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Sin Guen Kim,Sung Chul Bok,Suk In Choi,Jun Woo Park,Dong Ju Choi 대한구강악안면외과학회 2024 대한구강악안면외과학회지 Vol.50 No.2
A 22-year-old male patient presented to the clinic with severe pain in the preauricular area with an inability to completely occlude the jaw. Facial computed tomography and magnetic resonance imaging revealed a well-defined lesion that was tentatively diagnosed as a benign tumor or cystic mass. