JP2013128616A - Light irradiation device for bleaching stained tooth without using bleaching medicine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To bleach the staining substance of a tooth and re-staining of a once whitened tooth by a simple operation without operation burdens of mouth opening by a mouth opener and mounting of a tray over a long period of time or the like without using a bleaching agent and without causing thermal damages on the tooth or the gums.SOLUTION: With a photolabile pigment which is the staining substance of a tooth as a target, a tooth surface is irradiated with the light of a wavelength and intensity for causing fluorescent emission which is the index of photochemical reaction for causing bleaching of the photolabile pigment by the photochemical reaction by the photolabile pigment and the light. During irradiation, an irradiation handpiece is capable of cooling the tooth surface and is capable of bleaching the tooth without causing thermal damages on the tooth or the gums. For the irradiation handpiece, aqueous gel for transmitting light and heat is applied onto a gel pad cover for transmitting the light and the heat, that covers an irradiation part without opening the mouth while changing a position to left and right and upper and lower dentitions to about the fifth tooth, it is brought into contact with the tooth surface lightly and is irradiated successively, and the tooth is bleached by a simple operation without operation burdens.

Description

  The present invention relates to a handpiece-type light irradiation device that promotes tooth bleaching, and relates to a tooth whitening technique belonging to oral aesthetics.

Patent Publication 2006-21040 Patent Publication 2003-227974

Whitening for whitening teeth with gels containing bleaching agents such as hydrogen peroxide and urea peroxide is widely performed at clinics and at home and abroad. It is also well known that bleaching is accelerated and bleached in a shorter time by irradiating the teeth coated with these bleaching agents with light of UV, blue and infrared wavelengths. The mechanism of the promotion of bleaching by light is that light promotes the oxidation reaction by coloring substances and bleaching agents. Accordingly, the higher the bleaching agent concentration and the light intensity, the more the bleaching is promoted. However, if the bleaching agent or the light intensity is too high, it may cause an oxidation reaction, pain or inflammation due to thermal action on the pulp or surrounding gingiva. In the case of irradiating light, since the light is radiated in a non-contact manner toward a mouth that is wide open using an opening device, there may be a case of pain due to opening pain or dryness in the oral cavity. It is known that a method in which a low-concentration bleach is filled in a tray suitable for a dental mold and bleached at home causes hypersensitivity and gingival inflammation at a very high frequency during a long bleaching period. On the other hand, whitening by brushing with a toothpaste that does not use a bleaching agent that removes dirt on the tooth surface does not decolorize the coloring substances inside the teeth, so the whitening effect is limited. Most of the causes of tooth coloring are porphyrin-based brown substances due to metabolism in the body and external coloring due to food and drink, etc., rarely coloring tetracycline etc. due to antibiotics and coloring due to tooth formation failure due to growth. Many porphyrin derivatives, food and drink dyes, and tetracyclines are known to be photosensitive and emit fluorescence when irradiated with light of a specific wavelength. Photochemical cancer treatments using photosensitizing dyes are widely performed in Japan and overseas. Irradiation with light of a wavelength absorbed by a photosensitive dye such as hematoporphyrin derivative administered into the body excites the electrons of the photosensitive dye, generating oxidizing substances such as hydroxy radicals, which are singlet oxygen, and oxidizing and destroying malignant cells. To do. It is well known that certain dyes fade when exposed to sunlight. It has been found that light fading, which is common in the field of dye chemistry, is due to oxidative decolorization of dyes by radicals or the like in which light absorbing dyes are singlet oxygen having a strong oxidizing action. It has also been confirmed that the addition of an antioxidant to the photo-fading stops the fading reduction so that the fading is an oxidation reaction. It is known that tooth coloring is mainly caused by porphyrin derivatives generated in the body, photosensitive antibiotics such as tetracycline, and food and drink pigments. Among food, cumin contained in curry is well known as a cause of tooth coloring. It is also known that re-coloring with pigments in these foods and drinks often occurs even with teeth that have become white. It is also known that the photochemical reaction is an oxidation reaction caused by generated hydroxyl radicals, and the oxidation reaction in solution is more acidic than alkaline.

