Tensile strength and microhardness of treated human dentin

Victoria Fuentes, Laura Ceballos, Raquel Osorio, Manuel Toledano, Ricardo M. Carvalho, David Henry Pashley

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Objectives. To determine the ultimate tensile strength and Knoop hardness of mineralized, EDTA-treated, sodium hypochlorite (NaOCl)-treated, EDTA-treated resin-infiltrated, and NaOCl-treated resin-infiltrated dentin. Methods. Dumbell-shaped specimens with a cross-sectional area of 0.5 mm2 were prepared from the crowns of extracted human third molars. Specimens were randomly assigned to the following experimental groups: (1) mineralized dentin; (2) 0.5 M EDTA-demineralized dentin, pH 7/5 days; (3) 5% NaOCl-deproteinized dentin/2 days; (4) EDTA-treated, Single Bond resin-infiltrated dentin; (5) NaOCl-treated, Single Bond resin-infiltrated dentin. All specimens were tested in tension in a Vitrodyne testing machine at 0.6 mm/min. Knoop microhardness was measured on the fractured edges of specimens in groups 1, 3, 4, and 5. Results were analyzed by ANOVA and SNK tests (p<0.05). Results. Both EDTA and NaOCl treatments caused significant reductions in the tensile strength and microhardness of mineralized dentin (p<0.05), with the largest reductions observed after NaOCl treatment (p<0.05). Resin infiltration of treated dentin resulted in moderate increase of its tensile strength and microhardness, however, the original mineralized values were not recovered (p<0.05). Significance. Whenever dentin surfaces are treated with EDTA or NaOCl prior to a clinical bonding procedure, clinicians must be aware that a weak layer may be present at the interface, which may lead to premature failures of resin/dentin bonds.

Original languageEnglish (US)
Pages (from-to)522-529
Number of pages8
JournalDental Materials
Volume20
Issue number6
DOIs
StatePublished - Jul 1 2004

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Tensile Strength
Ethylenediaminetetraacetic acid
Dentin
Edetic Acid
Microhardness
Tensile strength
Resins
Sodium Hypochlorite
Analysis of variance (ANOVA)
Infiltration
Hardness
Sodium
Third Molar
Crowns
Testing
Analysis of Variance

Keywords

  • Dentin
  • Microhardness
  • Microtensile
  • Tensile strength

ASJC Scopus subject areas

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

Cite this

Fuentes, V., Ceballos, L., Osorio, R., Toledano, M., Carvalho, R. M., & Pashley, D. H. (2004). Tensile strength and microhardness of treated human dentin. Dental Materials, 20(6), 522-529. https://doi.org/10.1016/j.dental.2003.05.005

Tensile strength and microhardness of treated human dentin. / Fuentes, Victoria; Ceballos, Laura; Osorio, Raquel; Toledano, Manuel; Carvalho, Ricardo M.; Pashley, David Henry.

In: Dental Materials, Vol. 20, No. 6, 01.07.2004, p. 522-529.

Research output: Contribution to journalArticle

Fuentes, V, Ceballos, L, Osorio, R, Toledano, M, Carvalho, RM & Pashley, DH 2004, 'Tensile strength and microhardness of treated human dentin', Dental Materials, vol. 20, no. 6, pp. 522-529. https://doi.org/10.1016/j.dental.2003.05.005
Fuentes V, Ceballos L, Osorio R, Toledano M, Carvalho RM, Pashley DH. Tensile strength and microhardness of treated human dentin. Dental Materials. 2004 Jul 1;20(6):522-529. https://doi.org/10.1016/j.dental.2003.05.005
Fuentes, Victoria ; Ceballos, Laura ; Osorio, Raquel ; Toledano, Manuel ; Carvalho, Ricardo M. ; Pashley, David Henry. / Tensile strength and microhardness of treated human dentin. In: Dental Materials. 2004 ; Vol. 20, No. 6. pp. 522-529.
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abstract = "Objectives. To determine the ultimate tensile strength and Knoop hardness of mineralized, EDTA-treated, sodium hypochlorite (NaOCl)-treated, EDTA-treated resin-infiltrated, and NaOCl-treated resin-infiltrated dentin. Methods. Dumbell-shaped specimens with a cross-sectional area of 0.5 mm2 were prepared from the crowns of extracted human third molars. Specimens were randomly assigned to the following experimental groups: (1) mineralized dentin; (2) 0.5 M EDTA-demineralized dentin, pH 7/5 days; (3) 5{\%} NaOCl-deproteinized dentin/2 days; (4) EDTA-treated, Single Bond resin-infiltrated dentin; (5) NaOCl-treated, Single Bond resin-infiltrated dentin. All specimens were tested in tension in a Vitrodyne testing machine at 0.6 mm/min. Knoop microhardness was measured on the fractured edges of specimens in groups 1, 3, 4, and 5. Results were analyzed by ANOVA and SNK tests (p<0.05). Results. Both EDTA and NaOCl treatments caused significant reductions in the tensile strength and microhardness of mineralized dentin (p<0.05), with the largest reductions observed after NaOCl treatment (p<0.05). Resin infiltration of treated dentin resulted in moderate increase of its tensile strength and microhardness, however, the original mineralized values were not recovered (p<0.05). Significance. Whenever dentin surfaces are treated with EDTA or NaOCl prior to a clinical bonding procedure, clinicians must be aware that a weak layer may be present at the interface, which may lead to premature failures of resin/dentin bonds.",
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AB - Objectives. To determine the ultimate tensile strength and Knoop hardness of mineralized, EDTA-treated, sodium hypochlorite (NaOCl)-treated, EDTA-treated resin-infiltrated, and NaOCl-treated resin-infiltrated dentin. Methods. Dumbell-shaped specimens with a cross-sectional area of 0.5 mm2 were prepared from the crowns of extracted human third molars. Specimens were randomly assigned to the following experimental groups: (1) mineralized dentin; (2) 0.5 M EDTA-demineralized dentin, pH 7/5 days; (3) 5% NaOCl-deproteinized dentin/2 days; (4) EDTA-treated, Single Bond resin-infiltrated dentin; (5) NaOCl-treated, Single Bond resin-infiltrated dentin. All specimens were tested in tension in a Vitrodyne testing machine at 0.6 mm/min. Knoop microhardness was measured on the fractured edges of specimens in groups 1, 3, 4, and 5. Results were analyzed by ANOVA and SNK tests (p<0.05). Results. Both EDTA and NaOCl treatments caused significant reductions in the tensile strength and microhardness of mineralized dentin (p<0.05), with the largest reductions observed after NaOCl treatment (p<0.05). Resin infiltration of treated dentin resulted in moderate increase of its tensile strength and microhardness, however, the original mineralized values were not recovered (p<0.05). Significance. Whenever dentin surfaces are treated with EDTA or NaOCl prior to a clinical bonding procedure, clinicians must be aware that a weak layer may be present at the interface, which may lead to premature failures of resin/dentin bonds.

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