Indications and reasons for extraction socket preservation/augmentation Aesthetic zone Non aesthetic zone
Aesthetic
Impossible to reach sufficient aesthetic result Facial soft tissue deficiency of extraction socket
Absence of buccal wall of extraction socket > 50% Absence of buccal wall of extraction socket
Horizontal bone loss ˃ 2 mm Horizontal bone loss ˃ 3 mm
Functional
Impossible to gain implant primary stability  Available bone beyond the apex of extraction socket ˂ 3 mm and absence of implant to bony walls contact Available bone beyond the apex of extraction socket ˂ 3 mm and absence of septal bone
Risk related
Risk of significant alveolar bone resorption Multiple extractions when buccal extraction socket wall thickness
< 2 mm and thin (< 1 mm) biotype
Postponed or not recommended implantation for some reasons
Risk of apical peri-implantitis development Presence of extraction socket bone lesions ˃ 5 mm
Risk of maxillary sinus perforation and reducing the need for elevation of the sinus floor Presence of roots penetrating into maxillary sinus
Risk of nasal floor perforation and reducing the need for elevation of the nasal floor Presence maxillary alveolar process atrophy in nasal floor projection