الفهرس 
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Abstract
The jaws are host to a wide variety of cysts and neoplasms, since a variety of tissues are involved in tooth formation. Many l1enign jaw tumors and several cysts. of both odontogenic and nonodontogenic origin, can
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exhibit a biologically aggressive course and can be diagnostically difficult.
Cone beam CT is recently-designed technology which became a relevant tool for oral and maxillofacial diagnostic osseous imaging, providing to professionals access to excellent image quality and greater diagnostic accuracy and sensitivity. In addition, CBCT allows images to be acquired using a low dose of radiation, shorter patient examination time, and lower costs, which makes its routine use feasible for oral and maxillofacial procedures.
Aim of the study was to determine the accul;acy & reliability of Cone beam computed tomography (CBCT) & whether it is a valuable diagnostic_ aid in pre-surgical planning for management of maxillo-faciallesions .
A total number of 20 patients with either maxillary or mandibular lesions were treated in the Oral & Maxillofacial surgery department at Minia University Dental Hospital. Case.s were 10 males & 10 females with ages ranging between 6 & 61 years old.
All the investigated cases went throughout the following diagnostic schedule:
- History
- Clinical examination
Pre-operative radiographic examination using cone beam CT.
radiographic analysis included assessment of the lesion dimensions in axial,coronal and sagittal views, assessment of the location, periphery & shape, size and the internal structure of the lesion and evaluation of the lesion }dationship and its the effect of the sun-ounding structure.
_ Intra-operati’:ely each lesion was assessed regarding its size, ehtension, relationship and the effect of the lesion on the surrounding structures. The dimensions of each lesion were measured by two different ways either by using metal spherical markers for respectable lesions or by taking impressions for cavities in collapSed lesions .Measurements were done by using specialized digital millimeter caliper.
_ Results have shown that there is no significant difference between CBCT findings and Intra-operative findings and the CBCT is highly accurate in detection of the lesion relationship with the surrounding
structures.
_ The following could be concluded:
1) Cone beam CT showed has high diagnostic capabilities. It provides valuable diagnostic information which aids in accurate diagnosis.
2) Pre-operative evaluation of maxillofacial lesions using either cone beam CT very helpful in deciding a good treatment plane to avoid surgical complications and post-surgical functional impairment, and reduce
surgical stresses.
3) CBCT provides images reliably applied in linear measurement analysis.
4) On imaging maxillofacial lesions, Cone beam CT could be preferred over conventional CT only on the basis of doze reduction, lower costs & rapid
time-scanning.