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KMID : 1034420140390010024
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Restorative Dentistry & Endodontics
2014 Volume.39 No. 1 p.24 ~ p.31
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Micro-CT evaluation of internal adaptation in resin fillings with different dentin adhesives
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Han Seung-Hoon
Park Sung-Ho
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Abstract
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Objectives: The purpose of present study was to evaluate the internal adaptation of composite restorations using different adhesive systems.
Materials and Methods: Typical class I cavities were prepared in 32 human third molars. The teeth were divided into the following four groups: 3-step etch-and-rinse, 2-step etch-and-rinse, 2-step self-etch and 1-step self-etch system were used. After the dentin adhesives were applied, composite resins were filled and light-cured in two layers. Then, silver nitrate solution was infiltrated, and all of the samples were scanned by micro-CT before and after thermo-mechanical load cycling. For each image, the length to which silver nitrate infiltrated, as a percentage of the whole pulpal floor length, was calculated (%SP). To evaluate the internal adaptation using conventional method, the samples were cut into 3 pieces by two sectioning at an interval of 1 mm in the middle of the cavity and they were dyed with Rhodamine-B. The cross sections of the specimens were examined by stereomicroscope. The lengths of the parts where actual leakage was shown were measured and calculated as a percentage of real leakage (%RP). The values for %SP and %RP were compared.
Results: After thermo-mechanical loading, all specimens showed significantly increased %SP compared to before thermo-mechanical loading and 1-step self-etch system had the highest %SP (p < 0.05). There was a tendency for %SP and %RP to show similar microleakage percentage depending on its sectioning.
Conclusions: After thermo-mechanical load cycling, there were differences in internal adaptation among the groups using different adhesive systems.
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KEYWORD
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Dentin adhesive, Internal adaptation, Micro-CT, Microleakage
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