الفهرس 
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Abstract
Osteoporosis is an important public health concern with personal and financial consequences. Not only does bone fragility imply a higher risk of fracture due to minimal trauma, but patients may also become bed-bound with secondary complications that may be life threatening in the elderly. This urges greater efforts in preventive and early detection measures. Assessment of jaw may be considered useful in early identification of patients at risk of osteoporosis and appropriately refer them for further densitometric assessment
The aim of this study was to assess the radiomorphometric, densitometric, and structural parameters of the mandible in CBCT in postmenopausal osteoporotic women and compare them with control group. Also to correlate between these parameters and vertebral BMD assessed by DXA.
This study consisted of 50 postmenopausal Egyptian women between the age of (55) and (70) years old. Based on their DXA results of the lumbar spine, they were classified into two groups, 25 participants were osteoporotic and 25 were healthy who served as a control group. CBCT scanning was performed using the same exposure parameters for each subject maximum within 2week after the DXA scan. Images were viewed using the MPR screen and slices were prepared to evaluate the radiomorphometric, densitometric, and structural parameters of the mandible.
Under the conditions of this study we found that:
• CBCT could be used to investigate mandibular radiomorphometric indices; we suggest that these indices can be used as a screening tool to refer patients at risk of osteoporosis to further densitometric analysis.
• Computed tomography cortical index (CTCI) showed a significant difference between the control and the osteoporotic group. Moreover both computed tomography mental index (CTMI) and computed tomography mandibular index (CTI) showed higher mean values in the control than in osteoporotic group and the differences were highly significant.
• A strong correlation between the measured indices and vertebral BMD DXA (t-score) was observed.
• Assessment of trabecular structure in radiographs by PI analysis is a simple technique for assessment the density of bone.
• Bone density measurements in CBCT showed were lower mean values in the osteoporotic group and the differences were highly significant. Also a high significant positive correlation was observed between bone density measurements in CBCT and vertebral BMD DXA (t-score).
• Fractal dimension analysis can be used to quantitatively assess bone geometric structure and to provide a reflection of trabecular bone micro-architecture.
• There was no significant difference regarding FD values between the control and osteoporotic groups. But a negative significant correlation was observed between FD and vertebral BMD DXA (t-score).