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Improved corrosion resistance of dental Ti50Zr alloy with(TiZr)N coating in fluoridated acidic artificial saliva

Rare Metals 2021年第10期40卷 2927-2936页

作者： Wen-Fang Cui Yang-Yang Dong Yong-Cun Bao Gao-Wu Qin Key Laboratory for Anisotropy and Texture of materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China

The electrochemical corrosion behavior of the dental Ti50 Zr alloy with and without nanocrystalline(TiZr)N coating was comparatively investigated in artificial saliva solutions with different pH values and fluoride ion concentrations. The chemical stability of the passive films on the coated and non-coated Ti50 Zr alloy was evaluated by calculating passive film thickness. The chemical compositions and valence structures of the passive films were analyzed by X-ray photoelectron spectroscopy(XPS). The results show that the(TiZr)N-coated alloy displays distinctly decreased corrosion rate and increased impedance compared with Ti50 Zr alloy in nonfluoridated and fluoridated acidic solutions. Particularly, in the solution of pH = 3.9 and 0.15% NaF-containing, the corrosion protection efficiency of(TiZr)N coating reaches90%. The excellent corrosion resistance of the coated alloy is attributed to that the nanocrystallines in(TiZr)N coating decreases micropores and crack defects, which strongly impedes the corrosive ions diffusion and electrode process at Ti substrate/coating interface. Meanwhile,(TiZr)N coating shows good passivation behavior in acidic solution and active–passive transition behavior in fluoridated acidic solution. The coated Ti50 Zr alloy with high chemical stability has potential application prospect for dental implants.

关键词： dental material Titanium alloy Nitride coating Fluoride Corrosion

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Novel Unilateral dental Expander Appliance(UDEX):A Compound Innovative materials

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Computers, materials & Continua 2021年第9期68卷 3499-3511页

作者： Hasan Sabah Hasan Abdallah AAbdallah Imran Khan Hala Sadek Alosman Ayshan Kolemen Bilal Alhayani Department of Orthodontic Khanzad Teaching CenterGeneral Directorate of Hawler-Ministry of HealthErbilIraq Department of Industrial Engineering German Jordanian UniversityAmmanJordan Department of Electrical Engineering University of Engineering and TechnologyPeshawarPakistan Department of Orthodontics Near East UniversityNicosiaNorth CYPRUSTurkey Orthodontic Department Al-Mustaqbal University CollegeBabelIraq Department of Electronics and communication Yildiz Technical UniversityTurkey

True unilateral posterior crossbite in adults is a challenging malocclusion to treat,especially when we need to correct cross-arch segments with unwanted effects on non-cross *** expansion methods are expected to have some shortcomings;the Unilateral dental expander appliance used to restore unilateral cross bite dental arch is an uncommon appliance;for this,a designed new device is *** paper aimed to invite a new unilateral dental expander appliance(UDEX)to treat unilateral dental posterior crossbite in adults using available dental material,easy to use and handle,well tolerated by the patient,and biocompatible with oral *** could find that in all dental markets and dental clinics—an eighteen-year-old female with bilateral crossbite and upper and lower dental arch *** active orthodontic treatment,a quad-helix expander had broken from one side at soldering between band and wire *** patient did not show up to the clinic for a while due to COVID 19 pandemic lockdown,leading to a true unilateral crossbite at the dental arch’s upper left side,especially at the molar premolars *** unilateral cross bite was treated using a new specially designed expanded appliance as a unilateral posterior cross bite dental maxillary *** a result of this study,orthodontic treatment was finished within(15)months,much less than *** obtained Class I molar and canine relationships with uncrossed dental arches in both upper arch sides,proper overbite and overjet with well-leveled and aligned teeth as it confirmed by clinical examination and radiographic images(OPG Orthopantomogram)and cephalometric radiograph(WebCeph analysis digitalized computer program).Conclude from that,the newly designed unilateral dental expander(UDEX)is proven to be useful for treating real unilateral posterior crossbites as single molar or premolar tooth and multiple joint unilateral crossed posterior ***,it could easily modify it fo

关键词： Unilateral crossbite dental material acrylic pads wire bending expander

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SWELLING AND WETTABILITY OF LIGHT-CURED METHACRYLATE-BASED dental RESINS PREPARED FROM CHOLIC ACID

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Chinese Journal of Reactive Polymers 2005年第Z1期 35-43页

作者： HU Xiangzheng1,2 ZHANG Xu1 WANG Zheng1 HE Binglin1 1 The State Key Laboratory of Functional Polymer materials for Adsorption and Separation, Institute of Polymer Chemistry, Nankai University, Tianjin 300071, China 2 College of Science, Tianjin University of Science and Technology, Tianjin 300222, China

2′-methacryloxy-3α, 7α, 12α - trimethacryloyl cholic acid ethyl ester (CAGE4MA) has been prepared from cholic acid. Photo-polymeric resins were prepared from CAGE4MA. 2,2-bis4-(2-hydroxy-3-methacrylyloxypropoxy)phenylpropane (bis-GMA) was used for comparison, triethyleneglycol dimethacrylate (TEGDMA) was used as diluent. The polymerization was initiated by camphoroquinone (CQ)N, N-dimethylaminoethyl methacrylate (DMAEMA) system. The conversion of CAGE4MA was 39% when the reaction time is 60s, which is lower than bis-GMA and TEGDMA. The swelling value of CAGE4MA resin was 0.41% in distilled water, which is much lower than those of bis-GMA resin (2.04%) and TEGDMA resin (4.77%) under the same conditions. Copolymers from CAGE4MA and TEGDMA have been prepared. With the increase of TEGDMA in mixture, the degree of conversion of CAGE4MA and swelling value increased. The swelling values of photocured resins in 0.1molL HCl were also measured.

关键词： Cholic acid Modify dental material Swelling and wettability.

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SWELLING AND WETTABILITY OF LIGHT-CURED METHACRYLATE-BASED dental RESINS PREPARED FROM CHOLIC ACID

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Chinese Journal of Reactive Polymers 2005年第1期14卷 35-43页

作者： HU Xiangzheng ZHANG Xu WANG Zheng HE Binglin The State Key Laboratory of Functional Polymer materials for Adsorption and Separation Institute of Polymer Chemistry Nankai University Tianjin 300071 China College of Science Tianjin University of Science and Technology Tianjin 300222 China

2＇-methacryloxy-3α, 7α, I2α- trimethacryloyl cholic acid ethyl ester （CAGE4MA） has been prepared from cholic acid. Photo-polymeric resins were prepared from CAGE4MA. 2,2-bis[4-（2-hydroxy-3-methacrylyloxypropoxy）phenyllpropane （bis-GMA） was used for comparison, triethyleneglycol dimethacrylate （TEGDMA） was used as diluent. The polymerization was initiated by camphoroquinone （CQ）/N, N-dimethylaminoethyl methacrylate （DMAEMA） system. The conversion of CAGE4MA was 39% when the reaction time is 60s, which is lower than bis-GMA and TEGDMA. The swelling value of CAGE4MA resin was 0.41% in distilled water, which is much lower than those of bis-GMA resin （2.04%） and TEGDMA resin （4.77%） under the same conditions. Copolymers from CAGE4MA and TEGDMA have been prepared. With the increase of TEGDMA in mixture, the degree of conversion of CA GE4MA and swelling value increased. The swelling values of photocured resins in 0.1mol/L HCl were also measured.

关键词： Cholic acid Modify dental material Swelling and wettability.

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