ABSTRACT
This study compared the microtensile bond strength (μTBS) and microscopic change of two 2-step and two 1-step self-etching adhesives to dentin according to storage times in distilled water.
Occlusal dentin was exposed in 48 human molars. They were divided to four groups by different adhesives: SE Bond group (Clearfil SE Bond), AdheSE group (AdheSE), Adper group (Adper Prompt L-Pop), and Xeno group (Xeno III). Each group was stored in 37℃ distilled water for 1, 15, and 30 days.
Resin-bonded specimens were sectioned into beams and subjected to μTBS testing with a crosshead speed of 1 mm/minute. For SEM observation, one specimen was selected and sectioned in each group after each stroage time. Resin-dentin interface was observed under FE-SEM.
In all storage times, mean μTBS of SE group was significantly higher than those of other groups (p < 0.05). There was no significant difference between mean μTBS of SE group and AdheSE group among all storage times, but significant difference between 1- and 30-day storage in mean μTBS of Adper group and Xeno group (p < 0.05). For 1-and 15-day storage, all groups showed the close adaptation between resin-dentin interfaces. For 30-day storage, resin-dentin interfaces showed wide gap in Adper group and separate pattern in Xeno III group.
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Figure 1.
Histogram showing microtensile bond strengths for each group to dentin according to storage times in distilled water.
![jkacd-30-204f1.tif](/upload/SynapseXML/0185jkacd/thumb/jkacd-30-204f1.gif)
Figure 2.
SEM photographs showing the close adaptation of dentin-resin interface produced by Clearfil SE Bond (SE), AdheSE (AD), Adper Prompt L-Pop (LP), and Xeno III (XE) after 1-day distilled water storage (× 1000).
![jkacd-30-204f2.tif](/upload/SynapseXML/0185jkacd/thumb/jkacd-30-204f2.gif)
Figure 3.
SEM photographs showing the close adaptation of dentin-resin interface produced by Clearfil SE Bond (SE), AdheSE (AD), Adper Prompt L-Pop (LP), and Xeno III (XE) after 15-day distilled water storage (× 1000).
![jkacd-30-204f3.tif](/upload/SynapseXML/0185jkacd/thumb/jkacd-30-204f3.gif)
Figure 4.
SEM photographs showing the close adaptation of dentin-resin interface produced by Clearfil SE Bond (SE) and tiny gap between dentin and resin interface produced by AdheSE (AD) after 30-day distilled water storage (× 1000).
![jkacd-30-204f4.tif](/upload/SynapseXML/0185jkacd/thumb/jkacd-30-204f4.gif)
Figure 5.
SEM photographs showing wide gap between the dentin-resin interface produced by Adper Prompt L-Pop (LP), and separate pattern between the interface of resin and adhesive layer produced by Xeno III (XE) after 30-day distilled water storage (× 1000).
![jkacd-30-204f5.tif](/upload/SynapseXML/0185jkacd/thumb/jkacd-30-204f5.gif)
Table 1.
The components and pH of two- and one-step self-etching adhesives and composites used
MDP = 10-methacryloyloxydecyl dihydrogen phosphate, HEMA = 2 hydroxyethyl methacrylate, DMA = dimethacryl-ate, Bis-GMA = Bisphenol glycidyl methacrylate, CQ = camphoroquinone, Pyro-EMA = tetramethacryloxyethyl pyrophosphate, PEM-F = pentamethacry loxyethyl cyclophophazen mono fluoride, UDMA = urethane dimethacrylate, BHT = 2,6-Di-tert-butyl-p hydroxyl toluene, EPD = p-dimethylamino ethyl benzoate.
Table 2.
Mean microtensile bond strengths (MPa) of each group to dentin according to storage times in distilled water