The mandibular implant made of e-PTFE has four parts, including the ascending ramus part, the gonial angle part, the lateral cortex part and the base part.

• 下颌角肥大截骨过多以及发育不良导致骨缺损的特点是：下颌骨局部缺损面积较小，不影响骨的连续性，但影响美观。