4Donovan TE,Cho GC.Soft tissue management with metal-ceramic and allceramic restorations.J Calif Dent Assoc,1998;26(2):107.
5Kedici PS, Memikoglu MM, Kansu G. Case report: ionisation tendency of a base metal alloy in the oral environment. Eur J Prosthodent Restor Dent,1995;3(5) :231.
6ADA. Biological effects of nickel-containing alloys. J. Am. Dent. Assoc,1982; 104:501.
8Bessing C, Lundqvist P,Tillstrom B. A 3-year clinical study of alternatives to high noble dental casting alloys type 3. Acta Odontol Scand, 1990; 48(5):319.
9Fregert S, Kollander M, Poulsen J. Allergic contact stomatitis form gold dentures. Contact Dermatitis, 1979;5(1):63.
10Kaiser DA, Hummert TW. Assessment of gingival margin thickness before margin placement. J Prosthet Dent, 1994; 71 (3) :325.