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Background. Cone beam computed tomography (CBCT) can provide precise assistance in odontometric measurements and to investigate the existence of sexual dimorphism in population. Aim of this study was to evaluate odontometric linear measurements obtained from CBCT software including mesiodistal, tooth length dimensions and enamel thickness of the mandibular canine and mandibular first molar and arch measurements for sexual dimorphism in Egyptian population sample. Material and Methods:The study was carried out on 100 subjects who visited the department of oral and maxillofacial radiology, Fayoum University for dental treatments. The study sample were grouped into two groups, group A (50 males) and group B (50 females) aged between 18-25 years old. CBCT examination was performed for all patients. The teeth which were selected for linear measurements using CBCT in the present study were 100 mandibular permanent canines (Lower 3) and 100 mandibular permanent 1st molar teeth (Lower 6), for each group respectively. The linear measurements were taken on crown width and height, Enamel thickness, arch depth and width.Results: There was a highly significant difference between Male and Female for odontometric measurements of mandibular right and left canines and 1st molars including (CWL3, CLL3, CWL6 at contact level, CWL6 at CEJ level and CLL6) while enamel thickness measurements showed nonsignificant differences between males and females including (ETL3 at cusp tip, ETML6, ETDL6 and ETL6 at mesio-lingual cusp tip). Arch measurements including (ICW, IMW through fossa and IMW through contact) showed high significant differences between males and females. ADD measurements revealed non-significant differences between both sexes, whereas the ADM values in females were larger than males with high significant differences. Conclusion:Odontometric parameters including mandibular canine, mandibular first molar crown width and length, inter-canine width and inter-molar width measurements based on CBCT imaging show highly significant gender difference. Thus, the parameters can be simple and reliable sexual dimorphism for medicolegal purpose and also it should be considered as part of the clinical diagnosis of orthodontic treatment and estimate of orthodontic clinical need in Egyptian population.

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Aims: the purpose of this study was to evaluate the validity of specially designed computer assisted learning (CAL) Visual Basic program containing images with multiple choice questions (MCQ) for learning the basics of CT and CBCT compared to lecture supplemented with PowerPoint presentation only. Methodology:The software contained one hundred images obtained from textbooks and internet web sites, the images included the basic principles of CT and CBCT, normal anatomical landmarks, caries, periapical granuloma, cyst and tumor interpretation. 30 postgraduate internship students' participated and divided into two groups after attending a guiding lecture about the cone beam computed tomography including the study images, group I were given the program CD while group II were allowed to review the lecture only. After 2 weeks, both groups had OSPE exam.Results: it showed statistically significant mean student's score in group I receiving the program CD after lecture compared to the other group II (traditional method only) Conclusion: The use of CAL Visual Basic program enhances the learning of the basics of CBCT