‌A comparison on the amount of root coverage by two techniques: ‌Connective tissue graft and bioabsorbable bovine collagen ‌membrane I* - Dr. H. Golestaneh** zDr. M.T. Chitsa * - Assistant professor of Perodontics Dept. Faculty of Dentistry Tabriz University of Medical Sciences. ** - Assistant professor of Perodontics Dept. Faculty of Dentistry Isfahan University of Medical Sciences. Background...