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Background.Cone-beam computed tomography is a new application of Computed Tomography that generates three-dimensional data at lower cost and absorbed doses than conventional Computed Tomography found in the practice of medical radiology. The objectiveness of this study was To explore the diagnostic values of cone beam Computed Tomography (CBCT) in the determination of periodontal furcation involvements in molar area.in smoker and non smoker young subjects Materials and Methods: forty subjects were included in the study ,they were free from any systemic disease their age group were range between 15-20 years old , they were divided in to two groups each group composed of 20 subjects first groups was smokers, they were smoke at least 10 cigarettes per day , smoking status was assessed by means of a self reported questionnaire which include :whether the subject had ever used any tobacco products , number of cigarettes smoke per day in addition to recording name of the subjects, age and gender while the second group was non-smokers free from any systemic disease For Cone-beam computed tomography scanning, the system we use in our study was Kodak 9500 CBCT Results: there was an equal number of male and female in smokers group while in non –smokers group the number of male was 13 while the number of female was7.inter group comparison of means of plaque and gingival index show anon significant difference between smokers and non smokers group where the pvalue>0.05while Inter group comparison for the furcation involvement using cone beam computed tomography show a highly significant differences between smoker group and non –smoker group at p-values 0.000 .intra group comparison between gender show non significant difference for furcation involvement .correlation using pearson r between number of cigarettes and number of sites founded in each patients was a highly significant Conclusion: Cone-beam computed tomography imaging has the potential to replace intraoral imaging for the assessment of periodontal architecture especially in buccal and lingual aspect. However, clinical studies would be helpful in supporting this conclusion. Also Cone-beam computed tomography may be a useful and more practical clinical tool than digital subtraction radiography for the assessment of changes in periodontal bone over time

Cone-beam computed tomography as an aid in early diagnosis of furcation involvement of young age smoker and non smoker subjects (comparative study)