Optimal etching time of glass ionomer cement for maximum bond of composite resin

Article Abstract:

Glass ionomer cements have assumed an important role in dental practice. They are effective, release more fluoride than silicate cements, and can reduce enamel solubility by as much as 52 percent. A study was conducted to compare the bonding strength of glass ionomer with composite resin between two different surfaces that had undergone different degrees of etching. Forty-eight glass ionomer samples were divided into two groups. The first group was prepared with a glass-smooth surface; the second group was prepared by smoothing the surface with a teflon instrument while the glass ionomer was still in the fluid state. Each group was divided into four subgroups. One subgroup was not etched, the other three subgroups were etched for 15, 30 and 60 seconds, respectively. It was determined that a composite resin will not bond to an unetched, glass-smooth glass ionomer. Since the bond between a composite resin and a glass ionomer is a mechanical one, the bond is enhanced by surface roughness. Disturbing the surface with an instrument produces more roughness than etching a smooth surface. However, the study revealed that for instrument-disturbed surfaces, the bonds were strongest in the subgroup that was not etched and in the group that was etched for 15 seconds. There was a slight decline for the subgroups etched for 30 and 60 seconds. The authors cannot account for this decline, and speculate that it may be a result of the glass ionomer becoming less retentive as a result of the loss of some of its surface particles. (Consumer Summary produced by Reliance Medical Information, Inc.)

Research, Dental materials

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The glass ionomer cement

Article Abstract:

Dentistry has been revolutionized in the last 10 years by the development of new dental materials, but glass ionomer cement may be the most important product. This material has several advantages. It is the only proven dental adhesive, which means that it shows true adhesion to enamel and dentin in laboratory tests simulating conditions in the mouth. Its adhesive bonding does not diminish with time and the cement is compatible with the human body. Its built-in fluoride release mechanism will no doubt work to prevent caries (tooth decay). Glass ionomer cement originally found much more limited use than it does now. The January 1990 issue of The Journal of the American Dental Association is devoted to discussions of types of glass ionomer cements and their uses in clinical practice. (Consumer Summary produced by Reliance Medical Information, Inc.)

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Surface antibacterial properties of glass ionomer cements used in atraumatic restorative treatment

Article Abstract:

Antibacterial properties of glass isonomer cements (GIC)and a zinc oxide eugenol (ZOE) for atraumatic restorative treatment (ART) were evaluated in vitro. The test microorganisms were Streptococcus mutans, Actinomyces viscosus and Enteroccoccus faecalis. Freshly prepared GIC's used in ART exhibited antibacterial effects against cariogenic bacteria for at least a week, but further studies on long-term antimicrobial effects of GICs is required.

United States, Product information, Care and treatment, Usage, Testing, Bacterial growth, Ionomers, Clinical report

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