open access

https://hdl.handle.net/2115/56155

クエン酸応用が３種の水酸化カルシウム製剤の除去と歯根象牙質の接着性に及ぼす影響 [全文の要約]

日本語

根尖封鎖

2014-03-25

Hokkaido University

https://www.lib.hokudai.ac.jp/dissertations/copy-guides/

Calcium hydroxide(Ca(OH)2) has been generally used for root canal dressing. However, remnants of calcium hydroxide reduces the sealing ability of resin-based-sealer. The purpose of this study was to investigate the efficacy of 10% citric acid and 3% ferric chlorite(10-3 solution) on removing three types of calcium hydroxide and adhesion to root dentin. For experiment 1, extracted human teeth were split longitudinally(crown-to-root direction) into halves. After 300μm groove were prepared, those were reconstituted and fixed. The reassembled root canal were filled with Vitapex® (Vitapex group), Calcipex plane II® (Calcipex group) or Ca(OH)2 mixed with distilled water(Reagent group), stored for 1 or 4 week at 37°Cin 100% humidity and ultrasonically irrigated with ultrasonic file #50 for 60s and the following irrigants,10-3 solution for 60s and 10% sodium hypochlorite for 30s. The percentage of Ca(OH)2 remnants area was measured microscopically with 40 magnification and was calculated. Dentin surface of the root canal and gap was examined by SEM. For experiment 2, the reassembled root canal were filled with Calcipex plane II® (Calcipex group) or Ca(OH)2 mixed with distilled water (Reagent group), stored for 1 or 4 weeks at 37°Cin 100% humidity and ultrasonically irrigated in the same way. A control group of root canal was not dressed. Micro tensile bond strength(MTBS) test and dyepenetration test were employed to evaluate dentin bond strength and leakage between 4-META/MMA-TBB resin sealer (SBS) and the dentin surface of each groups. As the results, the percentage of Ca(OH)2 remnants area in reagent group was lowest, Vitapex group was highest among all groups at 1 and 4 weeks. The percentage of Ca(OH)2 remnants area in each groups at 4 weeks were a little higher than at 1 week. MTBS of Calcipex group was significantly less than each of Reagent group or Control group. Dye penetration distances of Calcipex group was significantly more than in Reagent group and Control group. No statistically significant difference was found between Reagent group and Control group in MTBS test and dye penetration test. The viscosity of agents in Vitapex® and Calcipex plane II® might be influenced on removing calcium hydroxide and adhesion.Therefore, it is suggested that Ca(OH)2 mixed with distilled water is most effectively removed and adhesiveness to root dentin can be recovered.

甲第11255号

博士(歯学)

(主査) 教授 川浪 雅光, 教授 佐野 英彦, 教授 井上 哲

歯学研究科（口腔医学専攻）

博士論文

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