I In roentgenography application, the paralleling periapical roentgenography is required as a media in order to help the film equals at the same level to teeth, while the X-rays projection stands upright (90°) to the both sides. It is useful to create a roentgenogram exactly observed from the original condition of teeth and periodontal tissues. Bisecting roentgenography needs be noticed more especially for the teeth in ma\.illa area. For the application of this type of roentgenography, scratch an imaginary line starts from pupil to insisal edge of anterior teeth, while for the bisecting roentgenography of posterior teeth in this maxilla area, scratch an imaginary line from interpupil to bucal cusp of posterior teeth. Whereas roentgenography for mandibular area is not as complicated as roentgenography for maxilla area because it can be observed exactly in plain view. The right angle for bisecting periapicalprojection for mandibular teeth is quite small approximately •3 - 5° negative.Bitewing roentgenography requires a special film complete with biteloop or bitewing tab in running this application. Roentgenogram that created from this kind of rocntgenography shows teeth in maxilla and mandibular area. The same lingual opposite buccal roentgenography is a root and root channel-location-determined rocntgenography by moving the light 20° horizontally and the result may shows that the bucal root channel moves according to the light direction in the roentgenogram. In all those roentgenography techniques which mentioned above, it is important to do radiation protection.