A mount device for a dental implant to place a fixture having an inner hole in an alveolar bone includes a mount screw having a body portion with a first screw portion and a second screw portion, and a head portion having a sectional area larger than that of the body portion, coupled to an upper end portion of the body portion, and detachably coupled to a handpiece through a handpiece connector, and a mount having an inclined surface formed on either an inner wall or an outer wall of the lower end portion for a conical connection to the upper end portion of the fixture, an insertion hole formed inside the mount along a lengthwise direction, and a second inner screw portion formed on an inner wall of the insertion hole and capable of screw coupling to the second screw portion. To remove a screw coupling between the second inner screw portion and the second screw portion when an upper end surface of the mount contacts a lower end surface of the head portion, a distance from a lower end of the second inner screw portion to the upper end of the mount is less than a distance from an upper end of the second screw portion to a lower end of the head portion.
