Private Pratice in Oral Surgery and Implantology, Clínica Delille, Coimbra, Portugal CASE 1 > Piezosurgery indirect sinus floor augmentation technique with Geistlich Bio-Oss® Collagen and immediate implant placement. CASE 2 > Lateral sinus floor and horizontal augmentation with Geistlich Bio-Oss® Pen. > Implant placement after 6 months of healing. > Crestal approach for subnasal floor elevation with Geistlich