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엄민식,박원우,서승철,이진호,조주연,최혜영,이찬희,임소덕 白中央醫療院 2005 仁濟醫學 Vol.26 No.1
Relapsing polychondritis is an uncommon multisystemic disease which is characterized by recurrent episodes of inflammation and progressive destruction of cartilaginous tissue. The cause of relapsing polychondritis is unclear and suspected to be autoimmune pathophysiology. It involves cartilage of nose, vertebra, trachea, peripheral joint as well as structures of eye, heart, blood vessels or inner ear. Auricular chondritis is present in almost all patients, and multiple arthritis, nasal chondritis, saddle nose, eye involvement, laryngotracheal involvement and skin manifestations are also present. We report a case of relapsing polychondritis presented a arthritis with review of literatures.
( So-won Uhm ),( In-seok Lee ),( Bo-hyun Kim ),( Young-joon Kim ) 조선대학교 치의학연구원(구 조선대학교 구강생물학연구소) 2021 Oral Biology Research (Oral Biol Res) Vol.45 No.2
Er:YAG laser irradiation can modify the surface characteristics of titanium surface. This study aimed to evaluate the influence of Er:YAG laser irradiation on mechanical, chemical, and biological characteristics of resorbable blast media (RBM) titanium surfaces. RBM disks were divided into 4 groups. Control groups were nonirradiated RBM disks. Laser irradiated groups were divided into the RBM-50, RBM-100, and RBM-250 group which irradiated Er:YAG laser at energy level 50, 100, and 250 mJ/pulse, respectively. In scanning electron microscopy (SEM) images, whereas the RBM-50 group showed slightly melted surface area, RBM-100 and RBM- 250 groups showed broken areas caused by Er:YAG laser. Laser irradiated groups had significantly higher roughness than the control group. The roughness of the RBM-50 group was comparable with the RBM-100 group and significantly lower than the RBM-250 group (p<0.05). In X-ray diffractometer analysis of the laser irradiated group, Ti (002) (rutile) proportion to Ti (101) (anatase) was decreased according to energy level. In X-ray photoelectron spectroscopy analysis, RBM-50 and RBM-100 groups show the crystal change from acidic Ti-OH to basic Ti-OH. MC3T3-E1 cells of all groups adhered and proliferated well on the surfaces and their morphology was not different between groups in SEM images. The alkaline phosphatase activity levels of RBM-50 and RBM-100 groups showed higher than those of the control group (p<0.05). Therefore, within the limitations of this study, Er:YAG laser irradiation at low energy levels can modify mechanical and chemical characteristics of the RBM surface, leading to improve the biological responses of osteoblastic cells on the surface.
Er:YAG 레이저 조사가 티타늄의 표면특성에 미치는 영향
엄소원 ( So Won Uhm ),선영곤 ( Young Gon Sun ),이화선 ( Hwa Sun Lee ),김영준 ( Young Joon Kim ) 조선대학교 치의학연구원 2014 Oral Biology Research (Oral Biol Res) Vol.38 No.2
Purpose: The purpose of this study was to evaluate the changes in physical properties of commercially pure titanium (cp-Ti) after undergoing a Er:YAG laser irradiation. Materials and Methods: Ti specimens were prepared in disks with 15 mm diameter and 2 mm thickness. These were divided into 3 groups: 1) group Ti-50: 50 mJ/pulse laser irradiation, 2) group Ti-100: 100 mJ/pulse laser irradiation, and 3) group Ti-250: 250 mJ/pulse laser irradiation. The control was untreated cp-Ti surface. Scaning electron microscopy (SEM) and atomic forced microscopy were used to observe the changes in surface configuration, X-ray diffraction (XRD) was used to analyze its composition. Furthermore, in order to find out more about its hydrophilic properties, contact angle measurement was performed. Results: SEM images showed that linear depressions of cp-Ti’s surface were increased as the power of laser increased. XRD analysis showed a stable formation of TiO2. Cp-Ti with the laser treatment showed smaller water contact angle than control (p<0.05). Conclusion: With all the results combined, it was suggest that Er:YAG laser irradiation could improve its physical properties which was more favorable in its cellular response.