MAXILLARY INCISORS

Adjust the head as described for radiography of maxillary teeth. Gently contour both long borders of the film slightly in the direction of the curvature of the palate. Place the film packet in the mouth so that its long borders are vertical and its center is in line with the median plane of the upper arch. Have the lower border of the packet slightly below (approximately 1/8 inch) and parallel to the incisal edges. Adjust the tube to an average angulation of +40º. Direct the central ray to pass through the tip of the nose in line with the median plane and perpendicular to the bisecting plane (see figure 4-13). Follow the manufacturer's instruction for exposure times.