microtensile bond strength of translucent glass fiber posts to intra-radicular dentin

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.