JP2504245Y2 - Percussion head mechanism of dental percussion device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a percussion head mechanism of a dental percussion device that measures tooth mobility by percussion, and more specifically, to measurement by percussion mainly from the buccal side or lingual side of a molar, and The present invention relates to a percussion head mechanism that facilitates measurement by percussion from the lingual side of front teeth.

Prior art When diagnosing periodontal diseases, tooth mobility is diagnosed.This is regarded as a vibrating system composed of a spring whose mass is a tooth and includes viscous spring that supports the tooth. Diagnosis of periodontal disease from the characteristics, see the attenuation characteristics when a percussion head is abutted on the tooth and an impulse of a predetermined magnitude of force is given, for example, if the attenuation frequency is below a predetermined value, there is a disease. If the diagnosis is made and the value is above a predetermined level, it is regarded as normal. As such a dental percussion device, a rod-shaped body having a length equal to the length of the casing is coaxially supported by a casing and a spring support member having a large stiffness, in a cylindrical casing having one end opened. A percussion head is mounted on the opening side of the casing through a sensor such as a piezoelectric element, while a coil is wound around the outer periphery of the other end of the rod, and a magnet is fixed to the casing inside the rod of the coil. There is a system in which the rod-shaped body is vibrated so that the rod-shaped body is moved in the axial direction by non-contact fitting and electromagnetic action by the magnetic flux generated by the magnet and the current supplied to the coil. In this case, the percussion head has a spherical tip and a conical shape as a whole, and is in contact with the tooth at the spherical portion of the tip.At this point, a rectangular current pulse is applied to the coil to push the tooth. Then
The reaction force of the tooth is electrically converted by a sensor, and the presence or absence of periodontal disease is diagnosed from the signal waveform.

Problems In the conventional dental percussion device described above, the percussion head is brought into contact with the tooth in front of the tooth, which is convenient for diagnosing the anterior tooth, but the molar tooth is pushed laterally (buccal side or lingual side). It was unsuitable for the diagnosis of swelling and the diagnosis of pushing the front teeth from the lingual side.

Means for Solving Problems The present invention has been made to solve the above problems, and in particular, is one in which a percussion head is pressed against a tooth from the lingual side or from the side, The gist of the invention is a drive unit that vibrates with a predetermined force in the axial direction, a transmission rod that is fixed to the drive unit and that transmits force coaxially, and a percussion head that is connected to this transmission rod and pushes teeth. And a sensor which is interposed in the transmission rod and detects a reaction force generated by pushing a tooth by the pushing head and outputs an electric signal, are integrally mounted in a cylindrical casing opened by the pushing head. In a dental percussion device, a percussion head is formed into a columnar body having an arc line with a uniform outer diameter, and is connected to a transmission rod so as to be rotatable around the axis line. Loosely insert into the percussion head guide and transfer rod Is converted into the arcuate displacement of the percussion head.

Embodiment FIG. 1 is a side sectional view showing the structure of a percussion head mechanism of a dental percussion device according to the present invention. In the figure, reference numeral 1 is a driving unit, which is connected to a power source (not shown) and is applied. The electromagnetic force driven by the generated pulse current is used to generate a driving force in the direction of the axis 11. Reference numeral 3 is a transmission rod connected to the actuator of the drive unit 1, and the drive shaft 11 of the drive unit 1 and the shaft 31 of the transmission rod are on a straight line. Reference numeral 2 is a sensor that converts a force acting on the transmission rod 3 in the direction of the shaft 31 in the middle of the transmission rod 3 into an electric signal, and a piezoelectric element such as PZT is sandwiched between electrode plates, and the force signal is derived by a conductor wire not shown. However, this may be replaced with a known acceleration sensor. The above-mentioned driving unit 1, the sensor 2, and the transmission rod 3 are arranged in a cylindrical casing 10. casing
One end of 10 is open, and the length is determined so that the end of the transmission rod 3 is located in the opening 10a. Reference numeral 5 denotes a portion for struck a tooth by a percussion head, and the shape is a cylindrical body having a constant outer diameter with a shaft 51 having an arc as shown in the figure, and one end thereof is rotatably supported by a pin 6. Therefore, the axis 31 of the transmission rod 3 is tangential to the arc axis 51 of the percussion head 5 at the position of the pin 6. Further, since the percussion head 5 is required to have a dynamic response, a lightweight resin is desirable, but a lightweight metal or a partial metal may be used as long as the material has a high response and internal friction. Reference numeral 4 denotes a cylindrical body that forms an arc coaxial with the percussion head 5, one end of which is fitted into an annular step portion 10c formed on the inner peripheral surface of the opening portion 10a and the other end is open.
1 has a length such that the percussion head 5 projects from the open end 41 when the percussion head 5 is at the percussion position, and is normally inserted. Since the percussion head guide 4 guides the movement of the percussion head 5, a hard metal is used, but the inner surface has a small friction with the percussion head 5, and may be coated with Teflon or the like if necessary. desirable.

