KR20150047468A - A appratus and the method for Osseo-Integrated Dental Implant stability - Google Patents

Abstract

The present invention relates to an apparatus for precisely measuring stability of an artificial tooth after implanting an osseointegrated artificial tooth and a method therefor. According to the present invention, the apparatus weakly hits a tooth root in the implanted artificial tooth without using a specifically manufactured transducer and implant to apply broadband impact, has a sensor which is not in contact with the implant, has a laser mounted inside a target area to hit the implant in order to aim the accurate target, and forms a focal point of laser light in the most proper distance for the accurate distance.

Description

Technical Field [0001] The present invention relates to an apparatus for measuring stability of an osseointegration artificial tooth,

The present invention relates to an apparatus and a method for measuring the stability of an artificial tooth placed in a bone after placing an artificial tooth in the bone.

Preliminary literature on the measurement of stability of osseointegration prostheses

[Patent Document 1] US, 5518008, (Cucchiaro et al), May 21, 1996

[Document 2] Osstell ^TM mentor Clinical manual

    Papers on the strength of artificial teeth [Literature 3] "Basic Study for Development of Implant Stability Assessment System", Bong Eun Sook, Jong Jin Kim, Dental Research, Vol 56, No 1, 2004, pp 41-57. ≪ / RTI >

An apparatus and a device that quantitatively indicate how stable the artificial teeth are embedded after the artificial teeth are placed in the bone and the osseointegration is about 1 or 2 mentioned in the Background of the Invention. The numbers on these two devices are not relevant at all, and the measurement techniques used by these two devices are slightly different.

    The method used in Document 1 is to measure the frequency at which the artificial tooth vibrates by applying a physical impact to the artificial tooth, as described in Document 3. This method is the most commonly used method in vibration measurement engineering (referred to in Article 3), and it is a method of measuring the resonance frequency inside the object by applying the broadband vibration impact.

    However, the invention of Document 1 has a problem that it is difficult to measure an accurate value by changing the internal resonance frequency of the artificial tooth due to the vibration value measured due to the contact of the instrument with the artificial tooth portion by measuring the frequency by measuring the sensor portion in contact with the artificial tooth portion.

    The method used in Document 2 is a method developed by Ostel to measure the vibration value, and the sensor portion is approximated to a self-transducer developed by Ostel to diverge the magnetic field to forcibly bend the magnetic field, And the next frequency is measured using a small microphone.

    The problem with this device is that it is not easy to connect the transducer precisely and uniformly to the artificial teeth. If too much force is applied, it may destroy the bone adhesion state, change the shape of internal threads of the artificial teeth, or cause deformation of the transducer itself, and if it is too weak, accurate vibration does not occur.

    Also, since the transducer always warps to a certain degree, it will always bend constantly without impacting the broadband, so that the distance between the measuring device and the transducer is different depending on the person who uses it. In this case, there is a problem that the degree of warp of the transducer is different, and the measured frequency value is different even if the same artificial tooth is targeted.

The present invention does not use a specially manufactured transducer for already placed artificial teeth, applies a weak impact to the root and implant to give a broadband impact, does not touch the implant, For this purpose, the laser is mounted inside the implant striking part, and the laser light focuses at the most appropriate distance for the correct distance.

 The present invention

1. Since the transducer is not used for specially designed artificial teeth, the sensor does not come into contact with the implant.

2. To apply a weak impact to the roots and implants in order to impact the broadband, and since the digital board transmits a constant current to the actuator for a certain period of time, the force of the impact is always constant and the acquired data is stable.

3. Use a laser to aim at the subject and match the focus to a certain distance so you always get a steady air-vibration signal.

4. Since the obtained signal is input and calculated using the Radial Basis Function (RBF), which is a type of machine learning method, the calculation result is accurate even if the input signal includes a lot of noise.

5. It shows calculation result by itself and also transmits calculation result to smartphone by using Bluetooth and installs application program (app) that can be used in smart phone and stores calculation result (database) This is possible.

1 shows the overall configuration of the present invention.
2 shows a configuration of a board for processing digital data among internal configurations of the present invention.
3 shows a signal relationship between the digital data processing board and the configuration module.
4 shows the configuration of the actuator.
5 schematically shows the internal structure of the striking rod.
Figure 6 shows the structure of the piece in contact with the frontmost implant of the striking rod.
7 shows the software configuration of the digital processing board.
FIG. 8 shows an actual photograph of the instrument for measuring the stability of the artificial attachment of bone according to the present invention, and the respective constituent parts.

FIG. 1 is a perspective view showing the entire structure of the present invention. FIG. 1 is a perspective view of a stent of the present invention, showing a stent 4 in contact with the implant 5, a microphone 6 for measuring vibration energy generated when the implant 5 vibrates, A digital processing board 2 for applying power to the actuator 1 to acquire and calculate a signal from the microphone 6, a calculation result of the digital processing board 2 And a power supply unit 3. The display unit 8 includes a display unit 8 and a power supply unit 3. In addition, the digital processing board 2 is equipped with a Bluetooth module 9 for communication with other external devices 7.

