الفهرس 
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Abstract
This study was established to evaluate the significance of using the ratio between trabecular and compact bone volumes using MIMICS software in the diagnosis of osteoporotic patients. It was aimed also to assess the correlation between this ratio and computed tomography mandibular indices. Methods : Fifty CBCT images from postmenopausal females aged 45-60 was divided based on DXA scan into two groups Control group of normal healthy females (T score > -1), Study group with osteoporotic females (T score ≤ - 2.5). Total bone volume of compact and trabecular, at mental foramen region in the mandible, were calculated separately and semi-automatically using threshold and segmentation tools in the software. Results : Regarding Trabecular/Compact bone volume ratio, the mean ± standard deviation of normal group (I) was (0.44±0.88), While for osteoporotic group (II), was (0.35±0.73), Performing significance assessment of both groups, there was insignificant difference between both groups as P-value > 0.05. Regarding (CTMIS), Pearson`s Correlation Coefficient (r) was nonsignificant weak positive correlation with Trabecular/Compact bone volume as r < 0.05. While for (CTMII), Pearson`s Correlation Coefficient (r) was insignificant positive correlation with Trabecular/Compact bone volume as r < 0.05. Finally, with (CTMI), Pearson`s Correlation Coefficient (r) was insignificant weak positive correlation with Trabecular/Compact bone volume as r < 0.05. Conclusion : There’s no obvious difference in the rate of bone resorption between normal and osteoporotic females. There is a weak correlation between trabecular/compact bone ratio and CBCT mandibular indices (CTMIS, CTMII and CTMI).