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Setting kinetics and mechanical properties of flax fibre reinforced glass ionomer restorative materials

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The Journal of Biomedical Research 2017年第3期31卷 264-272页

作者： Ensanya Ali Abou Neel Anne M.Young Division of biomaterials Conservative Dental Sciences DepartmentKing Abdualziz University biomaterials department Faculty of DentistryTanta University Division of biomaterials and Tissue Engineering UCL Eastman Dental Institute

Regardless of the excellent properties of glass ionomer cements,their poor mechanical properties limit their applications to non-load bearing *** study aimed to investigate the effect of incorporated short,chopped and randomly distributed flax fibers（0,0.5,1,2.5,5 and 25 wt%） on setting reaction kinetics,and mechanical and morphological properties of glass ionomer *** of flax fibers did not significantly affect the setting reaction *** to their content,flax fibers increased the compressive（from 148 to 250 MPa） and flexure strength（from 20 to 42 MPa）.They also changed the brittle behavior of glass ionomer cements to a plastic *** significantly reduced the compressive（from 3 to 1.3 GPa） and flexure modulus（from 19 to 14 GPa）.Accordingly,flax fiber-modified glass ionomer cements could be potentially used in high-stress bearing areas.

关键词： setting kinetics flax fibre glass ionomer cements

Nanostructure and corrosion behaviors of nanotube formed Ti-Zr alloy

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中国有色金属学会会刊：英文版 2009年第4期19卷 1005-1008页

作者： Won-Gi KIM Han-Cheol CHOE department of dental Materials & Research Center of Nano-Interface Activation for biomaterials College of DentistryChosun University

In order to investigate the nanostructures and corrosion behaviors of Ti-Zr alloys,nanotube formed Ti-Zr(10%,20%,30% and 40% in mass fraction) alloys were prepared by arc melting and the condition of controlling nanostructure was at 1 000 ℃ for 24 h in argon atmosphere;formation of nanotubes was conducted by anodizing a Ti-Zr alloy in H3PO4 electrolyte with a small amount of fluoride ions at room *** corrosion properties of specimens were examined through potentiodynamic test(potential range of -1 500-2 000 mV) in 0.9% NaCl solution by using *** of the alloys were observed by optical microscope(OM),field emission scanning electron microscope(FE-SEM) and X-ray diffractometer(XRD).Diameter of nanotube does not depend on Zr content,but interspace of nanotube predominantly depends on Zr content,which confirms that ZrO2 oxides play a role to increase the interspace of nanotube formed on the surface.

关键词：钛锆合金纳米结构腐蚀行为扫描电子显微镜 NaCl溶液阳极氧化光学显微镜 X射线衍射

Influence of surface roughness on the color of dental-resin composites

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2011年第7期12卷 552-562页

作者： Razvan GHINEA Laura UGARTE-ALVAN Ana YEBRA Oscar E.PECHO Rade D.PARAVINA Maria del Mar PEREZ department of Optics Faculty of ScienceUniversity of Granada department of Stomatology Faculty of OdontologyUniversity of Granada Houston Center for biomaterials and Biomimetics & department of Restorative Dentistry and biomaterials University of Texas Dental Branch at Houston

This study deals with the influence of surface roughness on the color of resin *** resin composites (microfilled,hybrid,and microhybrid) were each polished with 500-grit,1 200-grit,2 000-grit,and 4 000-grit SiC *** roughness parameter (Ra) was measured using a Plμ confocal microscope,and field-emission scanning electron microscope (Fe-SEM) images were used to investigate filler *** was measured using a spectroradiometer and a D65 standard illuminant (geometry diffuse/0° specular component excluded (SCE) mode).Surface roughness decreased with grit number and was not influenced by filler size or size distribution.A significant influence of Ra on lightness (L*) was *** increased with decreases in roughness,except for specimens that underwent polishing procedure 4 (PP4;500-grit,1 200-grit,2 000-grit,and 4 000-grit SiC papers consecutively).Generally,it was found that surface roughness influenced the color of resin *** composites that underwent PP1 (500-grit SiC paper) exhibited significant differences in chroma (C*),hue (h°),and lightness (L*) compared to composites that underwent PP3 (500-grit,1 200-grit,and 2 000-grit SiC papers consecutively) and *** difference (E*) between the polishing procedures was within acceptability thresholds in dentistry.

