Purpose: A technique is presented which utilizes a trephine with a 3.0-mm external diameter followed by an osteotome to implode a core of maxillary posterior alveolar bone prior to immediate implant placement. Materials and Methods: The technique and its indications and contraindications are described in detail. Results: One hundred sixteen implants were placed and uncovered utilizing this technique. Two implants were mobile at the time of uncovering. Discussion: One hundred fourteen implants were restored and have been functioning successfully for up to 4 years according to the Albrektsson criteria, yielding a success rate of 98.3%. Conclusion: No implants have been lost or are failing in function. Keywords: guided bone regeneration, implants, osteotome, sinus augmentation, trephine