• Title/Summary/Keyword: Pure Titanium

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Bone-to-Implant Contact according to the Surface Roughness of the Implants (임플란트의 표면조도가 골융합에 미치는 영향)

  • Choi, Kwi-Hyun;Herr, Yeek;Lee, Man-Sub;Kwon, Young-Hyuk
    • Journal of Periodontal and Implant Science
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    • v.33 no.4
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    • pp.717-728
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    • 2003
  • This study was performed to evaluate the difference of the bone-to-implant contact according to the surface roughness of the implants. Two beagles were used in the experiment. Extraction of the all premolars was performed in the mandible. In 3 months of healing, screw-shaped pure titanium machined surface implants (Implantium(R), Dentium Co. Korea), implants blasted with 45${\mu}m$ $TiO_2$ particles, (Implantium(R), Dentium Co. Korea) and implants blasted with 100${\mu}m$ $TiO_2$ particles (Implantium(R), Dentium Co. Korea) in diameter 3.4mm and length 6mm were installed in the edentulous mandible. Each dog was sacrificed at 4, 12 weeks after placement and then nondecalcified specimens were prepared for histologic analysis. The results of this study were as follows. 1. At 4 , 12 weeks after the surgery, bone-to-implant contact in the surface blasted with $TiO_2$ particles was higher than that in the pure titanium machined surface respectively. 2. Osseointegration in the surface blasted with 45${\mu}m$ $TiO_2$ particles was more increased than that in the surface blasted with 100${\mu}m$ $TiO_2$ particles. 3. Bone-to-implant contact was increased with time independent of surface roughness. 4. Bone formation was in the outfolded area more than inside the threads independent of surface roughness. From the above results, we were able t o find the most bone-to-implant contact in 45${\mu}m$ $TiO_2$ blasted implant.

Biological response of primary rat calvarial cell by surface treatment of Ti-8Ta-8Nb alloy (Ti-8Ta-3Nb 합금의 표면처리에 의한 백서 두개관 세포의 반응)

  • Kim, Hae-Jin;Son, Mee-Kyoung;Park, Ji-Il;Chung, Hyun-Ju;Kim, Young-Joon
    • Journal of Periodontal and Implant Science
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    • v.38 no.4
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    • pp.595-602
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    • 2008
  • Purpose: Ti-6Al-4V alloy is widely used as an implant material because of its good biocompatibility and good mechanical property compared with commercial pure titanium. Otherwise, toxicity of aluminum and vanadium in vivo has been reported. Ti-8Ta-3Nb alloy is recently developed in the R&D Center for Ti and Special Alloys and it was reported that this alloy has high mechanical strength, no cytotoxicity and similar biocompatibility to commercial pure titanium, but many studies are needed for its clinical use. In these experiment, we carried out different surface treatment on each Ti-8Ta-3Nb alloy disks, then cultured cell on it and assessed biological response. Materials and Methods: cpTi, Ti-6Al-4V, Ti-8Ta-3Nb alloy disks were prepared and carried out sandblasting and acid etching (SLA) or alkali-heat treatment (AH) on the Ti-8Ta-3Nb alloy disks. We cultured primary rat calvarial cells on each surface and assessed early cell attachment and proliferation by scanning electron microscopy, cell proliferation, alkaline phosphatase activity. Result: The rates of cell proliferation on the cpTi, Ti-8Ta-3Nb AH disks were higher than others (p<0.05) and alkaline phosphatase activity was significantly enhanced on the Ti-STa-8Nb AH disks(p<0.05). Conclusion: Most favorable cell response was shown on the Ti-8Ta-3Nb AH surfaces. It is supposed that alkali-heat treatment of the Ti-8Ta-3Nb alloy could be induced earlier bone healing and osseointegration than smooth surface.

Development of Manufacturing Process of Pure Titanium Wire to make Eyewear Frame (안경용 순티타늄 wire 제조 공정개발)

  • Choi, Gye-Hun;Kim, Sang-Yeoun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.12 no.3
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    • pp.1105-1110
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    • 2011
  • After pure titanium Ingot(G2) with 400mm in diameter was manufactured, the analysis of its ingredients showed that the oxygen content was 0.073wt% and the iron content was 0.03wt%, which made ASTM Gr.2 standardization satisfactory. The processed titanium ingot produced 42mm wire rod, and hot rolling of 18th phase produced 9mm wire rod. The hardness analysis of 15.8mm wire rod, which was processed in hot rolling of 10th phase from the surface to the center, resulted in almost constant value with Hv150~200. The last 9mm wire rod had a different yield strength and elongation percentage depending on the temperature as it was led in to a hot roller. However, tensile strength revealed an approximate value and made ASTM B863 standardization satisfactory.

