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이환규,김준영,김성룡,박진후,정휘동,정영수 대한치과의사협회 2022 대한치과의사협회지 Vol.60 No.10
Alveolar cleft is a congenital anomaly with a frequency of 0.18-2.50 per 1,000 births, which invades the bone of maxillary arch. Iliac crestal bone graft, considered as the gold standard for treatment of alveolar cleft, is a commonly used material due to its abundant mass, ease of harvesting, and the advantages of simultaneous operation with alveolar cleft reconstruction surgery. Despite many advantages of Iliac crestal bone graft, many studies have been conducted on alternative and additional materials for secondary alveolar bone graft in consideration of the disadvantages of iliac crest bone graft. Autogenous bone grafts from other donor sites, such as cranium, mandible and tibia can be used as an alternative with lower morbidity and lower bone resorption. Bone-tissue engineering strategies such as scaffolds, growth factors have also shown promising results in treatment of alveolar cleft. In addition, the use of Platelet-Rich-Fibrin/Plasma with abundant growth factors and osteoinducibility can increase bone maintenance and achieve better results. Therefore, here we review the various bone graft methods used in reconstruction of alveolar cleft.
폐 티타늄 칩으로부터의 이산화티탄 분말 제조 및 광촉매 특성에 관한 연구
이환규,정운조,안호근 한국환경기술학회 2019 한국환경기술학회지 Vol.20 No.2
Metal titanium is processed to be used in a variety of industries. In the processing, 40∼50% of the metal titanium is spent as titanium chips and scraps. In this study, TiO2 powder was prepared using the spent titanium chips by modified sol-gel method. The spent titanium chip was dissolved in HCl solution. After filtering, NH4OH solution with various concentrations was added respectively. TiO2 powders after filtering were calcined at 200 ℃, 400 ℃, and 600 ℃, respectively. Photocatalytic property of the TiO2 powder was evaluated as decomposition rate for methylene blue(MB) using a liquid phase stirred reactor. XRD patterns for the TiO2 powders calcined at 400 ℃ and 600 ℃ indicated that the crystal structure was mixed type with rutile and anatase. BET surface area of TiO2 powders decreased with increasing calcination temperature, and was not correlated with the concentration of NH4OH solution. Photocatalytic efficiency of the prepared TiO2 powder depended highly on concentration of NH4OH solution, and was the highest when prepared with 8M-NH4OH solution. The calcination temperature was higher, the decomposition rate was lower. The TiO2 powder calcined at 200 ℃ using 8M-NH4OH solution showed the highest efficiency. The decomposition rate at decomposition time of 2hr and MB concentration of pH 8 was 97.9 %.