First, by irradiating the photosensitive dye, which is a part of the coloring material of the teeth, light decolorization of the photosensitive dye is enabled.
Secondly, the irradiated part is cooled, and the coloring material of the teeth can be decolorized without causing thermal damage to the tooth surface or gums.
Thirdly, it is possible to irradiate while moving the left and right, up and down about 5th tooth row without opening to the teeth to be decolored.
Fourthly, it is possible to efficiently irradiate the tooth surface with light corresponding to changes in the shapes of the dentition, teeth and gingiva, and to transfer and cool the heat generated in the tooth surface or gingiva.
Fifth, it is possible to efficiently irradiate light on the tooth surface and to transfer heat generated in the tooth surface or gingiva to cool the tooth surface and keep the tooth surface acidic to promote decolorization by photochemical reaction.

A first invention for solving the above-described problems is that fluorescence is secondary light that is an indicator of photobleaching of a photosensitive dye by irradiating the photosensitive dye, which is a part of a tooth coloring substance, with light. This is a light irradiation device capable of generating light emission. The second invention is an irradiation apparatus that can cool the irradiating part in contact with the tooth surface in order not to cause thermal damage to the tooth surface or gingiva even by light irradiation. A third invention is a handpiece and an irradiation apparatus capable of irradiation with a light source having a wavelength suitable for the light absorption characteristics of a coloring substance that causes a photochemical reaction.
The fourth invention is a water-based material that is deformed by light compression according to the shape of the dentition, teeth and gingiva, and is covered with the irradiated part of the tip of the tooth, gingiva and handpiece, and is covered with light, and transmits light and heat from the irradiated part A gel pad cover formed of a translucent plastic film containing gel. The fifth invention is a translucent water-based gel that transmits light and heat and keeps the surface of the tooth being irradiated acidic. This gel is interposed between the gel pad and the teeth and is applied to the tooth surface before irradiation.

First, it is possible to decolorize the coloring material of the teeth without using a bleaching agent, and it is possible to whiten not only at the clinic but also at home without hypersensitivity and gingivitis. Secondly, since the irradiation part is cooled and the coloring material of the teeth is decolored while cooling the tooth surface or gingiva, comfortable whitening without thermal pain or the like becomes possible. Thirdly, the coloring material of the teeth can be decolored while sequentially moving the dentition without opening, and simple and comfortable whitening is possible with the same feeling as brushing without opening pain. Fourthly, the coloring material of the tooth can be decolored according to the shape of the dentition, teeth and gingiva, so that it can be applied to dentitions, teeth and gingiva of various shapes. Fifth, it is possible to accelerate the decolorization of the colored substance containing the photosensitive dye, so that the recoloration on the tooth surface once whitened can be decolorized.

The handpiece type light irradiating device has 1 blue LED light source and 3 temperature sensors on the tooth surface side, and is filled with 2 translucent rubber having good thermal conductivity and has confidentiality. The two circulating cooling water tubes are connected to 5 handle hoses, the LED light source is connected to 13 light source power supplies, the temperature sensor is connected to 17 temperature control devices, and the Peltier electronic cooling 18 cooler power supply is connected using 6 cable hoses. The handpiece type light irradiation apparatus has seven cooling chambers. In the cooling chamber, coolant is circulated by 16 pumps via 5 tubes. The coolant is cooled by 14 radiators and 15 fans. Eight Peltier electronic coolers are operated according to the set temperature to generate heat from the irradiation light source, coloring matter, gums, and light absorption by the teeth, and heat removal, cooling, and temperature control are performed. In addition, during the light irradiation, if the set temperature is exceeded even when the Peltier electronic cooler is activated, or if the sensor fails, the temperature control device stops the light irradiation until the temperature is lower than the set temperature. The 10 aqueous gels inside the 9 gel pad covers that are attached to cover the tip irradiation part of the handpiece that irradiates light are adjusted to a low hardness by an aqueous thickener, and have the shape of dentition, teeth, and gums. Accordingly, it has a hardness that can be deformed, adhered, and retained. Furthermore, 11 translucent water gels are interposed between 12 teeth and gums to improve the adhesion between the gel pad cover and the tooth surface, keep the tooth surface weakly alkaline, promote the oxidative decolorization reaction, and improve the irradiation efficiency and heat transfer. Improve. The treatment is performed while holding the handle holder 4 and moving the tooth surface.