The Effect of Process Variables on Mechanical Properties and Formability in GTA Welds of Commercial Pure Titanium Sheet (순 Ti 박판 GTA 용접부의 기계적 성질 및 성형성에 미치는 공정변수의 영향)

  • Kim, Jee-Hoon;Hong, Jae-Keun;Yeom, Jong-Taek;Park, Nho-Kwang;Kang, Chung-Yun
    • Journal of Welding and Joining
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    • v.28 no.4
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    • pp.73-80
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    • 2010
  • In this work, the effect of welding variables on weldability of gas tungsten arc(GTA) welding was investigated with experimental analysis for a commercial pure(CP) titanium (Grade.1). The GTA welding tests on sheet samples with 0.5mm in thick were carried out at different process variables such as arc length, welding speed and electrode shape. In order to search an optimum arc length with full penetration, bead- on-plate welding before butt-welding were performed with different arc length conditions. From the bead- on-plate welding results, the optimum condition considering arc stability and electrode loss was obtained in the arc length of 0.8mm. Butt-welding tests based on the arc length of 0.8mm were carried out to achieve the optimum conditions of welding speed and electrode shape. Optimum conditions of welding speed and electrode shape were suggested as 10 mm/s and truncated electrode shape, respectively. It was successfully validated by the microstructural observation, tensile tests, micro-hardness tests and formability tests.

Evaluation of plastic flow curve of pure titanium sheet using hydraulic bulge test (유압벌지실험을 이용한 순 티탄늄 판재의 소성유동곡선 평가(제2보))

  • Kim, Young-Suk;Kim, Jin-Jae
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.4
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    • pp.718-725
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    • 2016
  • In this study, the plastic flow curve of commercially pure titanium sheet (CP Ti) actively used in the plate heat exchanger etc., was evaluated. The plastic flow curve known as hardening curve is a key factor needed in conducting finite element analyses (FEA) for the forming process of a sheet material. A hydraulic bulge test was performed on the CP Ti sheet and the strain in this test was measured using the DIC method and ARAMIS system. The measured true stress-true strain curve from the hydraulic bulge test (HBT) was compared with that from the tensile test. The measured true stress-true strain curve from the hydraulic bulge test showed stable plastic flow curve over the strain range of 0.7 which cannot be obtained in the case of the uniaxial tensile test. The measured true stress-true strain curve from the hydraulic bulge test can be fitted well by the hardening equation known as the Kim-Tuan model.

Surface Characteristics of Titanium/Hydroxyapatite Double Layered Coating on Orthopedic PEEK by Magnetron Sputtering System (마그네트론 스퍼터링 시스템을 이용한 정형외과용 PEEK의 타이타늄/하이드록시아파타이트 이중 코팅층의 표면 특성 분석)

  • Kang, Kwan-Su;Jung, Tae-Gon;Yang, Jae-Woong;Woo, Su-Heon;Park, Tea-Hyun;Jeong, Yong-Hoon
    • Journal of the Korean institute of surface engineering
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    • v.51 no.3
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    • pp.164-171
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    • 2018
  • In this study, we have fabricated pure titanium (Ti)/hydroxyapatite (HA) double layer coating on medical grade PEEK from magnetron sputtering system, an investigation was performed whether the surface can be had more improve bio-active for orthopedi/dental applications than that of non-coated one. Pure Ti and HA coating layer were obtained by a radio-frequency and direct current power magnetron sputtering system. The microstructures surface, mechanical properties and wettability of the pure Ti/HA double layer deposited on the PEEK were analyzed by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), nano-indentation, and contact angle test. According to the EDS and XRD results, the composition and crystal structure of pure Ti and HA coated surface were verified. The elastic modulus and hardness value were increased by pure Ti and HA coating, and the pure Ti/HA double layer coating surface has the highest value. The contact angle showed higher value for pure Ti/HA double layered coating specimens than that of non-coated (PEEK) surface.

Effects of Cooling Method Followed by Casting on the Interfacial and Mechanical Properties of Dental CP-Ti Casts (치과용 티타늄 주조체의 냉각방법이 표면반응층 및 기계적 특성에 미치는 영향)

  • Moon, Soo;Jung, Jun-Young;Kim, Ki-Ju;Lee, Jin-Hyung
    • Journal of Biomedical Engineering Research
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    • v.24 no.5
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    • pp.375-380
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    • 2003
  • In this study. we have intended to control the properties of surface reaction zone generated between pure titanium and oxide investment moulds. Commercially pure titanium was centrifugally casted and silica$.$alumina based phosphate bonded investment was used as the mould material. The effect of cooling methods after casting on the surface reaction zone and mechanical properties of casts were investigated. The resulting casts showed the multilayered surface reaction zone regardless of cooling method. Especially. water cooling method produced the titanium casts with thinner surface reaction zone. weaker strength. and higher elongation properties compared to air cooling. It can thus be known that the resulting casts had satisfactory mechanical properties as dental materials. From these results, the cooling rate dependence of interfacial and mechanical properties can be attributed to the diffusion of oxygen from casting environment, which control the reaction of titanium and mould.

