"Association of Peri-implantitis and Maxillary Sinusitis: a Case-control Study".

Inclusion Criteria: * Men and women between 18-80 years of age * Patients with implants in the posterior sector of the upper jaw * Dental implant carriers with a follow-up of more than 5 years * Patients who have undergone a CT scan for the evaluation of these implants or for other reasons Exclusion Criteria: * Patients with uncontrolled systemic disease * Pregnant or lactating patients * Heavy smokers (HS) * Patients with uncontrolled or active periodontal disease in need of periodontal treatment * Patients with zygomatic or pterygoid implants * Patients taking medications known to modify bone metabolism or who have degenerative bone disease (hyperparathyroidism, osteoporosis), vitamin D, patients who have taken antibiotics, NSAIDs or corticosteroids for more than two weeks in the last 3 months prior to the examination.