随着医疗与经济的发展,种植修复已经成为牙缺失的常规修复方法,不过临床上约40%的患者在行下颌牙种植修复时牙槽骨仍存在骨量不足的问题[1]。由于下牙槽神经管的存在,使种植手术受到一定限制,通常需要进行Onlay植骨、下牙槽神经移位和牵张成骨等前期手术来增加种植术区的骨量[2]。然而由于这几类手术程序复杂、创伤大,多数患者会放弃种植修复的选择。本病例下颌后牙区骨高度严重不足,通过利用锥形束CT With the medical and economic development, implant repair has become a routine repair of dental loss, but about 40% of patients in clinical practice of mandibular dental implant restoration of alveolar bone is still insufficient bone problems [1]. Due to the existence of the inferior alveolar nerve canal, implant surgery is limited, and usually require pre-surgery such as Onlay grafting, inferior alveolar nerve displacement and distraction osteogenesis to increase the bone mass in the implantation area [2]. However, due to the complexity of these types of surgical procedures, trauma, most patients will give up the choice of implant repair. In this case, the posterior teeth of the mandible are severely underdeveloped, using cone-beam CT