<Other embodiments>
Cooling with only water cooling is possible without using a Peltier electronic cooler. The temperature of the irradiating part is set higher than the case where there is a Peltier electronic cooler, and the LED output is limited. Furthermore, air cooling is possible instead of water cooling. On the heat generating side of the Peltier element cooler, heat flow flows to the cooling side by 19 heat pipes. The 20 copper fins attached to the heat pipe are cooled by 24 outside air by the suction of 21 fans. In the case of air cooling, direct cooling by a heat pipe having no Peltier element is also possible. The air-cooling fan is linked to power activation. The light source, Peltier device electronic cooler, fan, and the like are powered and operated by 23 cables. The Peltier device electronic cooler is linked to the activation of the light source. Operation is performed by holding 22 holders.
A semiconductor laser, which is a small oscillator, may be used as the light source. In the case of a laser, the LED light source 1 is a semiconductor laser oscillator. A plurality of types of LEDs such as yellow and red may be used as the light source. In the case of a plurality of types, it is possible to deal with more coloring pigments than a single color.

Each LED has an output of 1500 mw at a blue wavelength of 450 nanometers. The four blue LEDs and the platinum temperature sensor are mounted on a mouthpiece type light irradiation device by a heat conductive adhesive. LED heat generation or tooth or gum heat generation is removed by cooling with a Peltier element electronic cooler with a maximum work of 80 watts. These LED and platinum temperature sensor are filled with translucent silicone rubber having good thermal conductivity, and the light irradiation part has waterproof confidentiality. The temperature sensor monitors the temperature reflecting the tooth surface temperature, and enables light irradiation while controlling the temperature of the tooth surface. The temperature is set to, for example, 30 degrees C so that the tooth surface temperature does not exceed the safe 42 degrees C. The LED light source, the power cable of the temperature sensor, and the sensor cable are connected to the temperature control device and the light source power source by a water-resistant tube.
The LED light source and the entire handpiece-type light irradiation device are made of aluminum having high thermal conductivity, and an internal cooling chamber cools the heat generating side of the electronic cooler. A coolant of glycerin solution is circulated in the cooling chamber. The coolant is air-cooled by a radiator and a fan. The electronic cooler and LED irradiation are turned on and off so as to maintain the set temperature by the temperature controller. The gel pack that is attached to the handpiece type light irradiation device is made of a stretchable polyethylene thin film material and has an aqueous gel compartment inside. The gel pack's gel compartment is welded and sealed to prevent leakage of the aqueous gel. The gel gel aqueous gel forms a low-hardness gel pack with a thickener such as sodium carboxymethylcellulose that transmits light. Translucent water-based gel interposed between the tooth surface and gum and gel pack keeps the tooth surface acidic and raises the dirt on the tooth surface, water and citric acid as the main components, carboxymethylcellulose, a thickener, antiseptic The agent is methylparaben, which is an agent.

It is an external view of a handpiece type light irradiation apparatus. It is a perspective view of a handpiece type light irradiation device. It is a mode that the handpiece type light irradiation apparatus was installed in the oral cavity. It is an external view of a gel pack. It is a systematic diagram of electricity and fluid for operating a handpiece type light irradiation device. It is a perspective view of the water-cooling handpiece type light irradiation apparatus which does not use a Peltier device electronic cooler. It is a perspective view of the air-cooled handpiece type light irradiation apparatus using a heat pipe. It is a perspective view of the air-cooled handpiece type light irradiation apparatus using a heat pipe and not using a Peltier device electronic cooler.

Claims (5)

A light irradiation device capable of generating fluorescent light, which is secondary light, which is an index of photobleaching of a photosensitive dye, by irradiating the photosensitive dye, which is a part of a tooth coloring material, with light The light irradiation device according to claim 1, wherein the light irradiation device is capable of cooling the heat generated in the teeth and gums by contacting the teeth and gums through a medium for transmitting light and heat from an aqueous gel or the like. The handpiece capable of irradiating light while sequentially moving with respect to the dentition up to about 5th, left and right and up and down without opening in the irradiation device of claim 2 In the irradiation device according to claim 3, it is deformed by light pressure according to the shape of the dentition, teeth and gingiva, is in close contact with the light irradiation part at the tip of the handpiece, is covered and transmits the light from the irradiation part with the teeth and gingiva. Gel pad cover containing water-based gel molded with translucent plastic film that can cool generated heat The gel pad cover according to claim 4 is interposed between the teeth and gums, transfers heat generated from the light irradiation part and in the teeth and gums that have absorbed light, and maintains the surface of the teeth acidic and decolorization by photochemical reaction. Promotes translucent water gel