Optimizing the procedure for mercury recovery from dental amalgam
Braz. oral res
;
22(2): 119-124, 2008. graf
Artigo
em Inglês
| LILACS
| ID: lil-485950
ABSTRACT
Mercury, as any other heavy metal, may cause environmental damages due to its accumulation and biotransformation. Dental offices, whether private or institutional, use dental amalgam as a restorative material on a daily basis. Dental amalgam is composed of mercury (50 percent), silver (30 percent) and other metals. Approximately 30 percent of the amalgam prepared in dental offices (0.6 g per capsule) are wasted and inadequately discarded without any treatment. Methods for mercury recovery have been proposed previously, using high temperatures through exposure to direct flame (650°C), long processing time, and hazardous reagents as potassium cyanide. The purpose of this study was to develop a method to replace the direct flame by an electrical mantle in the process of mercury recovery. Results showed an average mercury recovery of 90 percent from 2 kg of amalgam after 30 minutes of processing time, thus optimizing the procedure. The proposed modifications allowed a significant reduction in processing time and a mercury recovery with high purity. The modified process also provided minimization of operator exposure to physical, chemical and ergonomic hazards, representing a technological advance compared to the risks inherent to the original method. It also provided environmental health and economy of energy resources by replacing a finite energy source (fossil and organic) by a more environmentally appropriate electric source, resulting in significant improvement of the procedure for mercury recovery from dental amalgam.
Texto completo:
DisponíveL
Índice:
LILACS (Américas)
Assunto principal:
Eliminação de Resíduos de Serviços de Saúde
/
Resíduos Odontológicos
/
Gerenciamento de Resíduos
/
Amálgama Dentário
/
Exposição Ambiental
/
Mercúrio
Tipo de estudo:
Estudo de etiologia
/
Fatores de risco
Limite:
Humanos
País/Região como assunto:
América do Sul
/
Brasil
Idioma:
Inglês
Revista:
Braz. oral res
Assunto da revista:
Odontologia
Ano de publicação:
2008
Tipo de documento:
Artigo
País de afiliação:
Brasil
Instituição/País de afiliação:
Dental and Environmental Consultant Co/BR
/
Fluminense Federal University/BR
/
University of Piracicaba/BR
/
University of São Paulo/BR
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