Optimizing filler content in an adhesive system containing pre-reacted glass-ionomer fillers

K. Ikemura, F. R. Tay, Y. Kouro, T. Endo, M. Yoshiyama, K. Miyai, D. H. Pashley

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

Objectives. (1) To evaluate the optimal concentration of the calcium type pre-reacted glass-ionomer (PRG-Ca) fillers in experimental light-activated adhesives for bonding to tooth substrates and fluoride release; (2) to evaluate the polymerization reactivity of these experimental filled adhesives; and (3) to examine the ultrastructure of the resin-dentin interface bonded with the commercial version of this self-etching adhesive (Imperva Fluoro Bond, Shofu Inc., Kyoto, Japan). Materials and methods. PRG-Ca fillers were prepared from the acid-base reaction of calcium type fluoroaluminosilicate glass with poly(acrylic acid) in water. Different experimental light-cured adhesives were prepared, with 0-57 wt% PRG-Ca fillers and 3 wt% aerosil silica incorporated in a resin matrix. Twenty-four hours shear bond strengths to bovine enamel and dentin were assessed using the adhesive with/or without accelerated aging. The cumulative amount of fluoride released from the cured adhesives and differential scanning calorimetry (DSC) measurements were also conducted. 180-grit SiC paper polished human dentin disks were treated with Imperva Fluoro Bond that contains 17 wt% PRG-Ca fillers and prepared for TEM examination. Results. Increase in PRG-Ca filler content of experimental adhesives was highly correlated with the decrease in bond strengths to dentin (r = -0.96 to -0.99), the increase in cumulative fluoride release, (r = 0.97) and the decrease in polymerization energy (cal/g) of the adhesives (r = -0.99) (p < 0.001). A PRG-Ca content of 17wt% provided optimal bond strength to enamel and dentin after accelerated aging and fluoride release. TEM showed that salt-like matrices were present around the hydrogels and remnant glass cores of the PRG-Ca fillers. The commercial self-etching primer completely dissolved the smear layer and formed 2 μm thick hybrid layers in intact dentin. Significance. The use of silanized PRG-Ca fillers provides good adhesion and a source of fluoride release in a commercially available self-etching adhesive system.

Original languageEnglish (US)
Pages (from-to)137-146
Number of pages10
JournalDental Materials
Volume19
Issue number2
DOIs
StatePublished - Mar 1 2003

Fingerprint

Ionomers
Adhesives
Fillers
Dentin
Glass
Fluorides
Etching
Enamels
carbopol 940
Dental Enamel
Polymerization
Silicon Dioxide
Calcium
Resins
Aging of materials
Smear Layer
Transmission electron microscopy
glass ionomer
Light
Shear Strength

Keywords

  • Fluoride release
  • Light-cured adhesive
  • Pre-reacted glass-ionomer filler
  • Shear bond strength
  • TEM

ASJC Scopus subject areas

  • Materials Science(all)
  • Dentistry(all)
  • Mechanics of Materials

Cite this

Optimizing filler content in an adhesive system containing pre-reacted glass-ionomer fillers. / Ikemura, K.; Tay, F. R.; Kouro, Y.; Endo, T.; Yoshiyama, M.; Miyai, K.; Pashley, D. H.

In: Dental Materials, Vol. 19, No. 2, 01.03.2003, p. 137-146.