关键词： Color measurement dental resin composites Roughness

Electrochemical behavior of dental implant system before and after clinical use

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中国有色金属学会会刊：英文版 2009年第4期19卷 846-851页

作者： Chae-Heon CHUNG Hee-Jung KIM Yong-Tae JEONG Mee-Kyoung SON Yong-Hoon JEONG Han-Cheol CHOE department of Prosthodontics College of DentistryChosun University department of dental Materials & Research Center of Nano-Interface Activation for biomaterials College of DentistryChosun University

Electrochemical behavior of dental implant system before and after clinical use(in vivo and in vitro) was researched by using abutment and titanium *** simulate an oral environment,the samples of clinically used and non-used implant systems as a working electrode were exposed to artificial saliva at(36.5±1) ℃.Electrochemical tests were carried out using a *** electrochemical test,the corrosion morphology of each sample was investigated by FE-SEM and *** corrosion potential and pitting potential of clinically used implant system are lower than those of non-used implant system,and clinically used implant system exhibits a lower range of passivation,indicating a less degree of inherent resistance against chloride *** polarization resistance decreases in the case of clinically used implant system,whereas,Rp for clinically non-used implant system increases compared with clinically used implant system.

关键词：电化学行为种植制度临床应用使用制度临床使用电化学测试夹具系统腐蚀形态

Effects of TiN film coating on electrochemical behaviors of nanotube formed Ti-xHf alloys

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中国有色金属学会会刊：英文版 2009年第4期19卷 857-861页

作者： Kang LEE Won-Gi KIM Joo-Young CHO Sang-Won EUN Han-Cheol CHOE department of dental Materials & Research Center of Nano-Interface Activation for biomaterials College of DentistryChosun University department of Applied Advanced Materials Korea Polytechnic Ⅴ Colleges

Ti-xHf(x=10%,20%,30% and 40%,mass fraction) alloys were prepared by arc melting,and the microstructure was controlled for 24 h at 1 000 ℃ in argon *** formation of nanotube was conducted by anodizing on Ti-Hf alloys in 1.0 mol/L H3PO4 electrolytes with small amounts of NaF at room *** then TiN coatings were coated by DC-sputtering on the anodized *** and nanotube morphology of the alloys were examined by field emission scanning electron microscopy(FE-SEM) and X-ray diffractometry(XRD).The corrosion properties of the specimens were examined through potentiodynamic test(potential range from -1 500 to 2 000 mV) in 0.9 % NaCl solution by *** microstructure shows the acicular phase and α' phase with Hf *** amorphous oxide surface is transformed to crystalline anatase *** coated nanotube surface has a good corrosion resistance.

关键词：氮化钛涂层合金制备纳米管电化学行为薄膜包衣 0.9%NaCl溶液扫描电子显微镜微观结构

Effects of pore interconnectivity on bone regeneration in carbonate apatite blocks

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Regenerative biomaterials 2022年第1期9卷 30-40页

作者： Maab Elsheikh Ryo Kishida Koichiro Hayashi Akira Tsuchiya Masaya Shimabukuro and Kunio Ishikawa department of biomaterials Faculty of Dental ScienceKyushu University3-1-1 Maidashi Higashi-kuFukuoka 812-8582Japan

Porous architecture in bone substitutes,notably the interconnectivity of pores,is a critical factor for bone ***,controlling the pore interconnectivity while maintaining the microarchitecture has not yet been achieved using conventional methods,such as ***,we fabricated a porous block using the crystal growth of calcium sulfate dihydrate,and controlled the pore interconnectivity by limiting the region of crystal *** calcium sulfate dihydrate blocks were transformed to bone apatite,carbonate apatite(CO_(3)Ap)through dissolution–precipitation ***,CO_(3)Ap blocks with 15%and 30%interconnected pore volumes were obtained while maintaining the microarchitecture:they were designated as CO_(3)Ap-15 and CO_(3)Ap-30,*** 4 weeks after implantation in a rabbit femur defect,new bone formed throughout CO_(3)Ap-30,whereas little bone was formed in the center region of CO_(3)*** 12 weeks after implantation,a large portion of CO_(3)Ap-30 was replaced with new bone and the boundary with the host bone became *** contrast,CO_(3)Ap-15 remained in the defect and the boundary with the host bone was still ***,the interconnected pores promote bone ingrowth,followed by replacement of the material with new *** findings provide a useful guide for designing bone substitutes for rapid bone regeneration.

关键词： bone substitutes carbonate apatite pore interconnectivity bone regeneration

In-vitro bioactivity evaluation and physical properties of an epoxy-based dental sealer reinforced with synthesized fluorine-substituted hydroxyapatite, hydroxyapatite and bioactive glass nanofillers

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Bioactive Materials 2019年第1期4卷 322-333页

作者： Bahaa Abdulrazzaq Jerri Al-Bakhsh Farhad Shafiei Atieh Hashemian Kiana Shekofteh Behnam Bolhari Marjan Behroozibakhsh department of dental biomaterials School of DentistryTehran University of Medical SciencesTehranIran department of Conservative Dentistry Dental School of University of BasraBasraIraq department of dental biomaterials School of Dentistry/Research Center for Science and Technology in MedicineTehran University of Medical SciencesTehranIran department of Endodontic School of DentistryTehran University of Medical SciencesTehranIran

