試作ファイバーポストを用いた支台築造システムの封鎖性に関する評価

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The purpose of this study was to evaluate the coronal leakage of cemented prototype fiber post using a new dye penetration method. Thirty-nine extracted single-rooted lower premolars were used. Their crowns were removed, and the root lengths were standardized at 12 mm. Two roots without root canal preparation were used as negative controls. In the remaining 37 roots, canals were instrumented using ISO size #15-#40 K-files with the standardized method, and a 6 mm-long post space was prepared for each root at the coronal portion. Then, an apical 6 mm of all the roots was resected. Two of the prepared roots were used as positive controls. The remaining 35 roots were randomly divided into 5 groups of 7 roots each, and the post space was filled with one of the following methods: Group A: AD post (Kuraray)+DC core (Kuraray) Group B: DC core Group C: Fibrekor Post (Pentron)+BUILD-IT FR (Pentron) Group D: AD post+Ketac-Cem (3M Espe) Group E: prototype fiber post+DC core A polypropylene tube that contained 0.06 % methylene blue dye solution was attached to the coronal portion of the root. Two millimeters of the apical portion was immersed into distilled water in a glass bottle. The amount of dye emerging through the root into the water was measured with a spectrophotometer at 1, 4, 8, 15, and 30 days after the immersion. Data obtained were statistically analyzed using ANOVA and the Tuke-Kramer test at the 5 % significance level. The amount of dye leakage in all experimental groups increased with the immersion period. There was a significant difference between the groups for experimental groups increased with the immersion period. There was a significant difference between the groups for experimental time intervals (p<0.05, 2-way ANO-VA). There was no significant interaction between groups. Statistical analysis revealed that the amount of dye leakage in Group D on the 30th day was significantly larger than that in the other groups (p<0.05, Tukey-Kramer). The results showed that a good sealing was obtained in all post groups when dentin adhesive cements were used. Group E was comparable with currently available fiber post and composite resin systems.
特定非営利活動法人日本歯科保存学会の論文
2006-08-31

試作ファイバーポストを用いた支台築造システムの封鎖性に関する評価

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