Research output: Contribution to journalArticle

Ikemura, K, Tay, FR, Kouro, Y, Endo, T, Yoshiyama, M, Miyai, K & Pashley, DH 2003, 'Optimizing filler content in an adhesive system containing pre-reacted glass-ionomer fillers', Dental Materials, vol. 19, no. 2, pp. 137-146. https://doi.org/10.1016/S0109-5641(02)00022-2
Ikemura, K. ; Tay, F. R. ; Kouro, Y. ; Endo, T. ; Yoshiyama, M. ; Miyai, K. ; Pashley, D. H. / Optimizing filler content in an adhesive system containing pre-reacted glass-ionomer fillers. In: Dental Materials. 2003 ; Vol. 19, No. 2. pp. 137-146.
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abstract = "Objectives. (1) To evaluate the optimal concentration of the calcium type pre-reacted glass-ionomer (PRG-Ca) fillers in experimental light-activated adhesives for bonding to tooth substrates and fluoride release; (2) to evaluate the polymerization reactivity of these experimental filled adhesives; and (3) to examine the ultrastructure of the resin-dentin interface bonded with the commercial version of this self-etching adhesive (Imperva Fluoro Bond, Shofu Inc., Kyoto, Japan). Materials and methods. PRG-Ca fillers were prepared from the acid-base reaction of calcium type fluoroaluminosilicate glass with poly(acrylic acid) in water. Different experimental light-cured adhesives were prepared, with 0-57 wt{\%} PRG-Ca fillers and 3 wt{\%} aerosil silica incorporated in a resin matrix. Twenty-four hours shear bond strengths to bovine enamel and dentin were assessed using the adhesive with/or without accelerated aging. The cumulative amount of fluoride released from the cured adhesives and differential scanning calorimetry (DSC) measurements were also conducted. 180-grit SiC paper polished human dentin disks were treated with Imperva Fluoro Bond that contains 17 wt{\%} PRG-Ca fillers and prepared for TEM examination. Results. Increase in PRG-Ca filler content of experimental adhesives was highly correlated with the decrease in bond strengths to dentin (r = -0.96 to -0.99), the increase in cumulative fluoride release, (r = 0.97) and the decrease in polymerization energy (cal/g) of the adhesives (r = -0.99) (p < 0.001). A PRG-Ca content of 17wt{\%} provided optimal bond strength to enamel and dentin after accelerated aging and fluoride release. TEM showed that salt-like matrices were present around the hydrogels and remnant glass cores of the PRG-Ca fillers. The commercial self-etching primer completely dissolved the smear layer and formed 2 μm thick hybrid layers in intact dentin. Significance. The use of silanized PRG-Ca fillers provides good adhesion and a source of fluoride release in a commercially available self-etching adhesive system.",
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AU - Yoshiyama, M.

AU - Miyai, K.

AU - Pashley, D. H.

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N2 - Objectives. (1) To evaluate the optimal concentration of the calcium type pre-reacted glass-ionomer (PRG-Ca) fillers in experimental light-activated adhesives for bonding to tooth substrates and fluoride release; (2) to evaluate the polymerization reactivity of these experimental filled adhesives; and (3) to examine the ultrastructure of the resin-dentin interface bonded with the commercial version of this self-etching adhesive (Imperva Fluoro Bond, Shofu Inc., Kyoto, Japan). Materials and methods. PRG-Ca fillers were prepared from the acid-base reaction of calcium type fluoroaluminosilicate glass with poly(acrylic acid) in water. Different experimental light-cured adhesives were prepared, with 0-57 wt% PRG-Ca fillers and 3 wt% aerosil silica incorporated in a resin matrix. Twenty-four hours shear bond strengths to bovine enamel and dentin were assessed using the adhesive with/or without accelerated aging. The cumulative amount of fluoride released from the cured adhesives and differential scanning calorimetry (DSC) measurements were also conducted. 180-grit SiC paper polished human dentin disks were treated with Imperva Fluoro Bond that contains 17 wt% PRG-Ca fillers and prepared for TEM examination. Results. Increase in PRG-Ca filler content of experimental adhesives was highly correlated with the decrease in bond strengths to dentin (r = -0.96 to -0.99), the increase in cumulative fluoride release, (r = 0.97) and the decrease in polymerization energy (cal/g) of the adhesives (r = -0.99) (p < 0.001). A PRG-Ca content of 17wt% provided optimal bond strength to enamel and dentin after accelerated aging and fluoride release. TEM showed that salt-like matrices were present around the hydrogels and remnant glass cores of the PRG-Ca fillers. The commercial self-etching primer completely dissolved the smear layer and formed 2 μm thick hybrid layers in intact dentin. Significance. The use of silanized PRG-Ca fillers provides good adhesion and a source of fluoride release in a commercially available self-etching adhesive system.

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KW - Light-cured adhesive

KW - Pre-reacted glass-ionomer filler

KW - Shear bond strength

KW - TEM

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