Effect of fluoride from glass ionomer on discoloration and corrosion of titanium.

The objective of the study was to examine the effects that fluoride ions released from different dental glass ionomer cements may have on titanium. The study included determination of the amounts of released ions and measurement of the color changes on titanium plates cemented with four kinds of commercial glass ionomer cements due to immersion of such "sandwich specimens" in 1% saline (NaCl) solution. The discoloration of titanium in the presence of glass ionomer cements was observed.

Disinfectants' effect on mercury release from amalgam.

Background: Mercury environmental discharge is under increased scrutiny by the U.S. Environmental Protection Agency (EPA).

Passivation of dental amalgams and mercury release.

Objectives: In this study the rate of dissolution of mercury from two dental amalgams with different compositions and structures was determined in vitro under different oxidation and abrasion conditions, and the results were correlated with the electrochemical characteristics.

Methods: A spherical high copper and a lathe-cut very high-copper amalgam were tested in aerated and deaerated artificial saliva. The electrochemical characteristics were determined by potential-time, anodic polarization, polarization resistance and cathodic stripping measurements.

Evaluation of corrosion degradation of amalgams by immersion and fracture test.

In this study an immersion and fracture test was used to evaluate the susceptibility of dental amalgams to degradation of their mechanical strength by corrosion. Specimens of each of the six types of high-copper amalgams and one type of low-copper amalgam were prepared and tested. Cylindrical specimens were grooved using a diamond cutoff blade and immersed in 1% NaCl to which H2O2 was added to increase the oxidation power.

Influence of liquid films on mercury vapor loss from dental amalgam.

Objectives: The aim of this study was to determine the effect of aqueous liquid films on Hg emission from of dental amalgam.

Methods: Amalgam specimens (4 mm dia. x 4 mm long) made from ten alloys were uniformly abraded on wet ASTM 600 grit SiC paper, quickly dried and covered by liquid films of a thickness that approximated the thickness of saliva films on tooth surfaces in vivo.

Interaction of vascular smooth muscle cells with collagen-impregnated embolization coils studied with a novel quantitative in vitro model.

Background And Purpose: Modifications of aneurysm occlusion devices and other biologically active molecules may reduce the risk of recanalization by promoting vascular cell migration, adhesion, and proliferation. Our purpose was to apply in vitro methods in the qualitative and quantitative analysis of vascular smooth muscle cell (VSMC) interactions with collagen-impregnated microcoils.

Methods: The adhesion of rat aortic VSMCs to collagen fiber bundles (CFBs), nitinol coils, and collagen-impregnated nitinol coils (CINCs) was examined by using an assay consisting of monopulse exposure to increasing concentrations of rat aortic VSMCs.