistant Professor, Department of Operative Dentistry, School of Dentistry, Tabriz University of Me ME. Ebrahimi Chaharom Assistant Professor, Department of Operative Dentistry, School of Dentistry, Tabriz University of Me S. Kimyai Assistant Professor, Department of Operative Dentistry, School of Dentistry, Tabriz University of Me M. Bahari Associate Professor, Department of Operative Dentistry, School of Dentistry, Tabriz University of Me 2015 10 03 Objective: The aim of the present study was to compare microtensile bond strengths (μTBS) of glass fiber posts to different parts of intra-radicular dentin using conventional method and one-shot technique under different light intensities. Materials and Methods: Twenty-eight single-rooted teeth were prepared to receive fiber posts: Group 1: Conventional method at light intensity of 600 mW/cm2; Groups 2, 3 and 4: One-shot technique at light intensities of 600, 800 and 1000 mW/cm2 respectively. Dumbbell- shaped slices were obtained from the samples and submitted to micro-tensile testing. The data were analyzed using two-way ANOVA and paired-samples t-test. Results: There were no significant differences in μTBS values of the cervical and middle thirds between the groups (P>0.05). μTBS values in the cervical thirds in groups 2 and 3 were significantly higher than those in the middle thirds (P>0.05). However, there were no such differences in groups 1 and 4 (P>0.05). Conclusion: It is proper to simultaneously cure the resin cement and the adhesive agent (one-shot technique); however, in that case, high light intensities (1000 mW/cm2) are recommended to achieve identical bond strength values in the cervical and middle thirds. https://fid.tums.ac.ir/index.php/fid/article/view/174 https://fid.tums.ac.ir/index.php/fid/article/download/174/174