The history of amalgam (which essentially consists of mercury and silver) is briefly reviewed, from its origin through different civilizations. The various ways by which silver was extracted during colonial times are mentioned; credit for invention of the method, however, still remains unknown. Finally, the study lists the purposes for which the amalgam was originally used, mainly for the benefit of the mining industry, and only much later introduced into medicine and hence onto odontology.
A study was undertaken to ascertain the effect of [glass-and-silver fillings ionomer] on the pulp tissue at different times (15, 30 and 60 days). For that purpose, 34 premolars were evaluated, on which a basic coating of calcium hydroxide was applied previous to their obturation with an ionomer cement (Ketac Silver). Dental organs were divided in four groups, namely: untreated control, and three groups of 10 premolars which were extracted after 15, 30 and 60 days. Results yielded by this research suggest that applying a calcium hydroxide coating is not enough to prevent the toxic effect of the glass ionomer on the pulp.
In most animal species, acute fluorosis is triggered by the accidental consumption of substances with a high content of fluorine, widely used in pest control. Fluorine normally concentrates in bones and teeth, and forms nearly 0.05% of these structures in mature animals, positively contributing to increase resistance of enamel to caries and favoring mineralization after eruption, a process which increases with age. The present article submits a form of study of fluorosis, stressing due warning as to its harmful effects.
Atrophy of the alveolar process can be avoided by intentionally preserving dental roots in patients with ideal parodontal and pulpar health conditions. This article illustrates results with a representative case history.
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