The results were as follows:1. The residual ridgeresorption may be effected by multiple factors simutanously. Systemic factors should not be ignored.
结果表明：1。牙槽骨吸收受多种因素的共同影响，全身因素的作用值得重视；
2
Thus it is an important topic of minimizing the degree of ridgeresorption after tooth extraction to meet the future appearance and functional needs of denture production.
因此减少拔牙后齿槽脊的吸收，帮助日后制作的假牙满足功能和美观上的需求是临床上一个重要的课题。
3
Objective:To investigate the effect of implantation of particulate hydroxylapatite artificial bone after tooth extraction on resorption of the alveolar ridge.