A dental revolution: The association between occlusion and chewing behaviour
Fig 3
Process for calculating ORI using GOM Inspect.
A) The cervical reference plane (green) is translated along the z-axis to the deepest point of the occlusal surface (red). This is typically the deepest point of the central fossa. B) The polygonal model is then cut at the level of the occlusal plane. C)The 2D area of the tooth is measured at the level of the occlusal plane. D) The 3D occlusal area is measured from the level of the occlusal plane. The occlusal relief index (ORI) is the area of D divided by the area of C.