Color stability analysis of dental materials tested by xenon lamp aging test chamber

Xenon lamp aging test box is a light aging test instrument, which can test the light aging performance of textile materials, dental materials and many other materials. In addition, the technical research and development engineer stated that YY/T 0631-2008 specifies the method for the determination of the color stability of dental materials after exposure to light by immersion in water. Test device: Xenon lamp with medium pressure light source, the color temperature is between 5000K and 10000K. Measured according to GB16422.2, the illuminance in the sample should reach 150000lx±15000lx. Other light sources equivalent to xenon lamps may also be used. The luminous intensity of xenon lamps and UV filters will change due to aging after 1500 hours of use, so they should be replaced in time. Get a suitable illuminometer to measure the illuminance and adjust the contrast accordingly. The UV filter is made of optical glass (borosilicate glass), the transmittance of light waves below 300nm should be less than 1%, and the transmittance of light waves above 270nm should be greater than 90%. Test room: Distilled water or deionized water in a circulating water bath, the temperature is maintained at (37±5) ℃, the water surface is on the sample (10±5) mm, the sample is placed parallel to the bottom of the test chamber. Specimen holders are made of opaque material, preferably metal, and can be used to hold specimens up to 50mm in diameter. Test steps: ① Sample preparation The size of each dental material standard control sample, the sample preparation method and conditions, and the product of the control sample are specified. These standards should be used in conjunction with this standard. ②Half of the irradiated test sample is clamped with a sample clamp, or wrapped with tin or aluminum foil. For dental specimens, wrap half of the tooth vestibule with tin or aluminum foil parallel to the long axis of the tooth. Install the UV filter, put the sample into a water bath, and irradiate the sample with a xenon lamp (24±1) h. Take care to avoid shadows on the specimen. Color evaluation: Three examiners with normal color vision, orally observe any difference in color between the irradiated half of the sample and the unirradiated half and with the unirradiated sample. Examiners with normal color vision should be checked and verified by a doctor or other appropriately trained person. Colorless vision correction glasses may be worn. The comparison should be made under bright diffused sunlight that is not under direct sunlight in the north direction, or under a xenon lamp with an illuminance of 1000 lx~2000 lx or an equivalent lamp in accordance with CIED65 without any obvious color reflection. The disk-shaped sample is placed against a diffuse white background with a reflectivity of about 90%. The background is the same size as the disc, and the surrounding reflectivity is (30±5)% diffuse gray background around. Tooth-shaped sample, with reflectivity (30±5)% diffuse gray background. Let three observers observe for no more than 2s at a distance of 200mm~300mm from the sample.

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