老年人牙齿的增龄性改变明显,牙本质出现重度磨耗,牙龈退缩,根面外露,在牙根部牙骨质上发生的龋坏往往波及牙本质的损害为根部龋。根部龋有很高的发病率,是老年人常见的口腔疾病,由于其发病部位隐蔽以及根面复杂的解剖因素,使其难以早期发现,治疗较为困难[2]。窝沟封闭是使用窝沟封闭剂严密封闭牙冠表面的窝沟点隙,防止食物残屑的堆积和细菌的生长,从而预防 Age of the elderly changes significantly aging dentin appeared severe wear and tear, gingival recession, exposed root surface, the occurrence of dental carious in the root of the tooth decay often affects dentine damage as the root caries. Root caries have a high incidence of oral diseases that are common in the elderly, because of its hidden parts of the disease and root complex anatomical factors, making it difficult to early detection, treatment is more difficult [2]. Fissure sealant is the use of pit and fissure sealant sealing the surface of the pit to close the gap, to prevent the accumulation of food debris and bacterial growth, and thus prevent