Abstract: A technique for installing in the maxilla of a patient a dental implant assembly having a root section, a post section and a nut or locking element section. The root section is treaded to define a self-tapping screw which at its rear end is attachable to the post section and at its front end to the locking element section. To carry out this technique, the root section is screwed into a hole bored in the maxilla, the nose at the front end of this section then projecting into tie adjacent sinus cavity. The membrane lining the sinus cavity is lifted to admit the locking element section which is then attached to the nose to lock the root section to the maxilla. Then a charge of bone particles is deposited in the cavity to cover the nut section and the surrounding maxilla region. In a time period lasting several months, the bone particles gradually fuse with and graft onto the maxilla to augment its structure and embed the locking element section therein.