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RISS 인기검색어
- 검색키워드
- 저자 : Narendra U Manwar (검색결과 2 건)
- 무료
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Keyur Pankaj. Chande,Narendra U. Manwar,Manoj G. Chandak 대한예방치과학회 2013 International Journal of Clinical Preventive Denti Vol.9 No.4
Objective: The aim of this study is to compare the effect of surface moisture on dentinal tensile bond strength. Methods: Eighty freshly extracted caries free Mandibular first molars were selected. The specimens were randomly divided into four groups of 20 teeth each. Occlusal surface were ground by diamond disc till all occlusal enamel is removed. After treating the occlusal surface of specimens with 37% orthophosphoric acid for 15 sec, specimens were divided into 4 groups namely. Group I (Over wet), Group II (Blot Dry), Group III (One Second Dry) and Group IV (Over Dry). Each group was treated with single bond adhesive (3M ESPE). Composite cylinders were build up using Teflon moulds and cured. Tensile bond strength was tested using INSTRON universal testing machine. The results were analysed statistically. Results: The tensile bond strength values were highest in Group II (Blot dry) and statistically significant. Conclusion: Blot drying after etching provided better bond strength.
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Effect of Chelating Agents and Irrigants on Mineral Content of Root Canal Dentin: An In Vitro Study
Keyur Pankaj Chande,Narendra U Manwar,Manoj G Chandak,Jyoti Lokade,Sneha R Chandak 대한예방치과학회 2014 International Journal of Clinical Preventive Denti Vol.10 No.3
Objective: To evaluate and compare ex vivo the decalcifying effect of 17% ethylenediaminetetraacetic acid (EDTA), 15% citric acid, 37% phosphoric acid and 5.25% sodium hypochlorite on root canal dentin. Methods: Two 2-mm-thick slices were cut from the coronal third of the root of 24 human incisors. Each slice was sectioned into two equal parts. Specimens were assigned to one of four groups (n=24) for immersion in 20 ml of either 17% EDTA, or 15% citric acid, 37% phosphoric acid or 5.25% NaOCl, for three time periods (5, 10, and 15 minutes). The concentration of Ca2+ extracted from the dentine was measured by mass spectrophometry.The amount of calcium extracted was analysed using the Kruskal-Wallis test for global comparisons and the Mann-Whitney U-test for pairwise comparisons. Results: In the three time periods, 17% EDTA and 15% citric acid extracted the largest amount of calcium, with no significant differences between them. The 5.25% NaOCl solution extracted significant amounts of calcium, whereas 17% EDTA extracted 9.3 mg of the calcium in the first 5 min, and 15% citric acid and 37% phosphoric acid had a similar pattern of calcium removal (2.06 mg and 1.82 mg in first 5 minutes, respectively). Conclusion: Solutions of 15% EDTA, 15% citric acid and 5% phosphoric acid decalcify root dentine, with most calcium extracted during the first 5 minutes of action. The efficacy of 15% citric acid and 17% EDTA solutions was significantly greater than that of 37% phosphoric acid solution at each time period (5, 10 and 15 minutes).
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