Background and Aims :One of the method for studying nonmetric traits is intraoral photography pictures .The aim of this research is , Comparison of the power of the intraoral camera to a  Extraoral camera to diagnose of morphologic non metric traits.
Materials and Methods:In this diagnostic  research we selected eligible samples ,among them at least 40 were without traits and 40 had the traits. At first with intra oral camera photo was  taken. Then, we took photo with a extraoral camera with a mouth opener and a mirror in the mouth with a 45 degree angle. At the end, the images were simultaneously judged on the monitor and studied. At the end of the study, the intraoral and extraoral camera.Findings were evaluated simultaneously on the monitor and analyzed statistically using fisher test.
Results: Negative and positive diagnostic vaule of nonmetric traits in intraoral camera was 100% and extraoral traits was 100, and 68% respectively and the related difference was significant. P<0.0001)
Conclusion: Intraoral camera has more preference  than extraoral camera in diagnosis of nonmetric triats.