The goal of this research project is to assess the clinical performance and degradation of bioresorbable Mg- based pins for membrane fixation in patients with sinus floor elevation.

Inclusion Criteria:

• Healthy patients in the aged > 21 years.
• fully or partially edentulous with unilaterally or bilaterally missing upper premolars or molars and an insufficient residual bone height to guarantee primary stability of implants; and requiring a staged approach of SFE and implant surgery
• Subject has been informed and signed the informed consent

Exclusion Criteria:

• Smoking more than 9 cigarettes per day
• Irradiation in the maxilla-facial region,
• A known metabolic skeletal disease (such as osteomalacia, osteoporosis or osteogenesis imperfecta) or medications that can affect the bone structure
• Allergies / intolerances to the materials
• Known malignancy
• Epilepsy or anamnestic evidence of recurrent falls
• Pregnancy (as contraindicated for CBCT imaging that is routinely performed)
• Manifest hepato-renal disease
• Inability or unwillingness to give informed consent.

Patient requiring a staged approach SFE