“…1,2,4,[6][7][8][9][10] According to Healey & Phillips, most failures of amalgam restorations occurred due to technical errors by the operator (56% due to incorrect cavity preparation and 40% due to improper material handling), and only 4% occurred due to several causes, which can also be validated with the data produced by this study, where most failures occurred in restorations with silver amalgam, and it is possible to note an excess of this restorative material and failures in its adaptation to the tooth. [12][13][14]16,18,20 Gingivitis is the most common form of periodontal disease, and its etiology is related to the accumulation of biofilm. Excessive restorations favor this accumulation, which consequently leads to the development of periodontal disease.…”