Influence of the Design of the Transmucosal Abutment on the Periimplant Bone Level

Inclusion Criteria: * Absence of systemic and periodontal pathology, over 18 years of age, with a plaque index below 25%. * Absence of at least one tooth, with natural adjacent teeth, allowing a prosthetic rehabilitation with an osseointegrated implant and a prosthetic unit. * Adequate bone quality available, allowing placement of MOZO GRAU® implants InHex STD QUATTRO with diameters of 3.75 mm or 4.25 mm and lengths of 8, 10 and 11.5 mm. * Natural teeth or implants with fixed restoration as antagonists. Exclusion Criteria: * Systemic factors: * Continuous administration of systemic medication that can interfere with the bone metabolism or medical conditions requiring prolonged use of steroids and / or medications that can interfere with bone metabolism. * History of leukocyte dysfunction and deficiency, immunodeficiency syndromes, kidney failure or bone metabolic disorders, such as osteoporosis. * Physical disability that may interfere with proper oral hygiene. * Use of any investigational medication or device within the previous 30 days to implant surgery in the study. * Alcoholism or drug addiction * Smoker of more than 10 cigarettes per day. * Conditions or circumstances that could prevent compliance with participation in study or interfere with the analysis of results, such as a history of breach or unreliability. Local factors: * History of local radiotherapy. * Bruxism. * Diseases that affect the oral mucosa, such as oral lichen planus. * Untreated periodontitis. * Persistent intraoral infection. * Post-extraction alveoli not cured (less than 6 weeks after extraction).