The present invention discloses a method of predicting a blood pressure trend by blood pressure measurements, and the method allows users to select a number of times for measuring blood pressures as a cycle according to a doctor’s recommendation or a personal preference, and automatically calculates and stores an average of blood pressures of the cycle. A guide jig for guiding a cutting bar attached to a handpiece when forming an implant cavity at an implantation position of an implant is configured to include a handle section formed of an elongated fashion, a pole section that supports an end side of the handle section and a guide section that guides the cutting bar on the end side of the handle section. Thus, lengths of the wirings for transmitting the clock signal to the plurality of circuits are adjustable while the entire length of the wirings is minimized.