“…25,26 Bone allografts were introduced in the 1970s, 27 but only recently have they been used as onlays for alveolar augmentation. [28][29][30][31] These grafts include mainly fresh-frozen, freeze-dried, or demineralized freezedried bones that are harvested from cadaveric sources, processed, and stored with different techniques. 32,33 Although some studies have reported immunologic reactions using some types of allografts, 34,35 freezedried allografts are unlikely to induce a sensitization response in the host tissue.…”