Effects of Dentin Depth on Adhesive Bond Strength in Primary Incisors in vitro
The objective of this study was to investigate the effects of different dentin depths on the microtensile bond strength of a dentin adhesive in primary incisors under simulated intrapulpal pressure in vitro. Thirty-six mandibular primary incisors were collected immediately after extraction and studied within 24 hours. The samples were randomly divided into three groups. The incisal edges were cut to depths of 1.0, 1.5 and 2.0 mm below the DEJ for Groups 1, 2 and 3, respectively. A composite rod with a 1 mm-diameter flat tip was fixed to the cut surface of the tooth, using flowable composite resin under simulated pulpal pressure of 15 cmH2O. The samples were stored in distilled water at 37°C for 24 hours. The microtensile bond strength was tested in a UTM. The p value less than 0.05 was considered significant. The mean ± SD microtensile bond strength values of the three groups tested at 1.0 mm, 1.5 mm, and 2.0 mm of dentin depth were 10.78±1.20, 6.97±0.78, and 3.57±1.05 MPa, respectively. The data revealed that the microtensile bond strength between dentin and adhesive decreased significantly in deeper dentin (p<0.001). This study found that bonding to superficial dentin obtained higher microtensile bond strength than did bonding to deeper dentin under simulation of intrapulpal pressure.
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