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随着熟食和食物越来越精细,现代人类的咀嚼器官发生退化现象。这表现在,与古代人相比,上、下颌骨变小,下颌后缩,牙齿变小且不锐利。而且颌骨退化比牙齿退化快,使骨的“总量”变小、牙的“总量”变大,造成骨量与牙量失调。这样就发生了全数牙齿在颔骨中排列不开的现象。由于排列拥挤,最后端的牙齿(第三磨牙,又称智齿)常常萌不出来,被埋在牙龈之下或颌骨之内。这就是“智齿难生”,或称“智齿阻生”(图1)。智齿冠周炎是指阻生智齿牙冠周围软组织的炎症。下颌智齿阻生,在它萌出不全时,常因部分牙冠
With the delicacy of cooked food and food, the degeneration of the chewing organism of modern humans occurs. This is manifested in that, compared with the ancients, the upper and lower jaws become smaller, the jaws retract, the teeth become smaller and not sharp. And degenerative jaw faster than the degenerative teeth, so that the bone “total” smaller, the “total” teeth become larger, resulting in bone mass and tooth volume disorders. In this way, the phenomenon that all the teeth are not arranged in the stapes bone has occurred. Due to crowding, the rearmost teeth (the third molars, also known as wisdom teeth) are often not erupted, buried under the gums or in the jaws. This is the “wisdom teeth hard to come by,” or “wisdom teeth impacted” (Figure 1). Wisdom pericoronitis refers to the impaction of the soft tissue around the wisdom tooth crown inflammation. Impacted mandibular wisdom teeth, incomplete eruption in it, often due to some crown