Wear and Microhardness of a Silver-sintered Glass-Ionomer Cement

McKinney, John E.; Antonucci, J.M.; Rupp, N.W.

doi:10.1177/00220345880670050701

Cited by 47 publications

(18 citation statements)

References 8 publications

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“…In addition to the above clinical trials, in which glass ionomers were used on occlusal areas, several laboratory studies have been carried out to evaluate the wear properties (McKinney et al, 1987(McKinney et al, , 1988Aziz and Harrison, 1988;Soltesz and Leupolz, 1993a).…”

Section: Introductionmentioning

confidence: 99%

Early and Long-term Wear of Conventional and Resin-modified Glass Ionomers

et al. 1996

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Various studies have shown that glass ionomers are susceptible to brittle fracture and acid conditions and that they undergo long-term changes in their mechanical properties. Little information is available on how brittleness, acid susceptibility, and long-term changes are reflected in the wear characteristics of glass ionomers. The purpose of this study was to evaluate long-term changes in conventional glass ionomers, metal-reinforced glass ionomers (including a cermet), and (light-curing) resinmodified glass ionomers by wear experiments simulating the wear process in occlusal contact-free areas. The wear tests were conducted periodically over a period of one year. In addition, wear was determined after one year at a pH of 5 or 6, for assessment of acid susceptibility, and at a condition as found in the occlusal contact areas. All materials showed high early-wear rates which decreased significantly during the one-year test period. This long-term process may be related to a slow progression of the acid-base reaction extending over several months. At each stage, the resinmodified glass ionomers wore significantly faster than the acid-base setting glass ionomers. Most of these materials were not affected at a pH of 6.0, while at a pH of 5.0 only the conventional and the metal-reinforced glass ionomers showed increased wear. Direct contacts with the antagonist led to a significant increase in wear in comparison with contact-free wear, probably as a result of sub-surface fatigue phenomena. In view of the unfavorable wear characteristics of the resin-modified glass ionomers and the high early wear of the conventional glass ionomers, including the metal-reinforced glass ionomers, it was concluded that none of these materials can yet be recommended for use in high-stress-bearing situations.

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Section: Introductionmentioning

confidence: 99%

Early and Long-term Wear of Conventional and Resin-modified Glass Ionomers

et al. 1996

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“…This material sets to form a cement via an acid-base reaction. 7 By sintering metal particles into the glass phase, it is possible to improve the material's abrasion, 8,9 and to yield a modest increase in diametral tensile strength. 10 The objective of this study was to determine and compare the mechanical properties of various cements used as core build-up materials relative to time after first mixing.…”

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confidence: 99%

Laboratory strength of glass ionomer and zinc phosphate cements

Piwowarczyk¹,

Ottl²,

Lauer³

2001

Journal of Prosthodontics

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Purpose: The present in vitro study examined 3 mechanical properties, namely compressive, flexural, and diametral tensile strength, of various commercially available cements and core materials as a function of time after mixing. Materials and Methods: The examined materials were 2 cermet cements (Ketac Silver [ESPE, Seefeld, Germany] and Chelon Silver [ESPE]), 1 metal-reinforced glass ionomer cement (Miracle Mix [GC Dental Industrial Corp, Tokyo, Japan]), 2 conventional glass ionomer cements (Ketac Bond [ESPE] and Ketac Cem [ESPE]), 1 standard cure zinc phosphate cement (Harvard Cement [Richter and Hoffmann, Berlin, Germany]), and 1 zinc phosphate cement with the addition of 30% silver amalgam alloy powder (Harvard Cement 70% with Dispersalloy 30% [Richter and Hoffmann/ Johnson and Johnson, East Windsor, NJ]). Properties were measured using a universal testing machine at 15 minutes, 1 hour, and 24 hours after first mixing. Results: Compressive strengths varied widely between the 3 times of measurement from 5.8 ؎ 6.6 MPa for Ketac Cem to 144.3 ؎ 10.2 MPa for Ketac Silver. Twenty-four hours after mixing, the Bonferroni test showed significant (p < .01) differences between Ketac Silver and all other materials tested. Diametral tensile strengths ranged widely from 4.4 ؎ 0.9 MPa for Ketac Cem to 11.5 ؎ 2.2 MPa for Chelon Silver. At 15 minutes, 1 hour, and 24 hours after first mixing, the analysis of variance did not show any significant differences between Ketac Silver, Chelon Silver, and Miracle Mix. The 3-point flexural strength of Ketac Silver showed, at 15 minutes with 13.5 ؎ 3.9 MPa and at 24 hours with 27.2 ؎ 7.4 MPa, the highest values.Conclusions: Setting time influences the mechanical properties of the materials tested in this study. Ketac Silver, a glass ionomer cement reinforced with sintered glass-silver particles, showed the highest mechanical properties of the examined materials.

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“…According to in vitro studfunction of time {2 -7). Part of the released ies, silver glass ionomers seem to have better fluoride is taken up by the surrounding mechanical properties, lovifer solubility, and greater tolerance for dehydration than conventional glass ionomers (14)(15)(16), but their ability to release fluoride and prevent secondary caries seems to be smaller (7,II,12,17). However, more informadon about different types of materials is needed.…”

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Prevention of enamel demineralization adjacent to glass ionomer filling materials

Forss

Seppä

1990

European J Oral Sciences

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– In order to study the release of fluoride and prevention of enamel demineralization by different filling materials, standardized cavities were prepared in 80 extracted human molars. The cavities were filled as follows: 1. Fuji II F; 2. Ketac‐Fil; 3. Ketac‐Silver; 4. Silar. Twenty molars were used as controls (no filling). Enamel slabs with the fillings were subjected to 9 days of demineralization (30 min daily) and remineralization (artificial saliva, replaced daily). Fluoride release in the saliva was determined on days 1, 3, 5, and 9. Enamel fluoride content adjacent to the cavities was determined initially and after the de‐remineralization using the acid etch technique. On day 1, the largest amount of fluoride in the saliva was released by Fuji, but on day 9 the largest amount was released by Ketac‐Fil. Ketac‐Silver released significantly less fluoride than Fuji and Ketac‐Fil. The average initial fluoride content of enamel was 2200 ppm. After the test period, fluoride contents adjusted for biopsy depth were 1822, 1690, 1693, 1337, and 888 ppm in groups 1‐5, respectively. The amounts of phosphorus dissolved by the second acid etch were 28.9 (SE 2.6), 30.2 (2.0), 34.4 (2.8), 44.1 (2.7), and 42.2 (2.4) μg, respectively. Softening of surface enamel during the test period was clearly reduced in teeth filled with Fuji and Ketac‐Fil. The results show that glass ionomer materials release considerable amounts of fluoride and prevent demineralization of the adjacent enamel in vitro. Fuji and Ketac‐Fil seem to be more effective than Ketac‐Silver.

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Wear and Microhardness of a Silver-sintered Glass-Ionomer Cement

Cited by 47 publications

References 8 publications

Early and Long-term Wear of Conventional and Resin-modified Glass Ionomers

Early and Long-term Wear of Conventional and Resin-modified Glass Ionomers

Laboratory strength of glass ionomer and zinc phosphate cements

Prevention of enamel demineralization adjacent to glass ionomer filling materials

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