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RISS 인기검색어
- 검색키워드
- 저자 : Sara Kaveh (검색결과 3 건)
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Yalda Chehrehsaz,Kaveh Hajizadeh,Afra Hadjizadeh,Lida Moradi,Sara Mahshid 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.6
Despite many advantages of titanium, such as proper mechanical properties, biocompatibility and corrosion resistance, ithas two main weaknesses; low tensile strength compared to other metallic biomaterials, and inadequate osseointegrationowing to its bioinert spontaneous surface oxide layer. Grain refinement using Equal Channel Angular Pressing (ECAP) hasbeen preferred as a desirable method to enhance low tensile strength. In addition, osseointegration could be improved byelectrochemical oxidation (anodization), resulting in titania nanotubes formation on titanium surface. The latter has beenextensively studied on commercially pure titanium (CP-Ti), and the formed nanotubes have been well characterized. However,a thorough observation on anodic nanotubes of ECAP-processed coarse-grained pure titanium (CG-Ti) is missing. In thisresearch, we aimed to investigate the surface characteristics and cytotoxicity of anodic TiO2nanotubes on ECAP-processedCP-Ti substrate compared to that of CG-Ti. The results generally showed superior use of nanotubes anodized on ECAP-edCP-Ti substrates over that of coarse-grained ones. We acquired ultrafine-grained titanium (UFG-Ti) by ECAP, and synthesizedanodic nanotube arrays on both UFG-Ti and CG-Ti at different times and voltages. We compared the resulted nanotubes’morphologies, physicochemical and biological properties, in which cell culture on anodic TiO2nanotubes of ECAP-edCP-Ti has been performed for the first time by this research. FESEM results showed relatively lower diameter and longernanotubes for UFG-Ti samples rather than CG-Ti ones. Nanotubes of both substrates were amorphous, and CG-Ti nanotubeswere more hydrophilic than UFG-Ti nanotubes. Enhanced cell viability and proliferation were achieved on ECAP-ed CP-Tianodic TiO2nanotubes.
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Effect of three nanobiomaterials on microhardness of bleached enamel
Maryam Khoroushi,Farinaz Shirban,Sara Kaveh,Samaneh Doustfateme, 대한치과보존학회 2016 Restorative Dentistry & Endodontics Vol.41 No.3
Objectives: The aim of this in vitro study was to evaluate the effect of incorporating three different nanobiomaterials into bleaching material on microhardness of bleached enamel. Materials and Methods: The crowns of 24 extracted sound human molars were sectioned. Sixty enamel specimens (2 × 3 × 4 mm) were selected and divided into five groups (n = 12): Group 1 received no bleaching procedure (control); Group 2 underwent bleaching with a 40% hydrogen peroxide (HP) gel; Groups 3, 4, and 5 were bleached with a 40% HP gel modified by incorporation of bioactive glass (BAG), amorphous calcium phosphate (ACP) and hydroxyapatite (HA), respectively. The enamel microhardness was evaluated. The differences in Knoop microhardness data of each group were analyzed by one-way ANOVA, followed by post hoc Tukey tests. Results: Significant differences were observed between the study groups. The enamel microhardness changes in Groups 1, 3, 4, and 5 were significantly lower than that of Group 2 (p < 0.001). Conclusions: Within the limitations of this study, it can be concluded that incorporation of each one of the three tested biomaterials as remineralizing agents might be effective in decreasing enamel microhardness changes subsequent to in-office bleaching.
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Effect of three nanobiomaterials on microhardness of bleached enamel
Khoroushi, Maryam,Shirban, Farinaz,Kaveh, Sara,Doustfateme, Samaneh The Korean Academy of Conservative Dentistry 2016 Restorative Dentistry & Endodontics Vol.41 No.3
Objectives: The aim of this in vitro study was to evaluate the effect of incorporating three different nanobiomaterials into bleaching material on microhardness of bleached enamel. Materials and Methods: The crowns of 24 extracted sound human molars were sectioned. Sixty enamel specimens ($2{\times}3{\times}4 mm$) were selected and divided into five groups (n = 12): Group 1 received no bleaching procedure (control); Group 2 underwent bleaching with a 40% hydrogen peroxide (HP) gel; Groups 3, 4, and 5 were bleached with a 40% HP gel modified by incorporation of bioactive glass (BAG), amorphous calcium phosphate (ACP) and hydroxyapatite (HA), respectively. The enamel microhardness was evaluated. The differences in Knoop microhardness data of each group were analyzed by one-way ANOVA, followed by post hoc Tukey tests. Results: Significant differences were observed between the study groups. The enamel microhardness changes in Groups 1, 3, 4, and 5 were significantly lower than that of Group 2 (p < 0.001). Conclusions: Within the limitations of this study, it can be concluded that incorporation of each one of the three tested biomaterials as remineralizing agents might be effective in decreasing enamel microhardness changes subsequent to in-office bleaching.
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