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人过中年之后,机体的生理功能逐渐减退,加上一些中老年人对口腔卫生不够注意,如患龋齿、牙周病、外伤等,造成部分牙齿或全口牙齿缺乏和脱落。这种情况不但影响了美观和发音,还能因缺牙,对食物不能充分咀嚼磨细而影响消化和吸收,加重了胃肠负担,可导致消化不良等胃肠疾病。同时牙列缺失后,咀嚼功能下降,颞颌关节功能紊乱,残留的牙槽骨不断地萎缩,面部下三分之一变短,肌肉失去正常张力,使面部皱褶增加,口角下垂,显得苍老。 还有,牙齿缺乏后,上下颌骨失去
After middle age, the physiological functions of the body gradually diminish. Coupled with the fact that some middle-aged and elderly people do not pay enough attention to oral hygiene, such as dental caries, periodontal disease and trauma, they cause partial or complete tooth loss and shedding. This situation not only affects the appearance and pronunciation, but also due to lack of teeth, the food can not be fully chewed and affect digestion and absorption, increasing the burden of gastrointestinal, can lead to indigestion and other gastrointestinal diseases. At the same time the dentition is missing, chewing function decreased, the temporomandibular joint dysfunction, residual alveolar bone continued to shrink, one-third of the face shorter, the muscles lose normal tension, so that facial wrinkles increase, mouth droop, appears old . Also, the lack of teeth, the loss of the upper and lower jaw