The Micromorphometric change of the GBA and RBM implant surface conditioned with tetracycline-HCI (염산테트라싸이클린 적용시간에 따른 GBA 및 RBM 임프란트 표면변화)

  • Park, Kang-Hun;Herr, Yeek;Kwon, Young-Hyuk;Park, Joon-Bong;Chung, Jong-Hyuk
    • Journal of Periodontal and Implant Science
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    • v.36 no.3
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    • pp.705-716
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    • 2006
  • The present study was performed to evaluate the effect of tetracycline-HCl on the change of implant surface microstructure according to application time. Implant with pure titanium machined surface, GBA surface and RBM surface were utilized. Implant surface was rubbed with 50mg/ml tetracycline-HCl solution for ${\frac{1}{2}}$min. 1min. $1{\frac{1}{2}}$min. 2min. and $2{\frac{1}{2}}$min. respectively in the test group. Then, specimens were processed for scanning electron microscopic observation. The results of this study were as follow. 1. Both test and control group showed a few shallow grooves and ridges in pure titanium machined surface implants. There were not significant differences between two group. 2. In GBA surfaces, control group exhibit many porous depression, and each depression were divided by strict border. Experimental group applied with tetracycline-HCl for 2min. were similar with control group. But when applied for $2{\frac{1}{2}}$min. surface alteration and border breakdown started, resulting enlargement of the porous depression. 3. In REM surface, control group exhibit rough, uneven surface with crater-like depression can be found. The surface alteration started when tetracycline-HCl was applied for 30sec. resulting breakdown of the crater-like depression. Depression became larger as applying time increased.

Micromorphometric change of implant surface conditioned with tetracycline-HCI : $FBR^{(R)}$ and CeliNest surface (표면처리 시간에 따른 임프란트 미세구조의 변화 : $FBR^{(R)}$과 CellNest 표면 임프란트)

  • Chang, Dong-Wook;Park, Joon-Bong;Kwon, Young-Hyuk;Herr, Yeek;Chung, Jong-Hyuk
    • Journal of Periodontal and Implant Science
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    • v.36 no.3
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    • pp.717-729
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    • 2006
  • The present study was performed to evaluate the effect of tetracycline-BCL on the change of implant surface microstructure according to application time. Implant with pure titanium machined surface, double coated $FBR^{(R)}$ surface and oxidized CellNest surface were utilized. Implant surface was rubbed with $50mg/m{\ell}$ tetracycline-BCL solution for ${\frac{1}{2}}$, 1, $1{\frac{1}{2}}$, 2 and $2{\frac{1}{2}}$min. respectively in the test group. Then, specimens were processed for scanning electron microscopic observation. The results of this study were as follows. 1. Both test and control group showed a few shallow grooves and ridges in pure titanium machined surface implants. There were not significant differences between two groups. 2. The double coated $FBR^{(R)}$ surfaces showed fine crystalline structures. The roughness of surfaces conditioned with tetracycline-BCL was lessened relative to the application time. 3. The oxidized CellNest surfaces showed the porous structures. The surface conditioning with tetracycline-BCI influenced on its micro-morphology. In conclusion, the detoxification of the affected implant surface with $50mg/m{\ell}$ tetracycline-BCL should be applied respectively with different time according to various implant surfaces.

Micromorphometric change of implant surface conditioned with Tetracycline-HCl : HA and Etched surface (염산테트라싸이클린의 적용시간에 따른 특수 가공된 임프란트 표면 변화)

  • Han, Ju-Young;Park, Joon-Bong;Kwon, Young-Hyuk;Herr, Yeek;Chung, Jong-Hyuk
    • Journal of Periodontal and Implant Science
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    • v.36 no.3
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    • pp.731-744
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    • 2006
  • The present study was performed to evaluate the effect of tetracycline-HCl on the change of implant surface microstructure according to application time. Implant with pure titanium machined surface, HA-coated surface and dual acid etched surface were utilized. Implant surface was rubbed with $50mg/m{\ell}$ tetracycline-HCL solution for ${\frac{1}{2}}$min., 1min., $1{\frac{1}{2}}$min., 2min., and $2{\frac{1}{2}}$min. respectively in the test group. Then, specimens were processed for scanning electron microscopic observation. The results of this study were as follows. 1. Both test and control group showed a few shallow grooves and ridges in pure titanium machined surface implants. There were not significant differences between two groups. 2. In HA-coated surfaces, round particles were deposited irregularly. The roughness of surfaces conditioned with tetracycline-HCL was lessened and the cracks were increased relative to the application time. 3. The etched surfaces showed the honey comb structures. The surface conditioning with tetracycline-HCI didn't influence on its micro-morphology. In conclusion, the detoxification with $50mg/m{\ell}$ tetracycline-HCI must be applied respectively with different time according to various implant surfaces.