Inclusion Criteria:  Patients in need of at least one bilateral tooth extraction due to one or more of the following causes:  periodontal disease, vertical fracture included teeth. Patients seeking dental implant to replace their missing teeth. All sockets should have intact or partially conserved buccal wall according to Elian´s classification (Type I, II).  Exclusion Criteria:  Patients under 18 years old. Patients with a severely untreated periodontal disease. Smokers of more than 15 cigarettes a day. patients suffering from any systemic disease requiring pharmacological treatment. Patients whose socket´s buccal wall is totally missing after tooth extraction