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. 2005 Nov;84(11):1075-8.
doi: 10.1177/154405910508401121.

Tensile strength of mineralized/demineralized human normal and carious dentin

Y Nishitani  1 , M Yoshiyama, F R Tay, B Wadgaonkar, J Waller, K Agee, D H Pashley
Affiliations

Tensile strength of mineralized/demineralized human normal and carious dentin

Y Nishitani et al. J Dent Res. 2005 Nov.

Abstract

The bond strengths of resins to caries-affected dentin are low. This could be due to weakened organic matrix. The purpose of this work was to determine if the ultimate tensile strength (UTS) of excavated carious dentin is weaker than that of normal dentin. Soft caries was excavated from extracted human molars, and the tooth was vertically sectioned into slabs. Each slab was trimmed to an hourglass shape, parallel or perpendicular to the tubule direction. Half of the specimens were mineralized, while the other half were completely demineralized in EDTA. ANOVA on ranks showed that the three-factor interactions (mineralization, caries, tubule direction) were all significant (p < 0.0001), indicating that mineralization and tubule direction gave different UTS results in normal and caries-affected dentin. No significant differences were seen between the UTS of normal and and that of caries-affected demineralized dentin in the parallel or perpendicular group. The matrix of demineralized caries-affected dentin was as strong as that of normal demineralized dentin when tested in the same direction.

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Figures

Figure
Figure
Schematic illustrating how caries lesions were excavated to the level of caries-affected dentin, how vertical serial sections were made, how all but the test dentin was ground away in two different directions on adjacent slabs to permit tensile testing parallel (↕) or (↔) perpendicular to tubule long axis.
See this image and copyright information in PMC

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