Plasma Rich in Growth Factors in the Preservation of the Alveolar Ridge After Simple Molar Tooth Extractions.

Inclusion Criteria: * Age\> 18 years * Clinical indication for simple tooth extraction in the posterior sectors (from the second premolar to upper and lower second molars) * Need to place a dental implant in the same position of the extraction * Availability of observation during the period of treatment * Signature of the informed consent Exclusion Criteria: * Third molars * Active periodontal disease * Simultaneous extraction of two adjacent pieces in the same quadrant * Oral dehiscence ≥ 25% * Alveolus depth \<7mm * Loss of some wall of the alveolus * Severe inflammation in the extraction area * Previous diagnosis of coagulopathies * Previous diagnosis of autoimmune disease * Be receiving, or have received the 30 days prior to extraction treatment with radiotherapy, chemotherapy, immunosuppressants, systemic corticosteroids or anticoagulants * Regular treatment with NSAIDs * History of chronic hepatitis or liver cirrhosis * Positive markers for HCV, AfHBs, HIV-I / II or TP * Diabetes mellitus with poor metabolic control (evidence of glycated hemoglobin\> 9%) * Dialysis treatment * Presence of malignant tumors, hemangiomas or angioma in the extraction area. * History of ischemic heart disease in the last year * Pregnancy or women of childbearing age who do not take action contraceptives * Lactating women * Previous diagnosis of metabolic bone disease * Antiresorptive treatment * Treatment with monoclonal antibodies * Smoker\> 10 cigarettes / day * Any inability to participate in the study