الفهرس 
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Abstract
The objective of this study is to evaluate the reliability of magnetic resonance imaging (MRI) compared with computed tomography (CT) for dental implant planning in respect to bone measurements . Methods: Five dry mandibles were submitted to MRI and CT exams. Each one had three specific sites identified with markers, The bone heights directly measured in the determined sites by four observers. The images generated by MRI & CT software used to measure the bone heights by ruler tool. The measurements compared with each other using the ANOVA test with a 0.05 significance level Results: The differences between the measurements obtained directly from the dry mandibles and the measurements from the MRI exams varied from 0.05 to 0.48 mm, with 3 sites being overestimated in MRI exams and 12 sites being underestimated. The differences between the measurements from the dry mandibles and CT exams varied from 0.78 to 1.86 mm, with 15 sites being overestimated in CT exams and 0 sites being underestimated. The differences between the measurements from the MRI and CT exams varied from 0.8 to 2.1 mm, with no sites giving higher values in MRI exams and all sites giving higher values in CT exams. There were no statistically significant differences between the three groups of measurements (P=0.558).Conclusion: The MRI, when compared with CT, MRI was found to be more reliable and accurate in respect to bone measurements for dental implant planning , and it is a good alternative method of imaging in diagnosis prior to dental implantation. especially in the mandible and mainly in cases where ionizing techniques must be avoided.