In implant dentistry, the concept of multi-modality originates from the comprehensive collection of evidence-based different implant modalities, surgical and prosthetic techniques. When correctly indicated and utilized, they can coexist and be successful in treating the same patient.The cultural environment of the Italian Implant Study Group (G.I.S.I.) has been originated 1967-1997 period contributions of experiences conveyed by surgeons from all over the world. In this open-minded environment, resolutions continuously enriched and developed a multi-modal approach in oral implantology we have today.The New Italian Implant Study Group (New G.I.S.I.) shares a significant part of the contents and pursues the best surgical and prosthetic techniques.Multi-modal approach, Bicorticalism, Intra-oral welding, together with the last technologic originalities (Piezo Surgery, Intra-Oral Scanning, Cad/Cam, Surgical Guides, Maxillary Sinus Augmentation, Subperiosteal Implants, Zygomatic Implants), are extensively described in this book.New G.I.S.I. is an affiliated of the American Academy of Implant Prosthodontics (A.A.I.P.).