Effects of acid-etching on the tensile properties of demineralized dentin matrix

Yi Zhang, Kelli Agee, Jacques Nör, Ricardo Carvalho, Bhupinder Sachar, Carl Russell, David Henry Pashley

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Objectives. Little research has been done to evaluate the effects of acids commonly used in adhesive dentistry, on the tensile properties of the demineralized dentin matrix. The purpose of this study was to evaluate the effects of a number of acidic conditioners on the ultimate tensile strength (UTS) and modulus of elasticity (E) of human coronal dentin matrix. Methods. Small hour-glass shaped (for UTS) or I-beam shaped (for determination of E) were prepared from mid-coronal dentin of extracted human third molars. After protecting the ends with varnish, the middle of the specimens was completely demineralized in 0.5 M EDTA (pH 7). UTS was determined by tensile stressing to failure. Modulus of elasticity was calculated from stress strain curves. The results were analyzed by ANOVA and Student-Neuman-Keuls test at the 95% confidence level. Results. Brief (ca. 1-2 min) exposure of demineralized dentin matrix to acids had no measurable effects on its tensile properties. Tenminute exposures to 2.5% and 17.5% nitric acid lowered (p < 0.05) the UTS compared to phosphate buffered saline (PBS)-exposed controls. Exposure of the decalcified dentin to 10% citric acid containing 3% ferric chloride, 10% citric acid, 37% phosphoric acid or 17.5% nitric acid containing 3% ferric chloride for 10 min had no effect on UTS. None of these acids consistently lowered stiffness. Significance. The results indicate that relatively long exposures to acids are required to alter the tensile properties of demineralized dentin. It is unlikely that the brief exposures to acids that are used in adhesive dentistry would acutely weaken the physical properties of demineralized dentin. However, long-term studies should be done to determine if such treatment increases the susceptibility of the matrix to hydrolysis.

Original languageEnglish (US)
Pages (from-to)222-228
Number of pages7
JournalDental Materials
Volume14
Issue number3
DOIs
StatePublished - Jan 1 1998

Fingerprint

Tensile Strength
Dentin
Tensile properties
Etching
Tensile strength
Acids
Dentistry
Nitric Acid
Elastic Modulus
Elastic moduli
Citric acid
Nitric acid
Citric Acid
Adhesives
Varnish
Third Molar
Paint
Ethylenediaminetetraacetic acid
Phosphoric acid
Stress-strain curves

ASJC Scopus subject areas

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

Cite this

Zhang, Y., Agee, K., Nör, J., Carvalho, R., Sachar, B., Russell, C., & Pashley, D. H. (1998). Effects of acid-etching on the tensile properties of demineralized dentin matrix. Dental Materials, 14(3), 222-228. https://doi.org/10.1016/S0109-5641(98)00035-9

Effects of acid-etching on the tensile properties of demineralized dentin matrix. / Zhang, Yi; Agee, Kelli; Nör, Jacques; Carvalho, Ricardo; Sachar, Bhupinder; Russell, Carl; Pashley, David Henry.

In: Dental Materials, Vol. 14, No. 3, 01.01.1998, p. 222-228.

Research output: Contribution to journalArticle

Zhang, Y, Agee, K, Nör, J, Carvalho, R, Sachar, B, Russell, C & Pashley, DH 1998, 'Effects of acid-etching on the tensile properties of demineralized dentin matrix', Dental Materials, vol. 14, no. 3, pp. 222-228. https://doi.org/10.1016/S0109-5641(98)00035-9
Zhang Y, Agee K, Nör J, Carvalho R, Sachar B, Russell C et al. Effects of acid-etching on the tensile properties of demineralized dentin matrix. Dental Materials. 1998 Jan 1;14(3):222-228. https://doi.org/10.1016/S0109-5641(98)00035-9
Zhang, Yi ; Agee, Kelli ; Nör, Jacques ; Carvalho, Ricardo ; Sachar, Bhupinder ; Russell, Carl ; Pashley, David Henry. / Effects of acid-etching on the tensile properties of demineralized dentin matrix. In: Dental Materials. 1998 ; Vol. 14, No. 3. pp. 222-228.
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abstract = "Objectives. Little research has been done to evaluate the effects of acids commonly used in adhesive dentistry, on the tensile properties of the demineralized dentin matrix. The purpose of this study was to evaluate the effects of a number of acidic conditioners on the ultimate tensile strength (UTS) and modulus of elasticity (E) of human coronal dentin matrix. Methods. Small hour-glass shaped (for UTS) or I-beam shaped (for determination of E) were prepared from mid-coronal dentin of extracted human third molars. After protecting the ends with varnish, the middle of the specimens was completely demineralized in 0.5 M EDTA (pH 7). UTS was determined by tensile stressing to failure. Modulus of elasticity was calculated from stress strain curves. The results were analyzed by ANOVA and Student-Neuman-Keuls test at the 95{\%} confidence level. Results. Brief (ca. 1-2 min) exposure of demineralized dentin matrix to acids had no measurable effects on its tensile properties. Tenminute exposures to 2.5{\%} and 17.5{\%} nitric acid lowered (p < 0.05) the UTS compared to phosphate buffered saline (PBS)-exposed controls. Exposure of the decalcified dentin to 10{\%} citric acid containing 3{\%} ferric chloride, 10{\%} citric acid, 37{\%} phosphoric acid or 17.5{\%} nitric acid containing 3{\%} ferric chloride for 10 min had no effect on UTS. None of these acids consistently lowered stiffness. Significance. The results indicate that relatively long exposures to acids are required to alter the tensile properties of demineralized dentin. It is unlikely that the brief exposures to acids that are used in adhesive dentistry would acutely weaken the physical properties of demineralized dentin. However, long-term studies should be done to determine if such treatment increases the susceptibility of the matrix to hydrolysis.",
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