As a general rule, a minimum of 1 millimeter of bone is required around a dental implant. More space is required when the implant is next to a tooth or another implant. If there is insufficient bone to completely envelope the implant, a dental bone graft will be required. When evaluating the bone height, there should simply be sufficient bone so that the implant will be completely submerged. When placing implants in the upper jaw, there may not be enough room vertically, and a sinus lift may be required to reconstruct the bone.