In the operation of the percussion head mechanism described above, the transmission unit 3 is moved in the direction of the predetermined distance axis 11 by a predetermined driving force by driving the drive unit 1 based on a signal from a percussion start command device (not shown). Although the percussion head 5 also moves with the movement of the transmission rod 3, since the pin 6 is pivotally supported, the percussion head 5 can be rotated around the pin 6 in an arc shape.
It moves under the guidance of the percussion head guide 4 and projects from the open end 41 along an arc axis 51. Since the open end 41 is inscribed in the tooth from the side (buccal side or lingual side) and positioned,
The percussion head 5 is pressed from the lateral (buccal side or lingual side) position with respect to the molar and from the lingual side position with respect to the anterior tooth for percussion.

FIG. 2 shows another embodiment, in which the transmission rod 3 and the percussion head 5 are connected by a joint rod 7 which is an annular pin in the configuration shown in FIG. Then, since the transmission rod 3 and the percussion rod 5 are arranged apart from each other, the percussion rod 5 can be easily rotated around the joint rod 7.

FIG. 3 shows another embodiment, in which the percussion head 5 is a spring, a wire, a resin, and a flexible arc-shaped columnar body 52 in which they are combined, and the tip is made of a resin or metal head 53. And the other end is fixed to the transmission rod 3. In this example, the percussion head 5 is an arcuate flexible column, so that the percussion head 5 can move within the percussion head guide 4 without difficulty.

Effect As is clear from the above description, according to the percussion head mechanism of the dental percussion device of the present invention, the percussion head 5 has an arc shape and can be guided by the percussion head guide 4 to rotate and perform percussion. Since the percussion position can be visually determined by the percussion head guide 4 from the buccal side or lingual side for the molars and from the lingual side for the front teeth, the push-up diagnosis can be performed.
Diagnosis of molars is possible, and even for front teeth,
It became possible to percuss from the lingual side.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view showing an embodiment of a percussion head mechanism of a dental percussion device of the present invention, and FIGS. 2 and 3 are diagrams showing other embodiments. Is. 1 ... Driving unit, 2 ... Sensor, 3 ... Transmission rod, 4 ...
… Percussion head guide, 5 …… Percussion head, 6 …… Pin,
7: Joint rod, 8: Flexible head.

Claims (3)

(57) [Scope of utility model registration request] 1. A drive unit which vibrates with a predetermined force in the axial direction, and a transmission rod which is fixed to the drive unit and transmits the force in the axial direction.
A dental percussion device having a percussion head that is connected to the transmission rod and presses a tooth, and a sensor that detects a reaction force generated when the tooth is pressed by the percussion head and outputs an electric signal. The head is composed of an arcuate columnar body, is rotatably connected to the transmission rod about an axis, and is loosely inserted in a cylindrical percussion head guide, and the linear displacement of the transmission rod is converted into an arc of the percussion head. A percussion head mechanism for a dental percussion device, which is characterized by converting into displacement. 2. The percussion head mechanism for a dental percussion device according to claim 1, wherein the transmission rod and the percussion head are connected via a pin or a joint rod. 3. The percussion head mechanism for a dental percussion device according to claim 1, wherein the percussion head is a flexible body having a columnar body fixed to the tip thereof.