The physico-mechanical consequences of exposing glass ionomer cements to water during setting

Causton, B.E.

doi:10.1016/0142-9612(81)90008-9

Cited by 83 publications

(30 citation statements)

References 9 publications

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“…18,20 Conversely, water adsorption can remove the ions and tamper with the physical properties of the material. 21,22 The water sorption test showed difference among GIC evaluated, which was inversely proportional to the weight of powder per portion presented in the composition of the materials. The absorption of water molecules results in loss of monomers and other small molecules.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of the relationship between the cost and properties of glass ionomer cements indicated for atraumatic restorative treatment

et al. 2016

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The aim of this study was to evaluate microshear bond strength (μSBS), water sorption and solubility of glass ionomer cements (GIC) indicated for atraumatic restorative treatment (ART). Cylindrical specimens (6x2.4 mm) were used to test the sorption and solubility of each GIC (n = 5). The specimens were weighed before and after immersion in water and desiccation. For the μSBS test, 60 primary molars were ground to obtain flat surfaces from both enamel and dentin. The teeth were then assigned to the tested GIC (n = 10) groups, namely Fuji IX -FIX, Ketac Molar -KM and Maxxion R -MX. The exposed surfaces were pre-treated with GIC liquid. Polyethylene tubes were placed on the pre-treated surface and filled with one of the GIC. After 24 h, the specimens were submitted to the μSBS test. The failure mode was assessed using a stereomicroscope (400x magnification). The powder to liquid ratio and cost of material were also determined (n = 3). The data were analyzed by ANOVA and Tukey's post hoc test. Linear regression was used to determine the relation between cost and the other variables. Overall, MX showed lower μSBS values (enamel: 3.93 ± 0.38; dentin: 5.04 ± 0.70) than FIX (enamel: 5.95 ± 0.85; dentin: 7.01 ± 1.06) and KM (enamel: 5.91 ± 0.78; dentin: 6.88 ± 1.35), as well as higher sorption and solubility. The regression analyses showed a significant and positive correlation between cost and μSBS in enamel (R 2 = 0.62; p < 0.001) and dentin (R 2 = 0.43; p < 0.001); and a negative correlation between cost and water sorption (R 2 = 0.93; p < 0.001) and solubility (R 2 = 0.79; p < 0.001). In conclusion, the materials indicated for ART exhibit distinct physical and mechanical properties; in addition, low-priced materials may interfere with GIC properties.

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Section: Discussionmentioning

confidence: 99%

Evaluation of the relationship between the cost and properties of glass ionomer cements indicated for atraumatic restorative treatment

et al. 2016

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“…Ion release takes part in the formation of the cement matrix and contributes to the therapeutic activity, giving these materials the potential to be used for various clinical applications. The fluoro-alumino-silicate glass-based CGPCs are known for their sustained release of clinically beneficial amounts of fluoride [51,141,142], as shown by Wilson et al [143], who found that the release of fluoride continued for at least 18 months. Fluoride plays an important biological role, particularly in dentistry, and has the effect of improving the resistance of the tooth material to acid attack, decreasing demineralization and increasing remineralization, inhibiting dental decays, and making the cement translucent [144][145][146].…”

Section: Ion Releasementioning

confidence: 99%

“…The flexural strength of Opus-fil (Davis Schottlander & Davis Ltd., Letchworth, Herts, UK), a conventional restorative GPC, increased to 73 MPa at 56 days, and then decreased to 53 MPa after 100 days of maturation. This phenomenon of decreasing the strength of some GPC formulations with maturation has been attributed to hydration of the ionic bonds within the cement matrix resulting in the loss of matrix-forming ions into solution, and consequently decreasing the integrity of the GPC [50,51]. This phenomenon has also been attributed to the erosion and the plasticizing effect of water on these materials and to the slower rate of the reaction, as the cement ages in aqueous solution, resulting from the lesser number of COOH groups available to form ionic bonds [35,52].…”

Section: The Role Of Paa During Cgpc Maturationmentioning

confidence: 99%

The role of poly(acrylic acid) in conventional glass polyalkenoate cements

Alhalawani

Curran

Boyd

et al. 2015

Journal of Polymer Engineering

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Abstract Glass polyalkenoate cements (GPCs) have been used in dentistry for over 40 years. These novel bioactive materials are the result of a reaction between a finely ground glass (base) and a polymer (acid), usually poly(acrylic acid) (PAA), in the presence of water. This article reviews the types of PAA used as reagents (including how they vary by molar mass, molecular weight, concentration, polydispersity and content) and the way that they control the properties of the conventional GPCs (CGPCs) formulated from them. The article also considers the effect of PAA on the clinical performance of CGPCs, including biocompatibility, rheological and mechanical properties, adhesion, ion release, acid erosion and clinical durability. The review has critically evaluated the literature and clarified the role that the polyacid component of CGPCs plays in setting and maturation. This review will lead to an improved understanding of the chemistry and properties of the PAA phase which will lead to further innovation in the glass-based cements field.

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“…The volume (V) of each specimen was calculated in cubic millimeters. The water sorption (WS) was determined using the following equation: WS=(M 1 -M 2 )/ V. The values were expressed in mg/mm 3 . Data were subjected to one-way analysis of variance (ANOVA) and a Tukey test for multiple comparisons (p<0.05).…”

Section: Water Sorption Testmentioning

confidence: 99%

Diametral tensile strength and water sorption of glass-ionomer cements used in Atraumatic Restorative Treatment

et al. 2003

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he purposes of this study were to evaluate the diametral tensile strength and the water sorption of restorative (Fuji IX and Ketac Molar) and resin-modified glass-ionomer luting cements (ProTec Cem, Fuji Plus and Vitremer) mixed at both manufacturer and increased powder: liquid ratio, for their use in the Atraumatic Restorative Treatment. A conventional restorative glass-ionomer (Ketac Fil) was used as control. Specimens (6.0 mm in diameter x 3.0 mm in height) were prepared and stored (1 hour, 1 day and 1 week) for a diametral tensile strength test. Data were subjected to two-way ANOVA and Tukey tests (p<0.05). For the water sorption test, specimens of 15.0 mm in diameter x 0.5 mm in height were prepared and transfered to desiccators until a constant mass was obtained. Then the specimens were immersed in deionized water for 7 days, weighed and reconditioned to a constant mass in desiccators. Data were subjected to one-way ANOVA and Tukey tests (p<0.05). Five specimens of each studied material and consistency were prepared for each test. The resin-modified glass-ionomer cements showed significantly higher strength than the conventional materials. Except for ProTec Cem, the diametral tensile strength of the resinmodified materials significantly increased from luting to restorative consistency. Except for ProTec Cem, the water sorption of the resin-modified glass ionomers was higher than the others. The water sorption of resin-modified materials at restorative consistency was significantly lower than at luting consistency. Resin-modified glass-ionomer luting cements mixed at increased powder: liquid ratio showed better properties than at luting consistency.

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The physico-mechanical consequences of exposing glass ionomer cements to water during setting

Cited by 83 publications

References 9 publications

Evaluation of the relationship between the cost and properties of glass ionomer cements indicated for atraumatic restorative treatment

Evaluation of the relationship between the cost and properties of glass ionomer cements indicated for atraumatic restorative treatment

The role of poly(acrylic acid) in conventional glass polyalkenoate cements

Diametral tensile strength and water sorption of glass-ionomer cements used in Atraumatic Restorative Treatment

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