    2 shows an internal configuration of the digital processing board 2 for processing an electronic signal. An internal configuration includes an amplifier 21 for amplifying a vibration signal input from the microphone 6, an A / D converter 22 for converting a signal from the amplifier into digital data, A digital calculation board 23 and a Bluetooth module 9 for communication with the outside and the digital processing board 2 is connected to the display 8, the actuator 1, the power source 3 ), The striking rod (4)

    3 is a diagram showing a relationship between an actuator for driving the digital board and the striking rod, a laser inserted in the striking rod, and a microphone for collecting an external vibration signal. That is, when the user presses the external toggle switch once to hit the power source 72 with the power source 72 applied, the power source 67 is applied from the switch in the digital board to the laser, and the laser targets the external hit object. When the external toggle switch is pressed again, the actuator is not powered (66) and the actuator is driven. The driven actuator moves the impact rod (stick) to the left and right to strike the target. At the same time, the switch drives the amplifier (73) and simultaneously powers the microphone (68). When the air is vibrated by the vibration of the striking rod after the striking rod is hit, the vibration of the air is converted into a signal by the microphone and input to the amplifier 69. The signal is amplified by the amplifier and input to the A / D converter 70. The external signal converted into digital data by the A / D converter is input to the digital board (71). After hitting, the laser power is turned off.

    4 shows the configuration of the actuator. The actuator of the present invention has an inner cylindrical shape, a shaft 12 made of a precise metal on the outside, and a coil 13 wound around the shaft. And a striking rod 11 which reciprocates around the axis when power is applied or removed.

    Fig. 5 shows the structure of the striking rod 4 of the present invention. The material of the striking rod 4 is made of a heavy material such as metal to keep the inertia of the striking rod 4 when the actuator 4 is operated. And a hole 42 is formed on the actuator 1 side of the striking rod so that the power line can enter the inside. The tip 44 is in contact with the implant 5 and can be replaced at any time.

    Fig. 6 shows the structure of the tip 44. Fig. The tip (44) is in direct contact with the implant (5). That is, it can be replaced with a new one through the portion 443 to be fitted in the striking rod 4. The tip of the tip 44 has a hole and is covered with a transparent plastic 441 inside. This is to prevent the blood of the patient from flowing into the inside of the striking bar 4 at the same time as using the transparent rod 4, so that the laser beam at the entrance of the striking rod 4 can be emitted to the outside.

    7 is a software stack structure built in a fresh ROM inside a digital processing board. The software stack structure includes the microphone 6, the amplifier 21, the A / D converter 22, the digital calculation board 23, (9). The process is received from the microphone 6 of the device and input to the digital operation board 23 via the A / D converter 22.

    The software is run on the operating system 122 layer and the application program 123 on the operating system 122. In addition, it is possible to operate with only the device driver that adjusts each hardware without the operating system 122. And a loader 121 so that various parameters used in the application program 123 can be exchanged from the outside. The application program 123 may transmit the data to the external device 114 through the communication functions such as the USB 101 and the Bluetooth 113 if necessary. The parameters of the application program 123 may be transferred (129, 130) from the external device such as a computer to the device via the USB 101, the Bluetooth module 9, and the like. In this case, the parameter is transferred to the application program 123 by the loader 121. The application program 123 calculates the stability of the implant 5 using the signal transmitted from the microphone 6, and then transmits the final result to the display 8.

    The digital data that has been changed in FIG. 3 has two steps in order to calculate the stability value. First, the necessary feature points are extracted from the digital data. Second, the extracted data is calculated using the Radial Basis Network method. In other words, the parameter used in the RBF is obtained by collecting data on various implants (at least 1,000 cases or more), and then using the data, parameters of the RBF are generated.

     The feature point extraction in the present invention extracts a plurality of data from one digital data and extracts 41 pieces. In addition, the number can be reduced or increased. This is because the signal range varies depending on the weight of the impact rod, the physical properties of the impact rod, and the impact strength of the actuator, so that the determination ability of the stability of the implanted implant is maximized.

    In the present invention, when one signal is input, the signal is changed to a frequency domain signal intensity by Fast Fourier Transform (FFT), and the frequency domain is set to 0-1800 Hz, 1801-3500 Hz, 3501-5000 Hz, 5001-8333 Hz , 8334-11666 Hz, 11667-1500 Hz, 15000 Hz - 20000 Hz, 7 frequency regions, and one or two signals having the greatest signal strength are selected as shown in Table 1 in this region. In total, twelve specific frequencies are selected.

    Next, the Shorttime Fourier Transform (SFTF) is calculated for each selected frequency to calculate the frequency value, the signal strength when the signal is the maximum, and the strength of the signal when the signal is the second maximum, do. That is, three data items are selected for each frequency.

