Abstract: To provide a dental handpiece device that can suppress a case where a drilled face is in a blind spot, and thus cannot be observed, this dental handpiece device includes: a dental handpiece main body; and a dental handpiece imaging device with which the dental handpiece main body is equipped, wherein the dental handpiece imaging device includes: a plurality of camera modules each of which takes an image, to convert the image, which is taken, to an electric signal; and a processing means that receives the electric signal from each of the camera modules, to calculate for generating an image based on the electric signal, and to switch a display of the image, which is taken by each of the camera modules.

Abstract: To provide an air injection device for a dental handpiece which makes it possible to obtain a clear image even if the position of an image taking part is changed, provided is an air injection device including: a trunk connector (41) that is in a form of a column, in the trunk connector a passage being formed; an air guiding pipe (45) that is in a form of a pipe, one end of the air guiding pipe being connected to the trunk connector, the air guiding pipe having flexibility; and a means (46) that retains the air guiding pipe in the dental handpiece main body, wherein the passage in the trunk connector branches, one of the branching passages communicating with the air guiding pipedental handpiece.

Abstract: The present invention provides an occlusal pressure measuring device which makes it possible to capture the positional relation between measurement results of the occlusal pressure and the tooth row more easily and more precisely. The occlusal pressure measuring device 1 comprises: a sensor portion 10 capable of measuring occlusal pressure; and a body 20 which transmits information obtained from the sensor portion, wherein the sensor portion is a laminate of a plurality of layers; at least one of the plurality of layers is a pressure sensitive layer capable of detecting occlusal pressure; and the outermost layer of the sensor portion is a shape transfer layer which can be deformed by the occlusal pressure and can retain the deformation even when the occlusal pressure is removed.