女。19岁。感觉牙齿咀嚼无力2年，检查：<img src="https://nimg.ppkao.com/2015-09/yeni/2015091616541163729.jpg?sign=967d0ada7f18185127f83bd924cabbca&t=62d46cd8" />等松动Ⅱ度，<img src="https://nimg.ppkao.com/2015-09/yeni/2015091616542337979.jpg?sign=3250e160b308075f8aaf42ade356ac91&t=62d46cd8" />松动Ⅰ度，牙龈轻度肿胀，菌斑少。袋深4～6mm。X线示片：<img src="https://nimg.ppkao.com/2015-09/yeni/2015091616543190371.jpg?sign=041802e4c72a60cc46b3809e1298bcb8&t=62d46cd8" />牙槽骨明显吸收，而牙槽骨吸收为角状。该病最可能的诊断为（）<br />