 Placing the photographic film or sensor outside the mouth, on the opposite side of the head from the X-ray source, produces an extra-oral radiographic view.A lateral cephalogram is used to evaluate dentofacial proportions and clarify the anatomic basis for a malocclusion, and an antero-posterior radiograph provides a face-forward view.Lateral cephalometric radiography (LCR) is a standardized and reproducible form of skull radiography taken from the side of the face with precise positioning.