The Mechanism for Erosion of Glass-ionomer Cements in Organic-Acid Buffer Solutions

Fukazawa, Mitsuru; Matsuya, Shigeki; Yamane, Masaji

doi:10.1177/00220345900690051001

Cited by 65 publications

(48 citation statements)

References 13 publications

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“…This can cause detachment of metal ion inside hybrid ionomer. 8 The result of this study is in accordance with hypothesis that glass ionomer cement surface hardness (Fuji LC II) can decrease along with the decrease of pH and time. Observation with electron microscope shows that after 5 hours of immersion in citric acid added with artificial saliva pH 3, the microstructure of hybrid ionomer cement does change.…”

Section: Discussionsupporting

confidence: 90%

“…Hybrid ionomer cement can undergo erotion if in contact with acid solution and it affects surface hardness. 8 This study used a conversion of antiseptic solution against hybrid ionomer cement, as follows: hybrid ionomer in contact with antiseptic solution in 1 minute (duration of antiseptic solution for 1 day), 7 minutes (7 days duration of antiseptic solution usage) and 14 minutes (2 weeks duration).Therefore, problems rise in pertaining to surface hardness of hybrid ionomer cement after immersion in acidic antiseptic solution.…”

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confidence: 99%

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Surface hardness of hybrid ionomer cement after immersion in antiseptic solution

Yuliati

Wardani

2006

Dent. J. (Majalah Kedokteran Gigi)

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Section: Discussionsupporting

confidence: 90%

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confidence: 99%

Surface hardness of hybrid ionomer cement after immersion in antiseptic solution

Yuliati

Wardani

2006

Dent. J. (Majalah Kedokteran Gigi)

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“…Some of these craters seem to be the remains of the GS beads. The same effect has been observed by Fukazawa et al 25,26) in the case of the erosion of glassionomer cements. The buffer would dissolve these GS beads gradually leaving a number of pores near the surface of the GS modified cement slabs.…”

Section: ) As a Function Of Elution Time T (H) For A Series Of Unmodsupporting

confidence: 83%

Gentamicin Sulphate Release from a Modified Commercial Acrylic Surgical Radiopaque Bone Cement. I. Influence of the Gentamicin Concentration on the Release Process Mechanism.

Díez-Peña

Frutos

et al. 2002

CHEMICAL & PHARMACEUTICAL BULLETIN

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Chronic osteomyelitis remains as an important and daunting orthopedic and clinical problem. Conventional treatment using systematic antibiotics is often unsuccessful. High systemic levels of aminoglycoside antibiotics also imply the risk of organ toxicity such as hearing or kidney damages. 1)One management method utilizes surgical implantation of antibiotic-impregnated poly(methyl methacrylate) (PMMA) beads into dead space created by osteomyelitic tissue removal, for local delivery of antibiotics. [2][3][4] This method intends to reach high local drug levels while maintaining low systemic levels. Gentamicin sulphate (GS)-PMMA, antibiotic-impregnated or antibiotic-loaded acrylic cements have been used in surgery to prevent or treat osteomyelitis 5) since the 1970s. A great number of studies on the amount and rate of GS release from different commercial acrylic bone cements have been published, but an insight into the mechanism and kinetics of the release process is still lacking. [6][7][8][9][10][11][12] The main aspects on which the present work is based are as follows:(i) There Exist Some Significant Differences in Behavior among the Different Antibiotic Loaded Acrylic Cement: The antibiotic release from these cements has been the subject of numerous studies. Several factors such as trade name, amount and type of antibiotic incorporated, porosity of the system, its specific area, its surface characteristics 13) and some other factors, seem to influence very markedly this release. All these facts have been the reason that the main part of these studies have yield irreconcilable results, which are analyzed with difficulty, and, in some cases, quite selfcontradictory.14-16) These apparent discrepancies require explanation. Therefore we tried to perform a reproducible study from which conclusions about the release properties of bone cements and related devices could be extracted. This information may then be used to modify the formulation in order to improve its release characteristics.(ii) Non Effective Drug Levels: It has been shown in the "in vitro" experiments that much of the antibiotic may be retained within the PMMA matrix, sometimes as much as 90% of the load. 7,9,11,16) (iii) Mechanism and Kinetics for the Precise Control of the Release Process: Due to all the above mentioned, it has not been possible to establish the mechanism and the kinetics of the GS release from commercial acrylic surgical radio opaque bone cement very clearly so far. An essential feature of the acrylic bone cements is shown in experiments carried out in vivo and in vitro by Baker and Greenham,8) who proved that PMMA bone cement that has no defects is impervious to gentamicin. In addition the glass transition of PMMA is far away above room temperature, 17) and therefore from the temperature at which the delivery experiments are carried out. From this point of view the diffusion throughout the polymeric matrix seems to be almost unfeasible.In the present study, special attention has been paid to determine the influence of the amount of...

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“…The free cations diffuse outwards and are released from the surface. As the metal cations in the matrix decreases, more would be extracted from the surrounding glass particles, causing them to 13) . With time, the material presents a roughened surface with voids and protruded, undissolved glass particle resulting in greater water and food colorant absorption 14) .…”

Section: Discussionmentioning

confidence: 99%

Effect of staining solutions on color of pre-reacted glass-ionomer containing composites

et al. 2012

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This study investigated the color stability of pre-reacted glass-ionomer containing composite restoratives. The materials evaluated included one regular (Beautifil II [BF]), two flowable (Beautifil Flow [F02, F10]) and two recently introduced flowable "plus" (Beautifil Flow Plus [F00, F03]) pre-reacted glass-ionomer containing composite restoratives. Twelve specimens of each material (A3 shade) were fabricated, allowed to set for 24 h at 37°C and randomly divided into 4 groups. After baseline spectrophotometric (Crystaleye, Olympus) color measurements, specimens were immersed in water, cola, red wine and coffee for 7 days. Post-immersion color measurements were taken and color changes (ΔE) were computed accordingly. Statistical analysis was done using ANOVA and post-hoc Scheffe's test (p<0.05). For pre-reacted glass-ionomer containing composites, color changes after immersion in coffee and red wine were significantly greater than in cola and water. Differences in ΔE values between materials were solution dependent. The least color change was generally observed with the flowable "plus" pre-reacted glass-ionomer containing composites.

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The Mechanism for Erosion of Glass-ionomer Cements in Organic-Acid Buffer Solutions

Cited by 65 publications

References 13 publications

Surface hardness of hybrid ionomer cement after immersion in antiseptic solution

Surface hardness of hybrid ionomer cement after immersion in antiseptic solution

Gentamicin Sulphate Release from a Modified Commercial Acrylic Surgical Radiopaque Bone Cement. I. Influence of the Gentamicin Concentration on the Release Process Mechanism.

Effect of staining solutions on color of pre-reacted glass-ionomer containing composites

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