| 摘要 |
An x-ray film positioning device wherein the film holder and x-ray beam alignment rod can rotate together while the biteblock remains stationary. Such rotation is accomplished by means of an axle placed through the body of the biteblock, or through tubes attached to the biteblock, and attaching the film holder to one end of an extension bar and attaching the other end of the extension bar to one end of the axle, and further attaching the beam alignment rod to the other end of the axle. By the configuration of this assembly, a predetermined relationship of the film to the x-ray beam e.g. parallel, can be maintained with all angles of rotation. Simultaneously, the biteblock remains stationary in a flat, occlusally parallel position, held securely between the upper and lower teeth. This rotational concept is particularly helpful, but not limited to, film holder biteblock arrangements which are laterally off-set one to the other when viewed from the x-ray source.
|
