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人们普遍认为年轻人易患龋齿,中年以后龋齿发生率下降。但老年人牙釉质的抗龋能力是否强于年轻人,尚不清楚。本研究用人工龋方法对老年人双尖牙和年轻人新萌出的双尖牙进行了比较。选用正畸拔除的恒双尖牙和65岁以上老年人牙周病拔除的双尖牙各为一组。每组10个牙齿。将牙齿放在含10％凝胶,pH4.0;氟离子浓度0.45ppm的人工龋液中作用10周。形成人工龋后在偏光显微镜下观察,比较龋损区的深度和结构。用离子选择电极法测釉质含氟量。
It is generally believed that young people susceptible to dental caries, dental caries declines after middle age. However, it is unclear whether the age-old enamel has stronger anti-caries ability than young people. In this study, we compared the new adventitial teeth of the bicuspids and young people in the elderly with artificial caries method. The use of orthodontic removal of permanent bicuspid and the elderly over the age of 65 extracted from the periodontal disease of the canines as a group. 10 teeth per group The teeth were placed in artificial caries containing 10% gel, pH 4.0; fluoride ion concentration 0.45 ppm for 10 weeks. After the formation of artificial caries observed under a polarizing microscope to compare the depth and structure of carious lesions. Determination of fluorine content in enamel by ion selective electrode method.