The purpose of this study was to evaluate the physical properties and bioactivity potential of epoxy-based dental sealers modified with synthesized bioactive glass(BAG),hydroxyapatite(HA)and fluorine substituted hydroxyapatite(FHA)*** synthesized powders were incorporated at 10%and 20%into the epoxy-based dental *** setting time,flow and solubility and microhardness of the modified and unmodified samples were *** bioactivity was evaluated using FESEM-EDX and elemental mapping,ATR-FTIR and *** flow value of all of the experimental groups except the FHA modified samples,was greater than 20 *** solubility,no specimens exhibited more than 1%weight *** solubility value of the FHA groups was statistically significant lower than other groups(p≤0.001).The mean hardness values of all of the modified samples were significantly higher than the unmodified group(p≤0.001).Regarding bioactivity,in vitro study revealed that after 3 days immersion in SBF a compact and continuous calcium phosphate layer formed on the surface of epoxy sealers containing BAG and HA *** on these results,the addition of BAG and HA nanoparticles did not adversely alter the physical properties of epoxy ***,they improved the in vitro bioactivity of the epoxy sealer.

关键词： Bioactivity Bioactive glass Epoxy-based dental sealer Hydroxyapatite Fluorine-substituted hydroxyapatite

Carbon Nanotube Coating on Titanium Substrate Modified with TiO_2 Nanotubes

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Journal of Wuhan University of Technology(Materials Science) 2011年第5期26卷 867-871页

作者：白玉 PARK Ilsong BAE Taesung KIM Kyounga WATARI Fumio UO Motohiro LEE Minho department of dental biomaterials School of Dentistry and Institute of Oral BioscienceBrain Korea 21 ProjectChonbuk National University School of Materials Science and Engineering Inner Mongolia University of Technology department of Conservative Dentistry Institute of Oral Bioscience and BK 21 ProjectSchool of DentistryChonbuk National University Biomedical Dental Materials and EngineeringDepartment of Oral Health ScienceGraduate School of Dental MedicineHokkaido University Advanced biomaterials Section Graduate School of Medical and Dental SciencesTokyo Medical and Dental University

A combination of carbon nanotubes （CNTs） and titanium （Ti） modified with TiO2 nanotubes （TiO2 NTs） was fulfilled with the aim of improving bioactivity of Ti ***,well-ordered TiO2 NTs were prepared by the electrochemical anodization of Ti in an ethylene glycol electrolyte containing 1 wt% NH4F and 10 wt% H2O at 20 V for 50 min,followed by ***,the carboxylated CNTs were coated onto the TiO2 NTs using electrophoretic deposition （EPD） *** growth of hydroxyapatite （HA） on the samples was investigated by soaking them in simulated body fluid （SBF）.The result showed the CNTs-coated Ti with the modification of TiO2 NTs （CNTs-TiO2 NTs） was more efficient to induce HA formation than the CNTs-coated smooth Ti （CNTs-Ti）.The vitro cell response was evaluated using osteoblast cells （MC3T3-E1）.The good cell proliferation and strong cell adhesion could be obtained on the CNTs-TiO2 *** results indicated that CNT coating on the Ti modified with TiO2 NTs could be potentially useful for the periodontal ligament combination on dental implants.

关键词： carbon nanotubes TiO2 nanotubes apatite-forming ability cell adhesion

PHOTOCURING STUDY OF NEW dental RESINS BASED ON MULTIFUNCTIONAL ACRYLIC ISOCYANURATE BY PHOTOCALORIMETRY

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Chinese Journal of Polymer Science 1999年第5期17卷 411-415页

作者：聂俊 L.A.Linden J.F.Rabek Institute of Photographic Chemistry Chinese Academy of Sciences Beijing 100101 China department of dental biomaterials Science Karolinska Institute S14104 Huddinge Stockholm

Photocuring of new dental resins composed of tri(2-hydroxyethyl) isocyanurate triacrylate (THITA) alone and its mixtures with trimethylolpropane triacrylate (TMPTA) or pentaerythritol triacrylate (PETA) initiated by camphorquinone/amine system was studied by photocalorimetry. Among several different amines as coinitiators, 2-ethyl-4-dimethylaminobenzoate (AM-3), N,N-dimethylbenzylamine (AM-5) and 2,4,6-[tri(dimethylaminomethyl)]phenol (AM-6) are most effective. Upon irradiation, photopolymerization can occur immediately and no induction period appears in N-2 nor in air. Comparing the THITA/TMPTA and THITA/PETA mixtures, the parameters of photopolymerization and hardness of photocured samples show a small difference and only change slightly with varying molar ratios of mixture. In the presence of inorganic filler, the hardness of photocuring resins is almost the same as that for commercial products.

关键词： multifunctional acrylates photocuring dental resin network