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RISS 인기검색어
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- 저자 : 석정진(Jung-Jin Seok) (검색결과 2 건)
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SLA 처리한 타이타늄 임플란트의 양극산화와 석회화 순환처리에 의한 표면개질
문소희(So-Hee Moon),석정진(Jung-Jin Seok),소현자(Hyun-Ja So),강대현(Dae-Hyun Kang),이민호(Min-Ho Lee),배태성(Tae-Sung Bae) 대한치과재료학회 2014 대한치과재료학회지 Vol.41 No.3
This study was performed to evaluate the bioactivity of titanium implant modified by anodic oxidation and cyclic precalcification treatments. Twelve SLA-treated titanium implants with dimensions of 4.0 ㎜ in diameter and 11.5 ㎜ in length were used. In order to increase surface area, nanotubular TiO₂ layer were formed via anodic oxidation treatment. After that, the precalcification treatment which was carried out by alternative immersion in solution and Ca(OH)₂ saturated solution for 30 cycles was conducted to induce the precipitation of HAp crystals on the surface. Finally, the specimens were heat-treated for structural stability and elimination of remaining impurities. To investigate the bioactivity of these surface, the specimens were immersed in SBF solution and microstructural change of the surfaces was observed by FE-SEM. In addition, the concentration and the crystal structure of elements present on the surface were analyzed using an energy dispersive X-ray spectroscopy and X-ray diffraction, respectively. Nanotubes formed by anodizing treatment were completely self-arranged with dense structures in which the tubes with a small diameter were formed between the tubes with a relatively large diameter. Calcium phosphate precipitates were interlocked with the porous nanotubular surfaces and partially penetrated into the nanotubes after the cyclic precalcification treatments. Additionally, there was more precipitation of HAp as the result of immersion in the SBF for 5 days. The formation of nanotubular TiO₂ layers on titanium surface followed by HAp precipitation via cyclic precalcification treatments greatly improved bioactivity.
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반복성형이 2 종류 열가압 성형용 글라스-세라믹의 기계적 성질에 미치는 영향
임청하(Chung-Ha Lim),신재우(Jae-Woo Shin),석정진(Jung-Jin Seok),지정희(Jeong-Hui Ji),이민호(Min-Ho Lee),배태성(Tae-Sung Bae) 대한치과재료학회 2014 대한치과재료학회지 Vol.41 No.1
The purpose of this study was to evaluate the effect of repeat processing on the mechanical properties of two pressable glass-ceramic dental materials. IPS e.max ZirPress of apatite-reinforced glass-ceramic material and IPS e.max Press of lithium disilicate-reinforced glass-ceramic material were used in this study. Twenty disc specimens (13.0 mm × 1.5 mm) for each material were prepared by 4 times repeated heat-pressing. Sprue and button parts were reused to make specimens for every repeated heat-pressing. This study compared the biaxial flexural strength, Vickers hardness, fracture toughness, and the X-ray diffraction response. Microstructures were examined using a scanning electron microscope (SEM). IPS e.max Press showed the decrease of the biaxial flexural strength and fracture toughness values and the increase in sizes of the lithium disilicate crystals after repeat processing for 3 times. IPS e.max ZirPress showed the decrease in Vickers hardness value after repeat processing for 2 times. Based on these results of this study, clinically acceptable limits of the repeat number of heat-pressing were twice in the case of the IPS e.max Press and to be once in the case of the IPS e.max ZirPress.
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