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PubMedDate not supplied

Fracture strength of dental amalgams restoring exclusively proximal Elderton and Almquist cavity preparations.

The purpose of this investigation was to evaluate under experimental conditions the influence of six different brands of dental amalgam, exclusively in proximal cavity preparations (proposed by Elderton and Almquist and associates) on failure characteristics of these "restored dice" teeth. The volume of amalgam contained in each cavity was also calculated. The static "masticatory force" was applied through a small steel-ball (2.5 mm) in order to cause the failure of the amalgam condensed in a cavity on prepared Ni-Cr dice. No statistical significance at 0.05 level was observed for the variables (two types of cavity and six amalgam alloys), considering that the cavity design proposed by Elderton has a volume of material about 18.35% smaller than the Almquist one.

Bite Force↗
PubMed1993

The possible relationship between mercury from dental amalgam and diseases. I: Effects within the oral cavity.

Mercury is released from dental amalgams, and therefore it is necessary to consider the biological and clinical consequences of such exposure. Intraorally, it would appear as though mercury can cause hypersensitivity/toxic reactions resulting in lichen planus lesions, and may play a major role in the pathogenesis of gingivitis, periodontitis and periodontal disease.

Autoimmune Diseases↗
PubMed1982

Appearance of surfaces of dental amalgam in contact with gold. An in vivo study.

90 combined gold-amalgam specimens of three dental gold alloys and two amalgams were placed subcutaneously, intraperitoneally and in the cheek pouches of 15 golden hamsters. The appearance of the amalgam surfaces after one week was evaluated using scanning electron microscopy and light microscopy. The results showed that among the implants there was an obvious difference between the conventional amalgam and the non-y2 amalgam specimens as regards accumulation of plaque, which was much more pronounced on the conventional amalgams. The cheek pouch specimens with conventional amalgams differed markedly from the corresponding implant specimens, showing very little plaque accumulation. Some possible explanations for these observations are discussed.

Animals↗
PubMed1975

[Dental amalgam].

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Dental Amalgam↗
PubMed1995

Dental amalgam.

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Dental Amalgam↗
PubMed2000

A study of alternative metal particle structures and mixtures for dental amalgams based on mercury additions.

The perception that mercury in dental amalgam is toxic to the human organism has prompted worldwide efforts by the scientific community to develop alternative amalgam-like materials that utilize little or no mercury. In this investigation, an attempt is made to develop a new dental alloy system by adding liquid mercury to silver-coated Ag4Sn intermetallic particles in lesser amounts than are used in conventional amalgam alloys. An effort to precipitate the important eta-prime (Cu6Sn5) phase was made by adding pure Cu and Sn powders to the alloy formulation during trituration. Tytin a popular Ag-Sn-Cu single-composition, spray-atomized conventional dental alloy was used as the control to obtain baseline data for comparisons of microstructures and mechanical properties. Amalgamation of the coated particles with mercury, with or without the addition of Cu and Sn powders, mostly produced specimens with chemically non-coherent microstructures that were relatively weak in compression. These results were due, in part, to mercury's inability to chemically wet the Ag-coated particles and Cu and Sn powders because of naturally occurring surface oxide films. The strongest specimens tested had silver dendritic coatings, resulting in compression strength values up to 40% of the control's. Their higher strength is attributed to mechanical interlocking at the particle/matrix interfaces.

Journal Article↗
PubMed1994

[Patient views on dental amalgam. An exploratory questionnaire].

An introductory letter and a precoded questionnaire was sent to a large sample of the Dutch population in order to study their views on dental amalgam. Another sample was approached by interviewers to study the effect of non-response and a third sample was asked to complete a 'neutral' questionnaire so as to preclude any influence caused by the phrasing of the introductory letter and the questionnaire. It was found that the non-response did affect the results, while the phrasing of the letter did not. Based upon the comparison of the samples and taking the non-response into account, it is concluded that probably 17% of the Dutch population regard amalgam to be potentially harmful. At least 4-5% worry about their health because of amalgam fillings and 2-3% attribute existing health problems to amalgam. However, none of the respondents of the 'neutral' sample spontaneously reports amalgam as a causative factor for illness. The health problems mentioned by the respondents are diverse. Headache is mentioned most often, followed by fatigue and a metal taste.

Attitude to Health↗