1. Some common defects in operative/restorations contributing to the injury of the supporting structures;Bryan;JADA,1927
2. Effect of rough surfaces upon gingival tissue;Waerhaug;J Dent Res,1956
3. Presence or absence of plaque on subgingival restorations;Waerhaug;Scand J Dent Res,1975
4. Tissue reaction to dental calculus and to filling materials;Zander;J Dent Med,1958
5. Marginal fit of restorations and its relation to periodontal bone level 1: metal fillings;Bjorn;Odontol Revy,1969