Micro-CT evaluation of internal adaptation in resin fillings with different dentin adhesives
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Objectives: The purpose of present study was to evaluate the internal adaptation ofcomposite restorations using different adhesive systems. Materials and Methods:Typical class I cavities were prepared in 32 human third molars. The teeth were dividedinto the following four groups: 3-step etch-and-rinse, 2-step etch-and-rinse, 2-stepself-etch and 1-step self-etch system were used. After the dentin adhesives wereapplied, composite resins were filled and light-cured in two layers. Then, silver nitratesolution was infiltrated, and all of the samples were scanned by micro-CT before andafter thermo-mechanical load cycling. For each image, the length to which silvernitrate infiltrated, as a percentage of the whole pulpal floor length, was calculated(%SP). To evaluate the internal adaptation using conventional method, the sampleswere cut into 3 pieces by two sectioning at an interval of 1 mm in the middle of thecavity and they were dyed with Rhodamine-B. The cross sections of the specimenswere examined by stereomicroscope. The lengths of the parts where actual leakagewas shown were measured and calculated as a percentage of real leakage (%RP). Thevalues for %SP and %RP were compared. Results: After thermo-mechanical loading, allspecimens showed significantly increased %SP compared to before thermo-mechanicalloading and 1-step self-etch system had the highest %SP (p < 0.05). There was atendency for %SP and %RP to show similar microleakage percentage depending on itssectioning. Conclusions: After thermo-mechanical load cycling, there were differencesin internal adaptation among the groups using different adhesive systems.
Abstract
Objectives: The purpose of present study was to evaluate the internal adaptation ofcomposite restorations using different adhesive systems. Materials and Methods:Typical class I cavities were prepared in 32 human third molars. The teeth were dividedinto the following four groups: 3-step etch-and-rinse, 2-step etch-and-rinse, 2-stepself-etch and 1-step self-etch system were used. After the dentin adhesives wereapplied, composite resins were filled and light-cured in two layers. Then, silver nitratesolution was infiltrated, and all of the samples were scanned by micro-CT before andafter thermo-mechanical load cycling. For each image, the length to which silvernitrate infiltrated, as a percentage of the whole pulpal floor length, was calculated(%SP). To evaluate the internal adaptation using conventional method, the sampleswere cut into 3 pieces by two sectioning at an interval of 1 mm in the middle of thecavity and they were dyed with Rhodamine-B. The cross sections of the specimenswere examined by stereomicroscope. The lengths of the parts where actual leakagewas shown were measured and calculated as a percentage of real leakage (%RP). Thevalues for %SP and %RP were compared. Results: After thermo-mechanical loading, allspecimens showed significantly increased %SP compared to before thermo-mechanicalloading and 1-step self-etch system had the highest %SP (p < 0.05). There was atendency for %SP and %RP to show similar microleakage percentage depending on itssectioning. Conclusions: After thermo-mechanical load cycling, there were differencesin internal adaptation among the groups using different adhesive systems.
참고문헌 (40)
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