If it does not increase very carefully to protect susceptible to diseases , the most common are stomatitis , oral ulcers , dental caries , gingivitis , pulpitis , periodontal abscess , alveolar abscess , dentin allergies 如若不加仔细保护很容易生病，最常见的有口腔炎、口腔溃疡、龋齿、牙龈炎、牙髓炎、牙周脓肿、牙槽脓肿、牙本质过敏等。
Results : there was no remarkable difference in the density of alveolar bone between men and women in 35 54 - year - groups ( p 0 . 05 ) , the alveolar bone density in men was heigher than that in momen in 55 64year - groups 结果： 35 54岁之间，男性与女性之间牙槽骨骨密度值无显著差异，而牙槽骨愈合速度有一定差异； 55 64岁年龄组男性牙槽骨骨密度值高于女性。
In the more severe stages of periodontal diseases , teeth can become loose and may even fall out and gums are red and swollen , and bleed easily . it does great harm to our health and it is one of diseases which result in tooth loss 此病的主要表现是牙红肿出血流脓牙槽骨吸收牙松动移位和咀嚼无力或酸痛，其危害性极大，是一种导致人类缺失牙的主要疾病之一。
Results : there was no significant effect on the stress distribution in the supporting tissue according to the different numbers of abutments at the central occlusion , and there was an evenly stress distribution in the abutment and alveolar membrane of the area around the missing teeth 结果:基牙和人工牙在正中咬合时,基牙数目对支援组织的应力分布无明显影响,且基牙利牙槽幡顶黏膜的应力分布均匀。
