Letzel, H Tarnish, corrosion, marginal fracture, and creep of amalgam restorations: a two-year clinical study. [electronic resource] - Operative dentistry 1978 - 82-92 p. digital Publication Type: Comparative Study; Journal Article ISSN: 0361-7734 Subjects--Topical Terms: AdolescentAdultCorrosionDental AmalgamDental Restoration, PermanentHumansStress, MechanicalSurface Properties