1. Anatomy of edentulism. vertical atrophy 2. Short and extra-short implants 3. Biomechanics of short an extra-short implants 4. adatption of surfaces to tissues: Bioblock concept 5. Rehabilitation of the posterior sector of the maxilla with vertical atrophy 6. Extra-Short implants in the macilla at the anterior level 7. Extra-Short implants in mandubiar atrophy 8. Rehabilitation of moderate-extreme mandubular atrophy in total endentulism 9. Prostheses on short implants