Glass Ionomer Cements: Chemistry of Erosion

Crisp, Stephen; Lewis, B.; Wilson, Alan D.

doi:10.1177/00220345760550060501

Cited by 87 publications

(41 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This was found to be in good agreement with the literature [21,46]. Wilson noted that higher molar mass cements failed with marked plastic deformation, while lower molar mass cements failed in a brittle fashion [21], confirming the Edwards model.…”

Section: Effect Of the Paa Molar Masssupporting

confidence: 87%

“…The strength of CGPCs increases quickly in the early stages of the reaction, within the first few days of maturation, and then increases at a slower rate over the following year [45,46]. It was first postulated by Crisp and Wilson [44] that this hardening process is based on the gelation of the polymeric acid by cross-linking, or forming inter-and intramolecular salt bridges, of the polymeric carboxyl groups with Al 3+ and Ca 2+ from the glass phase.…”

Section: The Role Of Paa During Cgpc Maturationmentioning

confidence: 99%

“…It was first postulated by Crisp and Wilson [44] that this hardening process is based on the gelation of the polymeric acid by cross-linking, or forming inter-and intramolecular salt bridges, of the polymeric carboxyl groups with Al 3+ and Ca 2+ from the glass phase. Later in 1976, Crisp et al [46] attributed the increase in strength with time up to 1 year, to an increase in cross-link density. Crisp's conclusions were later confirmed by Matsuya et al [45], who used infrared (IR) spectroscopy and nuclear magnetic resonance (NMR) to show that an increase in cross-link density was the reason for increased strength.…”

Section: The Role Of Paa During Cgpc Maturationmentioning

confidence: 99%

“…PAA concentration < 38% w/w resulted in no effects on the P:L ratio. Working time [38][39][40][41][42][43][44][45][46][47][48][49][50] Within this active region, increasing the PAA concentration decreased the working time. This corresponds to the increased viscosity of the cement.…”

Section: Active Region Commentmentioning

confidence: 99%

See 3 more Smart Citations

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

Alhalawani

Curran

Boyd

et al. 2015

Journal of Polymer Engineering

View full text Add to dashboard Cite

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.

show abstract

Section: Effect Of the Paa Molar Masssupporting

confidence: 87%

Section: The Role Of Paa During Cgpc Maturationmentioning

confidence: 99%

Section: The Role Of Paa During Cgpc Maturationmentioning

confidence: 99%

Section: Active Region Commentmentioning

confidence: 99%

See 2 more Smart Citations

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

Alhalawani

Curran

Boyd

et al. 2015

Journal of Polymer Engineering

View full text Add to dashboard Cite

show abstract

“…Hence, they are free to move in and out of the cement. 6 Thus, GIC is considered to be a fluoride reservoir, maintaining a steady flow of fluoride ions into the surrounding tooth structure and enhancing resistance to caries attack throughout the life of the restoration. 7 In-vitro studies have shown that glass-ionomer cements can serve as rechargeable reservoirs, delivering a constant low level of fluoride due to uptake from fluoridated solutions, dentifrices and mouthwashes.…”

Section: Introductionmentioning

confidence: 99%

Fluoride Release From a New Glass-ionomer Cement

Neelakantan

John²,

Anand³

et al. 2011

Operative Dentistry

View full text Add to dashboard Cite

This study compared the amount and pattern of fluoride release from a new glass-ionomer-based material (nano-ionomer) with other restorative materials and correlated the surface area to volume of nano-sized filler with its capacity to release fluoride in the powder, more quickly increasing the fluoride. The materials evaluated were a nano-ionomer (Ketac N 100), a conventional glass-ionomer cement (GC Fuji II), a resinmodified glass ionomer cement (GC Fuji II LC), a compomer (Dyract F) and a fluoride-releasing resin composite (Tetric N Flow). A resin composite (Synergy Flow) served as the control. Ten specimens were fabricated from each of these materials using a customized metal mold. The fluoride release was measured every 24 hours for the first seven days, and on days 14, 21 and 28, a combination fluoride ion-selective electrode connected to an ion analyzer. The data was analyzed by one-way ANOVA and Tukey HSD test (p=0.05). An initial fluoride "burst effect" was seen with all of the materials, except for the control and compomer. The conventional glassionomer cement showed the highest fluoride release on the first three days. The nano-ionomer showed the maximum release of fluoride for the remaining days. A low constant level of fluoride release was seen from the compomer and fluoride-releasing resin composite throughout the study period.

show abstract

An evaluation of mechanical property and microstructural development in HAP-Ca polycarboxylate biocomposites prepared by hot pressing

Greish¹,

Brown²

2000

J. Biomed. Mater. Res.

View full text Add to dashboard Cite

A hot-pressing technique was used to prepare composites anticipated to be biocompatible. Ca(4)(PO(4))(2)O (TetCP) was reacted with an acrylic-itaconic copolymer (CoP) in the absence of a solvent to form composites comprised of Ca(10)(PO(4))(6)(OH)(2') (hydroxyapatite, or HAp) and the Ca polyalkenoate salt. The effect of temperature, pressure, and hot-pressing time on the mechanical properties and microstructure of the composites were studied. Results showed that both tensile strength and elastic modulus increased when temperature and time were increased. When the compaction pressure was increased, these properties initially increased but decreased at high pressures. These variations in the mechanical properties were correlated with the microstructure of these composites. The mechanism of the reaction was also studied. Reaction starts when the copolymer is heated to above its T(g) permitting it to flow and react with the TetCP grains. The COOH groups on the polymer are neutralized by Ca(2+) ions liberated from the TetCP. At the end of reaction, a network of the Ca polyalkenoate salt is formed in which HAp crystals are embedded.

show abstract

Glass Ionomer Cements: Chemistry of Erosion

Cited by 87 publications

References 16 publications

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

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

Fluoride Release From a New Glass-ionomer Cement

An evaluation of mechanical property and microstructural development in HAP-Ca polycarboxylate biocomposites prepared by hot pressing

Contact Info

Product

Resources

About