Glass ionomer cements: Effect of strontium substitution on esthetics, radiopacity and fluoride release

Shahid, Shamsuddin; Hassan, U.; Billington, R.W.; Hill, Robert G.; Anderson, Paul

doi:10.1016/j.dental.2013.12.003

Cited by 52 publications

(31 citation statements)

References 11 publications

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“…Apart from the release of fluoride, the strontium release is regarded as particularly important for the anti-cariogenic properties of glass ionomer materials, since it has been shown that the re-mineralizing effect of fluoride is enhanced by the presence of strontium. 43 The fluoride release from the glass ionomer material is higher where some or all the calcium is replaced by strontium. 43 The presence of a large number of different ions in glass-ionomer-based materials makes them able to release the majority of these ions, besides fluoride, to the immediate surroundings.…”

Section: Discussionmentioning

confidence: 99%

Characterization of glass ionomer cements stored in various solutions

Petrović¹,

Marković²,

Kojić³

et al. 2019

Mater. Tehnol.

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The aim of this work was to evaluate the nano-mechanical properties of glass ionomer materials, the ion concentrations at the surfaces in relation to the storage media and the pH environments using a scanning electron microscope with an energy-dispersive spectrometer (SEM/EDX). The glass-ionomer-based materials, Fuji Triage (FT), Fuji VIII (FVIII), Fuji IX GP (FIX), were analyzed. The sample comprised 45 cured cement disks. Five specimens of each tested material were placed in 3 storage solutions (saline, acidic solution with pH of 5.5, NaF solution with 0.05 % of fluoride). Nano-indentations were performed with a force up to 30 mN, penetration depths of 2500-2700 nm for 1 d and 21 d after setting. The EDX evaluation was carried out for each experimental disk, identifying the ions: O, Al, Sr, Si, F, Na, P, Ca. The level of significance was placed at p < 0.05.The highest fluoride proportion at the specimen surface was recorded in the FT material. FT also exhibited the lowest fluoride ions content when stored in low-pH environments compared with the other tested materials (p < 0.05). The surface hardness of the tested materials decreased from 1.377 GPa (in saline) to 0.03 GPa (in acid). The Young's modulus varied from 14.35 GPa to 0.112 GPa, depending on the material type (Fuji VIII>Fuji IX>FT) (p < 0.001) and the storage media (p < 0.001). Both the mechanical and cariostatic surface properties of commercially available glass ionomer materials are affected by the storage media.Namen predstavljenega dela je bil ovrednotiti nanomehanske lastnosti ionomerskih steklenih materialov, ki slu`ijo v zobni protetiki kot razna polnila. Koncentracijo ionov na povr{ini v povezavi z medijem za shranjevanje s specifi~nim pH okoljem so okarakterizirali tudi z uporabo vrsti~nega elektronskega mikroskopa s prigrajenim energijskim disperzijskim spektroskopom (SEM/EDX). Analizirali so naslednje materiale na osnovi steklenih ionomerov: Fuji Triage (FT), Fuji VIII (FVIII) in Fuji IX GP (FIX). Vzorci so vsebovali 45 vulkaniziranih cementnih diskov. Po pet (5) vzorcev vsakega preiskovanega materiala so vstavili v tri (3) razli~ne raztopine za shranjevanje (slano vodo, kislo raztopino s pH 5,5 in raztopino NaF s 500 ppm fluorida). Po postavitvi vzorcev so izvedli nanoindentacije (vtiskovanje nanopiramide) na vzorcih s silo do 30 mN in nastala je globina vtiska od 2500 do 2700 nm. Tako pripravljeni vzorci so se nato nahajali v raztopinah od enega (1) do enaindvajset (21) dni. Z EDX so dolo~ili ione: O, Al, Sr, Si, F, Na, P in Ca na vseh eksperimentalnih diskih. Nivo pomembnosti so postavili na p<0,05. Najve~ji dele`fluorida so zaznali na vzorcu iz FT. Ta vzorec je prav tako pokazal najni`jo vsebnost fluoridnih ionov, ko je bil shranjen v okolju z nizkim pH v primerjavi z drugimi preiskovanimi materiali (p<0,05). Trdota vzorcev na povr{ini je padala od slanice z 1,377 GPa na 0,03 GPa v kislem mediju. Youngov modul je variiral od 14,35 GPa do 0,112 GPa, odvisno od vrste materiala (Fuji VIII>Fuji IX>FT) (p<0,001) in medija za shranjevanje (p<0...

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Section: Discussionmentioning

confidence: 99%

Characterization of glass ionomer cements stored in various solutions

Petrović¹,

Marković²,

Kojić³

et al. 2019

Mater. Tehnol.

