JPS6012055B2 - Handpiece of caries detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a handpiece for a dental caries determination device.

Conventionally, the degree of removal of carious areas during dental caries treatment has been determined based on the sensory judgment of the dentist in charge.

In this case, if the carious area is not removed sufficiently, remineralization will not occur even if treatment is applied to the tooth, and the caries will progress, and the treatment will not be effective and the dental caries condition will deteriorate. The condition worsens and may even lead to tooth extraction. On the other hand, if you remove more of the carious area than necessary, you will end up removing the healthy part of the tooth, which will damage the strength of the tooth.Press the extract roller against the softened dentin in the carious area of the tooth. It was discovered that the dentin is penetrated and a traction force is generated when it is pulled out.

This traction force is called tag back. The present inventor focused on this point and said, ``When treating cavities, the size of tag back is measured with an instrument to determine the presence or absence of softened dentin, and by blocking this determination and removing the affected area, The inventors discovered that it is possible to accurately remove only the softened dentin without damaging the healthy part of the tooth. Although we have succeeded in developing a caries evaluator, the nine-piece of this evaluator is the subject of the present invention.In other words, this caries evaluator consists of a hand piece, which is the part that the operator holds and operates. As mentioned above, the present invention particularly relates to the band piece.Several embodiments of the present invention will be described in detail with reference to the accompanying drawings. do.

Figure 1 is a schematic explanatory diagram of one example of the band piece of the cavities detector of the present invention.

The hand piece of the caries evaluator shown in Figure 1 has a shape and structure that allows it to be easily used by a dentist in the same manner as when handling an explorer. The handpiece of this caries evaluator consists of a measuring section and a holder section.

The measuring section consists of the stylus fin at the tip of the stylus and the stalk fin of the stylus at the rear thereof.The stylus is connected to the stylus 281 via the joint Tsuru crab as shown in Figure 9.

The stylus electric g and the joint part 3 are collectively referred to as the stylus part kameha. The holder section corresponds to the handle of a well-known extractor, and is equipped with a pressure sensor 24 inside, and a pressure indicator such as a pressure indicator light 24 (for example, an LED indicator lamp) on its surface. This is a non-slip part that stops the hand from slipping.Next, each part of the hand piece wing crab of the axis determination device will be explained in detail.

The meter-reading section 201 in the measuring section 14 rises upward and then curves downward, and the vicinity of the tip of the curve hangs vertically, and a stylus 19 is attached to the tip.

In general, the peripheral wall of the depression in the carious area 63 (Fig. 8) of a tooth has an inclination of approximately 30 degrees with respect to the center of the tooth. In order to prevent the peace force Q from touching any area other than the caries measurement area in the oral cavity, the joint part 38' that connects the needle detection part 2Q and the stylus 1 is connected to the stylus part as shown in FIG. It is preferable that the joint part 38G has a uniform taper of about 30 degrees or less with respect to the center line. has
At the end of the pond, there is an iron shed hole that can compete with the meter reading section 201.

The outer shape of the joint portion 30 is preferably a cylindrical shape with a tapered portion near the tip or a prismatic shape with an radius. It is preferable to attach the joint part SQ to the tip of the needle detection part 20 using an adhesive. The stylus arm 9 is made of an inorganic or organic hard material, preferably of a very hard material such as diamond, ruby or sapphire.

By using such a hard material, wear (wear) can be prevented, and measurement errors caused by wear can therefore be suppressed to a minimum. An example of the stylus 19 is shown in Figure IQ-IQ. This stylus is made by polishing its tip into a conical shape against a diamond in the form of a column (approximately 0.8 mm long) with a square cross section (approximately 0.2 mm long on each side). It is formed by attaching a bevel to the top 34 of the part 32.The inner angle of the conical part 32 of the stylus is approximately 40 mm.
-80 degrees (e.g. about 50 degrees), R of top 34 is 0.2
-20 mils (e.g. about 0.

? Mill) is preferred. A polishing finish is applied to the surface near the top three turtles (for example, within a range of about 0.03 ribs from the top). Since the surface of the conical portion 32, that is, the tapered surface, directly contacts the softened dentin of the tooth, the degree of caries (surface roughness) of this tapered surface has a large effect on the measurement accuracy of this caries determiner. In the case of a diamond stylus, the surface roughness within the micron range (for example, 0
．． A roughness within the range of 0.02-0.3 microns is generally preferred. The stylus 19 in the hand piece 101 of the caries evaluator is placed at a location P on the extension C' of the center line C of the holder section 16 or above it, as shown in FIG. It is advantageous to set the stylus 19 so that the lower end of the stylus 19 is located, because the measurement accuracy of this caries determiner is generally the best when the stylus 19 is positioned as described above.

The Z holder section 16 can be formed according to conventional methods, but it is necessary to carry out wiring operations therein for the electric wires 1 and 43 for the pressure sensor 22 and the pressure indicator light 24. However, this wiring operation is well-known in the electrical field. Since this can be done using wiring technology, detailed explanation thereof will be omitted.Furthermore,
It is preferable that the rear end of the meter reading section 20 be removably connected to the sensor base 51 in the holder section 16 at the joint 15.
0 can be easily replaced and disinfected.

