This coffering technique seems to be fully adequate in case of a posterior mandibular atrophy with a narrow ridge and sufficient bone height. This technique has several assets. Guided bone regeneration is associated with the use of exclusively autologous bone grafts. It may be performed under local anesthesia. The donor site is close, and the regenerated bone is of good quality. Implant placement must be achieved from 4 to 6 months after graft surgery. The drawbacks of the technique are related to donor site possibilities, and to the alveolar ridge height. Morbidity is low.