Methods: Three-dimensional finite element was adopted to compare stress and displacement on osteotome-bone interface at the different shapes of top osteotomes top at osteotome sinus floor elevation.

• 方法:采用三维有限元方法比较骨挤压上颌窦提升术当骨挤压器顶端不同形状时,骨挤压器-骨组织界面的应力和位移情况。