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. 2009 Feb;88(2):146-51.
doi: 10.1177/0022034508328910.

Durability of resin-dentin bonds to water- vs. ethanol-saturated dentin

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Durability of resin-dentin bonds to water- vs. ethanol-saturated dentin

K Hosaka et al. J Dent Res. 2009 Feb.

Abstract

Higher 24-hour resin-dentin bond strengths are created when ethanol is used to replace water during wet bonding. This in vitro study examined if ethanol-wet-bonding can increase the durability of resin-dentin bonds over longer times. Five increasingly hydrophilic experimental resin blends were bonded to acid-etched dentin saturated with water or ethanol. Following composite build-ups, the teeth were reduced into beams for 24-hour microtensile bond strength evaluation, and for water-aging at 37 degrees C for 3, 6, or 12 months before additional bond strength measurements. Although most bonds made to water-saturated dentin did not change over time, those made to ethanol-saturated dentin exhibited higher bond strengths, and none of them fell over time. Decreased collagen fibrillar diameter and increased interfibrillar spacing were seen in hybrid layers created with ethanol-wet-bonding. Increases in bond strength and durability in ethanol-wet-bonding may be due to higher resin uptake and better resin sealing of the collagen matrix, thereby minimizing endogenous collagenolytic activities.

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Figures

Figure 1.
Figure 1.
Bond strengths and miscibility of resins to water- vs. ethanol-saturated dentin. (A) Plot of microtensile bond strength (µTBS) vs. incubation time for the 5 experimental resin blends listed in Table 1. The blends were dissolved in 50% ethanol and applied to acid-etched dentin wet with water. Means identified by different lower-case letters are significantly different (p < 0.05). (B) Plot of µTBS vs. storage time. The blends were dissolved in 50% ethanol and applied to acid-etched dentin saturated with 100% ethanol. Means identified by different lower-case letters are significantly different (p < 0.05). (C) Plot of Hoy’s solubility parameters for polar cohesive forces (δp) vs. those for hydrogen bonding cohesive forces (δh) of the 5 solvated resin blends relative to “miscibility circles” created by drawing a circle with a radius of 5 (MPa)1/2 around those same δ values for water- or ethanol-saturated dentin matrix (see Table 1 for specific values). The dotted circle indicates the direction in which the “miscibility circle” for water-saturated dentin would move as ethanol in the solvated resins removes water from the matrix beginning with water-saturated dentin (solid circle, far right) and then becomes half-saturated dentin matrix (dotted middle circle) ending with ethanol-saturated dentin (far left solid circle).
Figure 2.
Figure 2.
Transmission electron microscopy images of acid-etched dentin bonded with (A) solvated resin 2 to water-saturated dentin (top of hybrid layer), (B) solvated resin 2 to ethanol-saturated dentin (top of hybrid layer), (C) solvated resin 3 to water-saturated dentin (middle portion of hybrid layer), and (D) solvated resin 3 to ethanol-saturated dentin (middle portion of hybrid layer).

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