Clear GUIDELINES, when exactly you should use which technique like the Split Bone Technique by Prof. Khoury, when use pure vital bone chips, what indication for the use of bone substitutes and GBR technique. Differentiation of the "inside and outside the contour defects". Explanation of the Concept of Biological Bone Augmentation (BBA Concept) with the Split bone technique from Prof. Fouad Khoury The `Bone core technique` of Prof. Fouad Khoury.