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The Importance of Intrafibrillar Mineralization of Collagen on the Mechanical Properties of Dentin

Department of Preventive and Restorative Dental Sciences, University of California, San Francisco;

View larger version (25K): [in this window] [in a new window]   Figure 1. A box plot of the magnitudes of the indentation Young’s modulus (pooled from all specimens) in dry and wet normal dentin, the more highly mineralized near-pulp regions of the altered dentin (DI+), and the less-mineralized mid-coronal altered dentin (DI). The box encloses the 50% of the data lying between the upper and lower quartiles, and the solid horizontal bar is the median. All of the data from multiple measurements of the N = 3 teeth are contained within the error bars. The means and standard deviations of the specimen averages in each group are written above the graph (N = 3). The differences between wet and dry were significant (p < 0.001). The difference between the wet DI+ and wet DI was not significant.

View larger version (22K): [in this window] [in a new window]   Figure 2. A box plot of the magnitudes of the hardness of the dry and wet dentins. See caption in Fig. 1 for additional explanation.

View larger version (13K): [in this window] [in a new window]   Figure 3. Dry (solid circles) and wet (solid squares) magnitudes of the indentation Young’s modulus (E) of normal (N), pulpal region of the altered dentin (DI+), and mid-coronal region of the altered (DI) dentin. The error bars represent the standard deviations in the measured magnitudes (N = 3). There was a linear relationship (R2 = 0.99) between the mineral concentration and the Young’s modulus in the dry dentins, in agreement with Eq. 1.2. The correlation with mineral concentration vanished when the dentin was hydrated. Similar behavior was observed for hardness.

Journal of Dental Research, Vol. 82, No. 12, 957-961 (2003)
DOI: 10.1177/154405910308201204


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