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增龄引起器官组织的变化不是疾病,而是生理过程。釉质、牙本质和牙骨质有极少的或者没有血管形成,主要靠弥散给予滋养。1960年Biirger把老年人的硬组织的退化影响,概括为“超矿化作用”(trasmineralization)。牙齿增龄的大体改变颜色:主要从50岁起,牙齿呈黄色或黄棕色,始于牙根延至牙冠。1978年Rateitschak等人认为这种变化的原因是1.牙本质和牙骨质的厚度增加;2.牙齿的硬组织变形,伴有光学性质的改变;3.变色物质沉积在表面粗糙部位;4.沉积于咀嚼功能和口腔卫生差的牙上。
Aging caused by organ tissue changes is not a disease, but the physiological process. Enamel, dentin and cementum with little or no blood vessels, mainly by the proliferation of nourishment. In 1960 Biirger characterized the degeneration of hard tissue in older people as “trasmineralization.” Older teeth generally change the color: mainly from the age of 50, the teeth yellow or yellowish brown, starting from the root to the crown. Rateitschak et al. In 1978 considered the reason for this change as a result of 1. an increase in the thickness of the dentin and cementum; 2. a deformation of the hard tissue of the tooth with a change in optical properties; 3. a discoloration of the material deposited on the rough surface; 4 Deposition on teeth with poor masticatory function and poor oral hygiene.