Failure to remove distal or buccal bone while removing one of these teeth can cause the entire maxillary tuberosity to be fractured off, thereby tearing out the floor of the maxillary sinus.
在拔牙的过程中如果远端骨或颊骨移动失败就会造成整个上颌结节断裂，从而造成上颌窦底撕裂。
2
Collagen fiber damage caused by cyclic leaflet bending may ultimately lead to the observed leaflet tearing, calcification up to failure of BPVs.