1. Restorative Dental Materials;Peyton,1968
2. Presence or absence of plaque on subgingival restorations;Waerhaug;Scand J Dent Res,1975
3. Gingival changes following porcelain crown therapy;Mannerberg;Odontol Revy,1971
4. Ceramics and periodontal tissue;Decool;Rev Stomatoodont Nord France,1972
5. A study of porcelain surfaces as utilized in fixed prosthesis;Barghi;J Prosthet Dent,1975