    That is, the time from the start of the signal to the maximum signal, the time from the signal maximum to the minimum, the time from the lowest signal to the second highest signal, the time from the second highest signal to the signal extinction And the time taken from the original signal to the maximum are used as data.

    Next, we make the universal approximation using RBF. When the input is x, the RBF function with output y is

로 표시된다. 이때 히든 노드의 개수가 k 라고 가정하고, 이 k는 사용자가 임의로 가장 최적인 것을 찾아야 한다. 각 u _i 는 각 군집의 평균이다, 또한,

는 Radial 함수로 여러 가지 kernel 함수가 있지만, 보통 Gaussian 함수를 많이 사용한다, w _i 는 각 군집의 가중치이다.

. Assuming that the number of hidden nodes is k, the user should find the most optimal one. Each u _i is the average of each cluster,

Is a Radial function that has several kernel functions, but usually uses a lot of Gaussian functions, w _i is the weight of each cluster.

u _i , w _i are determined by collecting a large amount of data (1000 squares or more). When the parameter is determined, the input data is made into 41 data by the method described above, and this data is x, and x is 41 Dimensional vector. At this time, y is the stability of the implanted implant.

(How it works)

    8, the on / off switch is turned on when the power source is fully charged, and the tip 44 at the end of the striking rod 4 approaches the vicinity of the implant 5. When the distance between the tip of the tip 44 and the implant 5 is close to the direction of the center of the implant and the switch of the striking rod 4 is pressed, ) Is turned on. When the center of the laser beam 43 is focused on the object and the object is adjusted forward or backward until the focus is adjusted, the whole of the impact rod 4 is automatically moved forward to hit the implant 5 after a predetermined time.

    3). The digital processing board is operated to supply power (67 in Fig. 3) to the laser, supply power to the next actuator (66 in Fig. 3) 6), and waits for a signal (69 in FIG. 3). Then, this signal is supplied to the A / D converter 111 and finally to the digital processing board via the amplifier, .

The device, which consists of a striking rod, an actuator, a digital processing board, a microphone, a display and a power supply, should be shaped and easy to use by the dentist. For example, a design using a component device is shown in FIG. The design of Fig. 8 shows a power switch for driving the device and a switch for driving the striking bar.

frequency
range Start ~ 1800 1801 to 3500 3501-5000 5001-8333 8334 to 11666 11667 ~ 15000 15000 ~ amount
One One One 2 2 2 Three

 The present invention relates to a device and a device that quantitatively indicate how stable the insertion of the artificial tooth is, after implanting the artificial tooth into the bone, and it is applicable to the device and its implementation method used in the dental clinic in the dental hospital. Do.

Claims (10)

An apparatus for measuring the stability of an artificial tooth after an osseointegration artificial tooth is placed,
The impaction rod in contact with the implant,
An actuator for driving the striking rod,
A microphone for measuring a vibration signal generated when the implant vibrates,
A digital processing board for applying power to the actuator, acquiring and calculating signals from the microprocessor,
And a display and a power unit for displaying the stability of the implant as a result of processing the digital processing board. The apparatus of claim 1, further comprising a laser light source inside the striking rod,
Wherein the portion in contact with the implant comprises a tip,
Wherein the tip can be replaced at any time. The tip of the tip is provided with a hole at the front side thereof and the inside of the hole is closed with a transparent material to prevent the body fluid of the patient from flowing into the inside of the impact rod. At the same time, And the laser light at the entrance side is allowed to come out. The stapler according to claim 1, wherein the actuator comprises a shaft of a metal material and a coil wound around the shaft, the staple being reciprocated around the shaft when power is applied or removed, . The digital processing board according to claim 1, further comprising: an amplifier for amplifying the vibration signal input from the microprocessor;
An analog to digital (A / D) converter for converting signals from the amplifier to digital data,
A digital operation board for processing and calculating the converted digital data, and a wired or wireless module such as a USB or a Bluetooth for communication with the outside. The digital processing board according to claim 5, wherein the digital processing board receives an application program for transferring the stability of the implant calculated using signals transmitted from the micro to the display and various parameters used in the application program from outside the measurement device And a loader for transmitting the load to the application program. A method for measuring the stability of an artificial tooth after an osseointegration artificial tooth is placed,
A step of automatically moving the staple bar forward after a predetermined time by focusing the laser beam and the implant, and striking the implant,
Measuring a vibration signal generated when the implant vibrates through a microphone,
The digital processing board acquiring the vibration signal to calculate the stability of the implant,
And displaying the result of the stability on a display. The method according to claim 7, wherein the step of calculating the stability is performed using an RBF function.
RBF function formula:

k: Assuming that the number of hidden nodes is k,
w _i : weight of each cluster
u _i : average value of each cluster

: kernel function (Gaussian function) The method according to claim 7, wherein the step of transmitting the stability result to the display includes transmitting the result through a wired / wireless interface such as USB or Bluetooth. A computerized recording medium recording the method for measuring the stability of the artificial tooth after placement of the osseointegration artificial tooth according to any one of claims 7 to 9.

Images