Abstract: This paper reports on the implant restoration of a case with severely insufficient residual bone height and limited interarch distance in the maxillary posterior region, aiming to provide reference value for the treatment of such patients. In this case, occlusal reconstruction of other teeth was performed first to raise a portion of the occlusion. However, after occlusal reconstruction, the interarch distance remained insufficient. Subsequently, transalveolar sinus floor elevation and bone augmentation surgery were performed at the implant sites to create stable conditions for the late implant placement with surrounding bone. A second transalveolar sinus floor elevation was performed 8 months later, with two taper-retained short implants placed deep under the bone level simultaneously. Follow-up examinations indicated good osseointegration. The peri-implant bone tissue was shown to be stable during the follow-up 2 years after the permanent restoration. Therefore, if the residual bone height and interarch distance in the maxillary posterior region are severely insufficient, transalveolar sinus floor elevation and bone augmentation can be performed first to create a stable condition for bone integration around the implant during late implant placement. Then transalveolar sinus floor elevation and the deep implant placement of short implants can be carried out during the second surgery to create sufficient restorative space for the final restoration.

Key words: Transalveolar technique for sinus floor elevation, Late implant placement, Limited interarch distance, Short implant, Occlusal reconstruction