Abstract: A bone caliper 1 of the present invention is used in implant treatment, and measures the width (bone width) between the bone surface of the alveolar bone and a guide hole or an implant hole. The bone caliper 1 of the present invention has a shape resembling a pair of scissors, and is constituted by a probe arm 2 having a rod-shaped measurement portion 22 formed at its front end and a bent arm 3 having a curved-shaped measurement portion 32 formed at its front end. A tip 33 of the measurement portion 32 is machined into a needle shape and opposes a tip 23 of the measurement portion 22. For measurement of the bone width, the rod-shaped measurement portion 22 of the probe arm 2 is inserted into a guide hole or an implant hole, and the tip 33 of the curved measurement portion 32 of the bent arm 3 is pressed against the gingiva until the tip 33 reaches the bone surface of the alveolar bone. In this state, the numerical value on a scale plate 6 pointed by a pointer 7 is read.

Abstract: A tooth moving method and appliance for securing a space for an incoming permanent tooth to arrive includes two lingual buttons to be fixed to two teeth, respectively, to spread out a space therebetween or correct a dentition therebetween. An inner wire is pivotally connected to a first lingual button at an end thereof, and a tube is loosely fitted onto the inner wire and pivotally connected to the other lingual button at an end thereof. An open coil is loosely fitted onto the tube, and a split stop is provided for adjusting the tensile force of the open coil. Thus the tensile force of the open coil is adjusted by the split stop to move at least either of the two teeth, so as to spread out the space therebetween to a desired extent.

Abstract: In a tooth moving method and appliance for securing a space for an incoming permanent tooth to erupt, there are provided two lingual buttons to be fixed to two teeth, respectively, to spread out a space therebetween or correct a dentition therebetween; an inner wire to be pivotally connected to one lingual button at an end thereof; a tube to be loosely fitted onto the inner wire and pivotally connected to the other lingual button at an end thereof; an open coil loosely fitted onto the tube; and a split stop for adjusting tensile force of the open coil, whereby tensile force of the open coil is adjusted by the split stop to move at least either of the two teeth, so as to spread out the space therebetween to a desired extent.

Abstract: A dental assist appliance for attachment of an orthodontic wire for achieving an effective correction of irregularities of the teeth or of improper dental arch for a short time. The dental assist appliance includes a base shaft member and an elastic member having one end fixed to said base shaft member and the other end formed as a sliding portion slidable along said base shaft member. Further, an orthodontic appliance using the dental assist appliance includes two dental assist appliances each having a sliding portion; and a dental orthodontic wire interposed between the sliding portions of the two dental assist appliances.