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At least 19 recordsLinked to original sources
PubMed1979

Experimental secondary caries around amalgam, composite and glass ionomer cement fillings in human teeth.

It was the aim of this in vitro study to examine secondary caries occurring in enamel and dentin adjacent to different filling materials and after different filling methods. The materials used were: amalgam, composite and glass ionomer cement. The highest rate of secondary caries was found on the crown surface as well as root surface of teeth which were conventionally treated with amalgam and composite materials. The preliminary treatment with a copal-ether varnish (Copalite) was of insignificant value. Fluoridation of the cavity walls with a fluoride solution (Elmex-Fluid) resulted a significant cariostatic effect with amalgam- or composite fillings in enamel and in root surfaces. Zones of inhibition of demineralization could be found. The addition of 5% NaF to composite material also produced an inhibition of demineralization, manifesting itself in a reduction of the secondary caries rate and increased percentage of tight margins of the fillings. Although glass ionomer cement has adherent properties to enamel and dentin, a larger percentage of filling-margins, especially of those applied to dentin, were found to be untight. Nevertheless, the demineralizations were not very pronounced and significant zones of inhibition of demineralization were found in the cavity walls and tooth surfaces adjacent to the fillings. The amounts of fluoride released by silicate cement, glass ionomer cement and composites containing 5% NaF were compared. The glass ionomer cement showed higher values than the composite and silicate materials. After 10 days of storage in water, the dosis of fluoride released--by all materials--was 7-20 times less than on the first day.

Acrylic Resins↗
PubMed1979

Biological evaluation on glass ionomer cement.

Biological properties of a new dental cement of glass ionomer cement were compared with other types of conventional cement. The biological test was carried out by tissue culture method and animal examination. The culture cells showed weaker reaction to the glass ionomer cement than zinc oxide-eugenol or polycarboxylate cement. Pulp tissue reaction showed no significant difference between glass ionomer and zinc oxide-eugenol cement from in vivo experiments using monkeys.

Acrylic Resins↗
PubMed1979

Clinical evaluation of a glass ionomer cement for restoration of cervical erosion.

The following conclusions can be made: A glass ionomer cement mixed in preweighed capsules to restore anatomically deficient cervical contours demonstrated bonding of the total restoration to tooth tissue without undercutting or pinning the tooth or relying on geometric design of a cavity preparation in approximately 95% of 113 restorations observed postoperatively for six months. Seven restorations showed partial loss of material. Seven of the 113 restorations, showed some marginal discoloration although no stain penetrated the interface of the tooth and restoration. For most cervical restorations, the glass ionomer cement produced a mismatch in "color, shade, and/or translucency" in relationship to the tooth. The probable reason for this is the opacity of the cement. An acceptable surface of the glass ionomer cement restorations can be established at a later finishing appointment. There is little evidence that roughness increased slightly during the six months. Patients' sensitivity to temperature and direct tactile contact diminished or was eliminated after placement of the restoration.

Acrylic Resins↗
PubMed2025

Genome wide association study of rice agronomical traits and seed ionome with the NARO Open Rice Collection.

To meet the nutritional needs of the rising human population, genetic variants are necessary for the breeding of new cultivars. Rice (Oryza sativa L.) is a staple food for over half of the world's population. Here, we developed a new rice genetic resource, the NARO Open Rice Collection (NRC) with high-resolution genome data. NRC consists of 623 accessions, and approximately 200 accessions are categorized into three major subgroups, categorized as Indica, Japonica, and Aus. In this study, we performed genome-wide association studies (GWAS) for rice heading date, seed shape, and seed ionome using the NRC. Well-known genes related to heading date and seed shape were detected by GWAS using the NRC accessions. Therefore, we concluded that our new rice collection is suitable for GWAS. In addition, GWAS with each subgroup was advantageous for the detection of particular genes. Finally, we performed GWAS for seed ionome with the aim of improving the nutritional properties of rice, as essential minerals for humans, such as iron (Fe) and zinc (Zn), are not sufficient in rice seeds. Our study revealed that OsATL31, a likely ubiquitin E3 ligase, was involved in the control of Fe and Zn contents in seeds.

Oryza↗
PubMed1977

Fluoride release from a glass ionomer cement.

The release of fluoride from a glass ionomer cement (ASPA) was compared with that from a silicate cement. Test specimens were shaken in a solution with hydroxyapatite for 7 weeks. The solution was changed every week and the fluoride taken up by the hydroxyapatite measured. The specimens released considerably more fluoride during each of the first 2 weeks than during each of the subsequent 5 weeks. The continued release did not decrease very much with time. Slightly more fluoride was released from the glass ionomer cement than from the silicate.

Dental Cements↗
PubMed1978

Finished surface texture, abrasion resistance, and porosity of Aspa glass-ionomer cement.

1. With the finishing agents tested Concise had a smoother surface texture than Aspa. 2. The smoothest surface was on Concise polymerized against a Mylar matrix strip. The smoothest surface for Aspa was obtained with a silicon carbide disk. 3. Aspa abraded about three times as rapidly by volume as Concise when tested by a two-body abrasion method. 4. Significantly more air bubbles were entrapped by hand mixing within Aspa than within Concise. 5. Controlled clinical studies of the glass-ionomer cements are needed before they can be fully evaluated as restorative materials.

Acrylic Resins↗
PubMed1979

Dowel retention with glass-ionomer cement.

The retentive capacity of the Whaledent Parapost system utilizing ASPA cement was compared at two lengths, three diameters, and with respect to the effect of both medication and citric acid pretreatment. The greatest single factor influencing retention was embedment depth into dentin. No significant differences were observed between the retention values for medicated and unmedicated teeth. Finally, no increase in retention was noted over previously reported values for zinc phosphate, carboxylate, and epoxy resin cements. The glass-ionomer cement tested offers no advantage for post retention.

Acid Etching, Dental↗
PubMed1979

The structure of a glass-ionomer cement and its relationship to the setting process.

The G-200 glass of the glass-ionomer cement has two phases: a continuous calcium aluminosilicate matrix and partly crystalline calcium fluoride-rich droplets, the nature of which depend on the thermal history of the glass. The setting process of the cement takes place when the glass is mixed with poly(acrylic acid). It has two overlapping stages corresponding to the rapid leaching of calcium ions from the uncrystalline part of the droplets, followed by the slower release of aluminum (and some calcium) from the main glass phase. These processes are affected by the microstructure and microcomposition of the glass.

Acrylic Resins↗
PubMed1978

An in vitro study of certain properties of a glass ionomer cement.

A glass ionomer cement was tested for its release of fluoride, effect on solubility of enamel, bond to enamel, and ability to seal the cavity. It was comparable to silicate cement in its release of fluoride and its effect on solubility of enamel. The strength of the bond of the cement to tooth structure was similar to polycarboxylate cement, and it appeared to be quite effective in sealing cavities.

Acrylic Resins↗