No abstract

Objectives: To assess accuracy and reliability of linear measurements for analysis of CBCT superimposition and determine if linear measurements are enough without requiring advanced analytical tools. Methods: Pre and post-operative CBCT scans of 20 orthodontic cases were used for CBCT superimposition. The gold standard was linear CBCT measurements on the axial section of each separate scan (pre and post) before superimposition. Voxel based and point based superimposition were done using Dolphin 3D (Dolphin Imaging and Management,

Aim: To compare the accuracy of 3D superimposed models produced by two programs using voxel based superimposition in follow up of orthodontic cases. Patients and methods: The study included 21 non-growing patients performing orthodontic treatment. The gold standard was obtained by tracing each CBCT scan then recording linear measurements between evaluation points. T1 pre-treatment and T2 post-treatment scans were fused forming 3D superimposed model using two software programs; In Vivo (Anatomage, San Jose, California, USA), and Ondemand 3D (Ondemand 3D; Cybermed Co., Seoul, Korea). Accuracy as well as inter-observer reliability between three trained observers were calculated. Results: Cronbach's alpha test showed significant low accuracy of superimposed models performed by In Vivo on canine and premolar readings and those obtained by Ondemand 3D showed significant low accuracy in canine readings. Cronbach's alpha test showed significant moderate inter-observer reliability in canine readings and significant low inter-observer reliability in molar readings performed by InVivo. While inter-observer reliability of on demand 3D was significantly moderate in molar and canine readings. Conclusion: Statistical results showed low accuracy of 3D superimposed models performed by InVivo and Ondemand. In OnDemand showed higher inter observe reliability than InVivo.

No abstract

Objectives:The purpose of this study is to validate different mastoid osteometric measurements in sex estimation in a sample of Egyptian population using cone beam computed tomography. Study design:This study was conducted on 100 cone beam computed topographic scans, with age range was from 18 to 80 years. Scans were analyzed using On Demand software. Nine osteometric measurements were used for discrimination. They all were done for both sides then averaged.Results: Males group showed higher means in all parameters. There was highly statistically significant difference between the two groups (p<0.01) except for mastoid length and mastoid medial convergence angle (p>0.05). The best of the calculated functions was obtained by mastoid height and the inter-mastoidale distance. Mastoid height showed the highest canonical correlation (0.548) and 72% classification accuracy followed by inter-mastoidal distance which showed (0.417) canonical correlation and the highest classification accuracy 82%. On the other hand, the function obtained by the mastoid length and mastoid medial convergence angle proved to be the least efficient (58%, 36%).Conclusions: Mastoid bone could be efficiently used in sex discrimination via un-identified bone remains and is preferable in forensic medicine and anthropology. Mastoid height and Intermastoidale distance are the most efficient discriminants with high accuracy. A discriminant function equation specific for the studied Egyptian population has been derived from the mastoid variables. We can conclude that mastoid bone osteometric measurements are efficient for human sex discrimination. This will give the society a clue to solve many criminal conditions.