Bicortical stability of implants placed in severely atrophic posterior maxilla: A case report

Maxillary sinus lift is a common procedure to achieve adequate alveolar bone height in patients  with sinus hyper-pneumatization. Simultaneous implant placement with sinus floor augmentations  is possible when appropriate primary stability could be achieved. In severe atrophic posterior  maxillary ridge, vertical bone height is sometimes less than 4mm, which may hinder simultaneous  implant placements and necessitate two stage procedure. In current study, a novel technique is  described to perform a single stage implant placement with bicortical stability in severe atrophic  maxilla that can shorten the treatment time of an edentulous patient. During the procedure, to  achieve an adequate access a conventional lateral window osteotomy is performed. After elevating  the Schneiderian membrane using conventional instruments, an autologous ramus block is harvested  from the mandible and then the block will be fixed in correct location in the sinus using  screws withb appropriate length to build sufficient stability as superior cortex for simultaneous  implant insertion.