Struggles and Successes -- History as Documented by Patents and Patent Applications -- Morphology of BOI Implants and Related Designs -- Insertion Tools and Implant Designs -- Equipment and Surgical Techniques -- Diagnostics -- Treatment Planning -- Aspects of BOI Treatment in Periodontally Involved Cases -- Four-Dimensional Considerations of Bone Morphology and Mechanics -- Functional Considerations as the Guiding Treatment Principle -- Prosthetic Treatment Considerations -- Replacing Molars in Both Jaws -- Anterior Masticatory Patterns and Class II Skeletal Relations -- BOI Treatment in the Presence of Class III Skeletal Relations -- Treating the Atrophied Mandible -- Tuberopterygoid Screws -- Functional Prosthodontic Treatment and Restoration of the Vertical Dimension in Craniomandibular Disease -- Implant Treatment Along the Maxillary Sinus -- Bar Attachments on BOI Implants -- Aesthetics -- Mechanics Meets Biomechanics -- Primary Augmentation Using BOI Implants -- Histology of BOI Implants -- Counselling and Case Acceptance -- Legal Aspects of Therapeutic Alternatives and Costs: Court Decisions and Health Insurers -- Maintenance -- From Knowledge and Skill to Action.Basal Osseointegration as a procedure developed on the basis of disc implantology is the method most commonly used for the unilateral treatment of advanced maxillary atrophy. The method is extremely well developed, because it was refined over a period of decades exclusively by practitioners and become established independently of the universities. The treatment aim can be achieved safely, easily and at low cost. Principles of BOI is most practical and explains exactly how things work. It provides treatment plans, tricks and pitfalls and step-by step guidance.