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本文通过对300例干燥头颅的随机截面研究,发现上下颌骨基部相对稳定,而牙槽突在垂直与水平方向改变明显。作者根据牙槽骨的吸收程度,将下颌骨分为4组,上颌骨分为3组进行测量。各组间所测数据的均值均有显著差异,而上下颌骨基部各组间均值无统计学差异。牙槽骨的改变有一定的规律可循。据此作者对无牙颌骨进行了如下分类: Ⅰ类:有牙齿牙槽骨。Ⅱ类:新近拔牙后牙槽骨。Ⅲ类:牙槽嵴丰满,长、宽度充足。Ⅳ类:刀边开嵴,高度充足,宽度不足。Ⅴ类:平坦形嵴,高、宽度均不足。Ⅵ类:凹陷形嵴,部分基部骨吸收(见图)。
In this paper, 300 cases of dry skull random cross-section study found that the base of the upper and lower jaw is relatively stable, while alveolar protrusion changes in the vertical and horizontal direction. According to the degree of alveolar bone absorption, the authors divided the mandible into four groups and divided the maxilla into three groups. There was a significant difference between the mean values measured by each group, while there was no significant difference between the groups in the maxilla and mandible base. Alveolar bone changes have a certain rule to follow. According to the author of the edentulous jaw were classified as follows: Ⅰ type: a tooth alveolar bone. Class II: Alveolar bone after tooth extraction. Class Ⅲ: alveolar ridge full, long, wide enough. Ⅳ categories: knife edge ridges, highly adequate, insufficient width. Ⅴ categories: flat-shaped ridge, high and low width. Ⅵ class: Depression ridge, part of the base bone absorption (see photo).