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“…In fact, glass ionomer-based materials have been widely used in restorative dentistry since 1972 (18). One of the disadvantages of the early glass ionomers was that they lacked suitable radiopacity, which made it difficult to radiographically differentiate any recurrent caries from the restoration (19). Because of this insufficiency, manufacturers improved glass ionomer-based materials by incorporating fillers or by using radiopaque compounds to enhance the degree of radiopacity.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of radiopacity of resin-based and glass ionomer-based bulk-fill restoratives using digital radiography

Yaşa

Küçükyılmaz

Yaşa

et al. 2015

Journal of Oral Science

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This study investigated the radiopacity values of glass ionomer-and resin-based bulk-fill restoratives of different thicknesses using digital radiography. Two glass ionomer-based and three resin-based bulk-fill restoratives, and a conventional composite were studied. Five disc-shaped specimens were prepared from each of these materials at three different thicknesses; specimens of enamel and dentin with the same thicknesses were also prepared. Materials were placed over a complementary metal oxide-semiconductor sensor together with the tooth specimen and an aluminum step-wedge, and then exposed using a dental X-ray unit. The images were analyzed using a software program to measure the mean gray values (MGVs), which were converted to equivalent aluminum thicknesses. Two-way ANOVA was used to investigate the significance of differences among the groups. The GCP Glass Fill specimens showed the lowest radiopacity values, and the Quixfil specimens had the highest values. All materials had higher radiopacity values than enamel and dentin, except for GCP Glass Fill, which had a radiopacity similar to that of enamel. The resin-based bulk-fill restoratives had significantly higher radiopacity values than glass ionomer-based restoratives. All of the tested materials showed radiopacity values higher than that of dentin, as recommended by the ISO. (J Oral Sci 57, 79-85, 2015)

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“…The GICs continue to harden over time, leading to the formation of silicate or phosphate networks [19]. Because the electronic structure of Sr is very similar to that Ca, several Ca-containing glasses have been replaced with Sr-containing ones in some GIC products to enhance their radiopacity [20]. In this study, the release of Ca was observed only for CDR, a recently developed Ca-containing product for remineralizing and strengthening the tooth substrate.…”

Section: Discussionmentioning

confidence: 92%

Protective Effects of GIC and S-PRG Filler Restoratives on Demineralization of Bovine Enamel in Lactic Acid Solution

Kaga¹,

Nagano-Takebe²,

Noji³

et al. 2020

Preprint

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We investigated the protective effects of glass ionomer cement (GIC) and surface pre-reacted glass ionomer (S-PRG) fillers used as dental restorative materials on the demineralization of bovine enamel during the incubation in a lactic acid solution with pH = 4.0 conducted for 6 d at a temperature of 37 °C. Scanning electron microscopy images of the specimen surfaces from the group containing only enamel blocks revealed the presence of apparent enamel prism peripheries after 6 d of treatment. The mineral was etched from the enamel surface, and a large number of Ca ions were detected in solution. In contrast, the enamel blocks incubated together with discs of GIC or S-PRG fillers did not exhibit demineralized surfaces, owing to the neutralization of the acid solution by the fillers within the first 3 h of the incubation process. The observed pH neutralization effect was attributed to the release of different ions from the fillers and could be utilized for suppressing the progression of caries.bioactive materials before employing a restorative approach that requires the removal of tooth tissue [7].The main purpose of developing bioactive and antibacterial materials is to prevent damage of hard tissues. Glass ionomer cements (GICs) have been widely used for the conservative treatment of enamel and dentin because of their beneficial properties such as strong chemical bonding to the tooth substrate and release of fluoride ions [8]. Furthermore, while conventional GICs release the ions of their constituent materials, light-cured GICs produce significant amounts of Al, Ca, F, Na, P, Si, and Sr ions in neutral or acidic solutions over time and can effectively neutralize lactic acid solutions [9,10] to prevent demineralization of the areas adjacent to the tooth surface and suppress the formation of initial caries.A few years ago, a new zinc-containing GIC characterized by a higher flexural strength as compared with those of conventional GICs was developed [11]. However, after two years of clinical trials, it was found to be unsuitable for cavity preparation [12]. Meanwhile, surface pre-reacted glass ionomer (S-PRG) fillers were introduced as bioactive materials that were able to retain their basic properties by forming a stable glass ionomer phase on the treated surface through the acid-base reaction between the fluoro-boro-alumino-silicate glass and polyacrylic acid [13]. These fillers represent a novel class of particle materials that can be incorporated into resin matrices to induce the release of different types of ions and thus produce a strong bioactive effect. The results of in-vitro studies demonstrated the effectiveness of such materials in inhibiting the demineralization of the tooth substrate [14][15][16] and preventing the initiation of caries. In addition, an endodontic root canal sealer containing an S-PRG filler (i.e., S-PRG sealer) exhibited good antibacterial and anti-inflammatory properties. Finally, the implantation of S-PRG sealer into the subcutaneous tissues of rats noticeably decreased their inflamma...

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Glass ionomer cements: Effect of strontium substitution on esthetics, radiopacity and fluoride release

Cited by 52 publications

References 11 publications

Characterization of glass ionomer cements stored in various solutions

Characterization of glass ionomer cements stored in various solutions

Comparative study of radiopacity of resin-based and glass ionomer-based bulk-fill restoratives using digital radiography

Protective Effects of GIC and S-PRG Filler Restoratives on Demineralization of Bovine Enamel in Lactic Acid Solution

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