Abstract: A sulfide gas concentration measuring device comprises: an exhaled breath collection tool to be put to a subject to introduce exhaled breath of the subject into the exhaled breath collection tool; a pressure regulator comprising an inlet port connected to the exhaled breath collection tool; a sulfide gas sensor connected to an outlet port of the pressure regulator to measure a concentration of sulfide gas in the exhaled breath discharged from the outlet port; and a pressure measuring device. The pressure measuring device is configured to measure a pressure in the inlet port of the pressure regulator to make the subject aware of the measured pressure.

Abstract: A lesion portion determining method of an infrared observing system includes at least an observing apparatus. The observing apparatus includes a light source device which radiates light of a first wavelength band including a wavelength of 805 nm and light of a second wavelength band including a wavelength longer than 805 nm, an image pick-up device which picks up an image of the first wavelength band and an image of the second wavelength band of an object irradiated by the light radiated from the light source device, display means which displays, as any color component of red, green, and blue, the image of the first wavelength band and the image of the second wavelength band that are picked-up by the image pick-up device. The lesion portion determining method includes a step of administering an infrared absorbing pigment to a patient, and a step of observing a visible range of the infrared absorbing pigment by the observing apparatus.

Abstract: A lesion portion determining method of an infrared observing system includes at least an observing apparatus. The observing apparatus includes a light source device which radiates light of a first wavelength band including a wavelength of 805 nm and light of a second wavelength band including a wavelength longer than 805 nm, an image pick-up device which picks up an image of the first wavelength band and an image of the second wavelength band of an object irradiated by the light radiated from the light source device, display means which displays, as any color component of red, green, and blue, the image of the first wavelength band and the image of the second wavelength band that are picked-up by the image pick-up device. The lesion portion determining method includes a step of administering an infrared absorbing pigment to a patient, and a step of observing a visible range of the infrared absorbing pigment by the observing apparatus.

Abstract: The object of the present invention is to provide an artificial tooth and its production method that is not required to be joined directly to the mandibula or the maxilla, and an artificial tooth and its production method that allows both homoplastic and heteroplastic transplantation. The artificial tooth of the present invention has a layer in which extracted collagen is filled into the root canal of a homoplastic or heteroplastic permanent tooth from which cellular components of periodontal ligament, nerve and blood vessel have been removed, and an extracted collagen membrane on the surface of the root having on top of it a periodontal ligament from which said cellular components have been removed.