Long-term mechanical characteristics of resin-modified glass ionomer restorative materials

Uno, Shigeru; Finger, Werner J.; Fritz, Ulrike

doi:10.1016/s0109-5641(96)80066-2

Cited by 90 publications

(54 citation statements)

References 6 publications

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“…These materials were enhanced to overcome the problems of low initial mechanical strength and moisture sensitivity associated with conventional cements, while preserving their clinical advantages such as self-adhesion to dental tissues and fluoride release. These new materials were classified as resin-modified glass-ionomers [6][7][8] . Resin-modified glass-ionomer cements have two setting mechanisms: the acid-base setting reaction and polymerization reaction 9) .…”

Section: Introductionmentioning

confidence: 99%

“…This latter reaction can occur due to the self-cure mode of the resin phase and/or it can occur by light activation. Compared with conventional analogs, resin-modified glass-ionomer cements have been characterized as having a longer working time, a rapid set, improved appearance and translucency, and higher early strength 8,10) . In particular, a remarkable feature of these materials is that they can be finished and polished on the same visit 11) .…”

Section: Introductionmentioning

confidence: 99%

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Effectiveness of surface protection for glass-ionomer, resin-modified glass-ionomer and polyacid-modified composite resins

Karaoğlanoğlu¹,

Akgül²,

Özdabak³

et al. 2009

Dent. Mater. J.

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The purpose of this study was to evaluate the effectiveness of several surface protectors for a glass-ionomer, a resinmodified glass-ionomer, and a polyacid-modified resin cement by determining dye uptake spectrophotometrically. 378 samples, made up of Ionofil U, Vitremer, and Dyract, were prepared and divided into groups of seven each. Positive and negative control specimens remained unprotected while the experimental specimens were protected with Finishing Gloss, Protect-It, LC Varnish, Adper Single Bond, or a nail varnish. The experimental groups and positive controls were immersed in 0.05% methylene blue solution, while the negative controls were immersed in deionized water. Results were evaluated using variance analysis. Of the Ionofil U group, Adper Single Bond exhibited the least effective surface coating among the materials tested, while the best surface protection was obtained with LC Varnish in the Dyract group. However, no statistically significant differences were observed in the Vitremer group.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effectiveness of surface protection for glass-ionomer, resin-modified glass-ionomer and polyacid-modified composite resins

Karaoğlanoğlu¹,

Akgül²,

Özdabak³

et al. 2009

Dent. Mater. J.

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“…Uno found that there were differences in the times needed to reach a maximum level of strength for the resinmodified glass ionomers, and suggested that the reasons might be the maturation of the acid-base reaction. 41 Despite the improvement in the surface resistance to erosion, stresses could build up in the glass particles-resin matrix interfaces, and early immersion into artificial saliva and subsequent APF gel application may help to propagate any cracks.…”

Section: Researchmentioning

confidence: 99%

Fluoride release, weight loss and erosive wear of modern aesthetic restoratives

1999

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265 RESEARCHrestorative dentistry limited the scope of conventional GICs in clinical application. More recently-introduced resin ionomers have less water sensitivity, and improved aesthetic and mechanical properties. 11 However, there are great differences between various materials in the levels of fluoride released, 12 and there is also less fluoride released when artificial 13 and human saliva 14 are used, rather than deionised water. Some materials claimed by their manufacturers to release fluoride hardly do so in measurable quantities. 15 In fact, a variety of such fluoride-releasing materials are primarily resin-composite systems with some form of fluoride incorporated into the resin matrix. 16 Most of these materials have a lower level of fluoride release than GICs, and their clinical effectiveness is also unknown.Therefore, the objectives of this study were to investigate the long-term levels of fluoride released from selected GICs and resin ionomers, and the effects of acidulated phosphate fluoride (APF) gel on the levels of fluoride released and on the physical structure of the glass ionomer cements, by monitoring their weights and surface changes. Materials and methods Restorative materialsThe details of the materials investigated in the present study are listed in Table 1. ChemFil Superior was the positive control and Z100 was the negative control. Specimen preparation and immersionFive specimens of each material were prepared according to the manufacturers' instructions and placed into disposable, cylindrical Teflon moulds (3.0 mm diameter × 2.7 mm height), 17 and then pressed between two Mylar-covered glass slides. The resin ionomer cements were light cured from both ends of the moulds for 40 seconds using a VCL 200 visible light unit (Demetron Research Corporation, Danbury, CT, USA). They were allowed to set for about an hour. After setting, each specimen was removed from its mould, weighed by an electronic balance, then placed in a polypropylene vial with 2 mL of artificial saliva (0.05 M acetate buffer with 2.2 mM CaHPO 4 adjusted with glacial acetic acid to pH 5.0) and stored at 37°C. The solution was replaced at 6 hours, 1 day and 2 days, then weekly for 12 weeks. The amount of fluoride released was also measured at these same times for the first 5 weeks, then at 8 weeks and 12 weeks. Each specimen was dabbed dry before weighing at the times of solution replacement. Determination of fluorideOne mL of the solution was mixed with 0.1 mL of TISAB III solution and the fluoride concentration was measured with a specific fluoride electrode (Orion 9609BN electrode: Orion Research Incorporated, Boston, MA, USA) and read in millivolts. Calibration of the fluoride electrode was done before each measurement session Objective In this investigation, the in vitro sustained fluoride release, weight loss and erosive wear of three conventional glass ionomer cements (Fuji IX, ChemFil Superior, Ketac-Silver), three resin-modified glass ionomer cements (Fuji II LC, Vitremer, Photac-Fil), a polyacid-modified resin ...

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“…The final set material has a complex structure in which glass particles are sheathed in a matrix consisting of two networks -one derived from the glass ionomer and the other from the resin 2,3) . With such a dual-setting system, the resin reinforcement provides higher mechanical strength 4,5) and higher bond strength to the tooth surfaces 6,7) . The mechanical properties of RMGICs are superior to those of CGICs 5,6) in that the weak organic-salt matrix of GICs is strengthened by a modification of the resin system -as in methacrylate-modified systems.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of a resin-modified glass ionomer cement for luting: effect of adding spherical silica filler

et al. 2010

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This study investigated the effects of spherical silica filler (SSF) on the workability and mechanical properties of resin-modified glass ionomer cements for luting (RMGICL). Varying powder/liquid ratios (P/L=2.0, 2.2, 2.4, and 2.6) of a commercially available glass ionomer cement (Fuji Lute, GC Corp.) were mixed with SSF at different weight percentages (5, 7.5, and 10%). On film thickness, statistically significant effects of SSF addition were noted at 2.5 minutes after mixing started, notably at P/L=2.4 and 2.6 when 7.5 and 10 wt% of SSF were added. The same result was also obtained for consistency evaluation. On mechanical and bonding strengths to the tooth substrate, no statistically significant differences were observed among all the SSF weight percentages within each P/L ratio. SSF-added RMGICL at a higher powder/liquid ratio exhibited increased mechanical and bonding strengths when compared to a control without SSF addition, but nonetheless maintained the film thickness with no further increase.

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Long-term mechanical characteristics of resin-modified glass ionomer restorative materials

Cited by 90 publications

References 6 publications

Effectiveness of surface protection for glass-ionomer, resin-modified glass-ionomer and polyacid-modified composite resins

Effectiveness of surface protection for glass-ionomer, resin-modified glass-ionomer and polyacid-modified composite resins

Fluoride release, weight loss and erosive wear of modern aesthetic restoratives

Mechanical properties of a resin-modified glass ionomer cement for luting: effect of adding spherical silica filler

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