8Danhlin C, Sennerby L, Lekhalm U, et al.Generation of new bone around titanium implants using a membrane technique: an experimental study in rabbits. Im J Oral Maxillofac Implants, 1989,4(4 ) :19 - 25.
9Nyman S, Lindhe J, Karring T, et al. New attachment following surgical treatment of human periodontal disease. J Clin Periodontol, 1982,9-290.
10Gordow J, Nyman S, Karring T, et al.New atracment formation as the result of eontrolled tissue regeneration. J Clin Periodontol, 1984,11: 494.