Bone augmentation should be performed prior to and/or simultaneously with implant placement when the preoperative examination shows a lack of alveolar bone volume at the implant placement site.
Horizontal or vertical alveolar bone augmentation procedures usually cannot be avoided in edentulous regions. Many studies have shown that GBR is predictable treatment at infrabony defects. However, GBR on extrabony defects still shows a lack of predictability.