Cone Beam Computed Tomography produces distortion-free and accurate images of the craniofacial anatomy,\r\nand can be considered as a useful instrument to perform a correct diagnosis and treatment using a cephalometric\r\nanalysis. Now a days the 3D cephalometric analysis are made by adapting on 3D what was born on 2D, so it can be\r\nnecessary to find a new technique that was born directly on 3D.\r\n\r\nSixty-five Ricketts� first skeletal classes were chosen in an archive of 700 CBCT acquisitions. 3 easily repeatable\r\nreference planes were found on each case and then 15 points were selected on the skull, for a total of 18 cephalometric\r\npoints. Each point of these 65 patients creates a cloud of points that could represent the range of normality in the 3D\r\nspace. The coordinates of each analyzed point presented a standard deviation between 0, 00 and 5, 64. This range\r\nof values may be considered representative for the first skeletal class.\r\n\r\nAuthors agree that further studies are needed but the Direct 3D cephalometric analysis may be considered a new\r\neasy, precise and rapid way to reach a correct diagnosis and treatment with a cephalometric analysis born directly\r\non 3D.
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