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一、牙龈的增龄变化:老年期牙龈的最大变化是牙龈缘萎缩和牙周袋加深,以及牙龈上皮层和固有层的变化。现在认为牙龈缘萎缩和牙周袋加深是由于牙齿表面沉积增殖的口腔菌斑的慢性感染,引起的进行性破坏所致。对牙龈上皮层和固有层的变化,有人曾对600天以上高龄大白鼠的牙龈做过观察,见到上皮层和上皮颗粒层以及角化层等萎缩。在固有层可见结缔组织细胞减少。但对58—64岁老年人牙龈的观察,除去上皮细胞数减少之外,一般看不到上皮层的角化、乳头层上部厚度、上皮突起的大小以及上皮细胞的有丝分裂等与增龄有什么关系。另外,
First, the aging of the gums changes: the biggest changes in the elderly gingiva is gingival margin shrinkage and periodontal pocket deepening, and gingival epithelium and lamina propria changes. Now that the gingival margin shrinkage and periodontal pocket deepening is due to dental plaque deposition and proliferation of oral plaque chronic infection, caused by the progressive destruction. Changes in the gingival epithelium and lamina propria, some people have been more than 600 days old rat gum observed, to see the epithelium and epithelial granules and keratinized atrophy. Connective tissue cells decreased in the lamina propria. However, for the observation of the gums of the 58-64-year-olds, there is generally no observation of the keratosis of the epithelium, the thickness of the upper part of the papillary layer, the size of the epithelial protrusion, and the mitosis of epithelial cells other than the reduction in the number of epithelial cells, relationship. In addition,