Abstract: A dental radiographic positioner and film holder assembly has a film plane reference component (2) configured to detachably affix to a shaft (1a) extending from the edge of the film holder (1). Affixing surfaces (1b, 2b) are provided between the shaft (1a) and film plane (2) to enable longitudinal movement and restrict rotational movement. A teeth plane reference component (3) is detachably affixed to the shaft (1a). A bisecting angle reference component (4) is detachably affixed to the shaft (1a). Both the bisecting angle plane (4) and teeth plane (3) are attached to allow for longitudinal motion along the shaft (1a) as well as rotational motion around the axis of the shaft (1a).

Abstract: A training device is shown and described. The device comprises a disk having a perimeter. A foot-interface is attached to the disk. A rolling member is positioned around the perimeter of the disk and is preferably substantially concentric with the disk.