Treatment of Multiple Gingival Recession Defects Using a New Xenogenic Collagen Membrane Compared to Connective Tissue Graft: a Randomized Controlled Split-mouth Clinical Study

Inclusion criteria: * Patient with 3 contiguous, symmetrical and bilateral RTI Cairo gingival recessions (Miller Class 1) (i.e. 6 recessions) * Patient non-smoker * Patient affiliated to social security * Patient signed informed consent. Exclusion criteria: * Patient with or having presented an acute or chronic severe cardiovascular, kidney, liver, gastrointestinal, allergic, endocrine, neuropsychiatric pathology, developed cancer of the upper aero digestive tract treated with radiotherapy * Patient with severe hemorrhinopathy * Patient treated with oral retinoids, bisphosphonates, oral or anticonvulsants * Patient who has taken steroidal or non-steroidal anti-inflammatory therapy, anti-cancer or immunosuppressive chemotherapy within the last 6 months. * Patient with contraindication to necessary and pre-, per- or post-operative treatments * Follow-up of the patient seemed difficult by the investigator * Patient with insufficient oral hygiene incompatible with oral surgery