图三(单独):三号牙拔除后,颊侧牙龈缺损也比较厉害(箭头)。牙槽窝正中黑洞(鄂侧根)通向上颌窦

图三原文

Xin Wei, DDS, PhD, MS 1st edition 02/24/2013, last revision 04/20/2013