Abstract: The present invention provides a system for embedding an artificial tooth root whereby holes of various depths can be bored into an alveolar bone more stably and kinds of drills and kinds of spacers to be included herein can be reduced. The system for embedding an artificial tooth root comprises: two kinds of dental drills to bore a hole into the alveolar bone which have predetermined different lengths and have a predetermined relation; and one to three kinds of spacers to be attached to the dental drills, for combinations of an artificial tooth root and a surgical guide, the artificial tooth root being selected from a group of artificial tooth roots formed of two to five kinds of artificial tooth roots, and the surgical guide being selected from a group of surgical guides formed of one to three kinds of surgical guides.

Abstract: A stopper Y is cylindrically formed in its entirety and inserted and attached from a top side of a blade Xc of a drill X having a flange Xa projecting at a shank Xb. The stopper has a through hole to be inserted by the blade Xc of the drill X and includes a drill blade entering depth regulating part Ya and a drill holding part Yb. The drill blade entering depth regulating part Ya has a height regulating a entering depth of the blade Xc of the drill X in a jawbone of the lost tooth part. The drill holding part Yb has a plurality of slits Yba formed along the axial direction of the stopper from an end opposite to the drill blade entering depth regulating part Ya, detachably engages to the flange Xa of the drill X, and holds the drill X by elasticity.

Abstract: A dental impression tray includes a tray body 1 and a handle portion 2. The tray body 1 has an engaging convex portion 1a on an anterior tooth part of the area corresponding to an alveolar crest thereof and a L-shaped handle portion 2 has an engaging portion 2a engaging with the engaging convex portion 1a on a top end thereof. The handle portion 2 can be detached at a time of bite taking for recording occlusal positions. As for embodiments of the engaging convex portion 1a and the engaging portion 2a, there are one embodiment in which the engaging convex portion 1a is a projection and the engaging portion 2a is a hole engaging with the projection, and another embodiment in which the engaging convex portion 1a is a dovetail projection and the engaging portion 2a is a dovetail groove engaging with the dovetail projection by sliding.