Reduction of microleakage around new amalgam restorations

Article Abstract:

A perfect filling material that completely binds to the tooth and seals all margins has not yet been developed. Standard dental amalgam always leaves a slight gap, which may serve as an entry point for bacteria. Microleakage into the gap between the tooth and the filling may cause inflammation and recurring cavities. Therefore, care should be taken to consider all the factors which contribute to minimizing this gap. During preparation of the amalgam, the proper ratio of mercury to alloy must be maintained. In addition, both undermixing and overmixing can occur, and these affect the way the filling subsequently expands to fill the cavity. Of the two, undermixing is less desirable. The type of alloy is very significant, and studies have indicated that alloy prepared by lathing is preferable to alloys consisting of spherical particles. The adequate preparation of the cavity for insertion of the restorative material is critical; the cavity must be clean, and the use of varnish is the most effective method of reducing microleakage. Although some special varnishes are advertised as reducing microleakage, research has indicated that this claim is not necessarily justified. The use of adhesives has been shown to significantly reduce microleakage, but the long-term stability of such bonds has yet to be evaluated. Burnishing has been shown to reduce microleakage, and double burnishing, both before and after carving, is even more effective. The detrimental effects which result from a poorly formed gap demand that care be taken to properly prepare the amalgam and the cavity. Fortunately, experience has indicated that when appropriate measures are taken, the amalgam forms a tight seal and provides minimal opportunity for microleakage. (Consumer Summary produced by Reliance Medical Information, Inc.)

Dental materials

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Influence of cavity dimensions, insertion technique and adhesive system on microleakage of Class V restorations

Article Abstract:

The details of study, which verified the hypothesis that microleakage is influenced by the dimensions of Class V cavity preparation, insertion technique and adhesive system used, are presented. Microleakage of composite restorations depends on communication between dimensions of cavity preparation and adhesive system. For large restorations, the choice of adhesive system influenced microleakage whereas in small restorations, the choice of adhesive system is not an influential factor.

Dental equipment and supplies, Dental Equipment and Supplies Manufacturing, Dental Adhesives, Dental glass ionomer cements, Dental restorations

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A dose-effect analysis of children's exposure to dental amalgam and neuropsychological function: the New England Children's Amalgam Trial

Article Abstract:

The New England Children's Amalgam Trial (NECAT) compared neuropsychological outcomes of children aged 6 to 10 whose caries were restored using dental amalgam and those whose caries were restored using mercury-free resin-based composite. The results of the trial showed that the use of dental amalgams was not associated with any adverse neuropsychological effects.

Dental resins, Neuropsychological tests for children, Childhood neuropsychological tests, Dental acrylic resins, Clinical report

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