This joint 15 can be formed using any known joining means, some examples of which are shown in FIGS. 2-6. The connection section shown in FIG. 2 is an example in which the meter reading section 20 and the sensor base 51 in the holder section 16 are connected by screw competition. The connection shown in FIG. 3 is constructed to be bonded using a relatively weak adhesive. The connection portions shown in FIGS. 4 and 5 are of a type that is connected using a set screw. That is, in FIG. 4, a fitting hole 55 is provided at the tip of the sensor base 51, and a hole is inserted at a certain distance from the end surface of the fitting part 53 when the fitting part 53 of the meter-reading part 20 is fitted with iron. A flange 59 with a larger outer diameter than the iron part hole 53 is provided, and the end face 54 of the flange allows for positioning when installing the meter-detecting part.A drawing showing a connection example in which there is no angle tilting (clack) and easy installation. 5 is a connection example in which the flange portion 54 is removed from the connection example shown in FIG. 4, and the end surface of the joint portion 53 of the meter-reading portion 20 is butted against the bottom of the iron fitting hole 55 of the sensor base 51 for positioning. The connecting portion shown in FIG. 6 is configured to be connected and fixed by threading the inner wall or attaching a ring 61.Next, the handpiece of this caries determination device is 10 convenience methods will be explained.

First, the stylus 19 at the tip is pressed against the softened dentin of the carious tooth. At this time, in order to apply a predetermined pressure (for example, a pressure of about 20 M/m) accurately, regardless of individual differences, this pressure is applied. When the pressing force is reached, the pressure sensor 22 detects this and the pressure indicator light 24 lights up. When this pressure is reached, the stylus 19 is immediately withdrawn. Since tag back occurs due to this pull-out, the pressure sensor 22 of that size detects the tag back, and the value is displayed by an appropriate display means (not shown). For example, by electrically connecting the hand piece 101 of the caries evaluator to an amplifier (not shown) and an oscillograph (not shown), the magnitude of tagback can be displayed on the oscillograph. If tagback is detected through this measurement, the affected area is slightly removed and then measured again.
Measurement and removal of the affected area are repeated in this manner, and when tag back is no longer observed, that is when the removal of the softened dentin is complete. As described above, by using this caries determination device, the presence or absence of softened dentin can be easily and accurately determined without individual differences, and is extremely useful in dental caries treatment. Another example of the handpiece of the caries evaluator is shown below.
Shown in Figure 2.

The handpiece 70 of this caries determination device differs from the handpiece 10 shown in FIG. Preferably, the hand piece 70 is also configured such that the stylus turtle 9 and the needle sensing portion 20 can be removed near the locations 36 and 38, respectively. Although some specific examples of the present invention are described in detail in this specification, as can be easily understood, the present invention can be implemented in various embodiments.

5

[Brief explanation of drawings]

FIG. 1 shows one of the handpieces of the caries determination device according to the present invention.
FIG. 2 is a schematic explanatory diagram of an example. 2 to 6 are schematic explanatory diagrams 0 showing some specific examples of joints in the hand piece of the caries evaluator shown in FIG. 1. FIG. 8 is an enlarged explanatory diagram of the detection section of the handpiece of the determiner.
FIG. 3 is an explanatory diagram showing the angular relationship between the taper angle of the stylus at the tip of the handpiece of the caries determiner shown in the figure and the joint portion thereof, and the peripheral wall of the carious portion of the tooth. FIG. 9 is a schematic cross-sectional view of the joint portion. Figures 10 and 11 are schematic front and bottom views, respectively, of one example of a stylus.
FIG. 12 is a schematic side view of another specific example of the handpiece of the dental caries determination device according to the present invention. lo and 70...
Hand piece of caries determiner, 14... Measuring section, 15... Joint part, 16... Holder section,
17, 18...Stylus portion, 19...Stylus, 20...Meter sensing portion ~ 22...Pressure sensor, 24...Pressure indicator light, 2
6... Anti-slip part, 30... Joint part, 32
...Conical part, 34...Top part, 41 and 43...Electric wire, 51...Sensor base, 53...Conflict part, 54...
...Flange part, 55... Competitive hole, 57... Set screw, 59... Flange, 61... Ring, 63... Tooth caries part, C... Center line of holder section, C'... An extension of the center line, P...a location on the extension line. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 8 Figure 9 Figure 10 Festival 1 Figure 12

Claims (1)

[Claims] 1. The presence of softened dentin can be determined by pressing a stylus against the softened dentin in the carious area of a tooth with a predetermined pressure and then measuring the tag back that occurs when the stylus is pulled out. A hand piece of a caries evaluator for determining the presence or absence of caries, which has a measuring section having a curved structure suitable for being inserted into the oral cavity for measurement, and a long-handled holder section connected to the rear end of the measuring section. 1. A handpiece for a caries determination device, comprising a needle-reading portion having a curved structure and a stylus attached to the tip thereof, and further comprising a pressure sensor and pressure display means. 2. The handpiece of the caries determiner according to claim 1, characterized in that a pressure sensor and a pressure display means are provided in the holder section. 3. The handpiece of the caries determination device according to claim 1, wherein the stylus is made of a hard material. 4. Caries determination according to claim 1, characterized in that the tip of the stylus and its surrounding surface are finished with a roughness within the range of microns (represented by the difference in height of surface irregularities). Instrument handpiece. 5. The handpiece of the caries determiner according to claim 1, wherein the stylus is in the shape of a column having a conical tip. 6. The handpiece of the caries determination device according to claim 1, wherein the included angle of the conical tip of the stylus is within the range of 40 to 80 degrees. 7. The handpiece of the caries determination device according to claim 1, wherein the tip of the joint portion that connects the stylus and the needle-reading portion and the vicinity thereof are tapered. 8. The handpiece of the caries determination device according to claim 1, wherein the stylus portion is detachably attached. 9. The handpiece of the caries determiner according to claim 1, wherein the needle-reading section of the measuring section is detachably connected to the holder section. 10. The handpiece of the caries determiner according to claim 1, wherein the pressure display means is a pressure display lamp, for example, an LED display lamp.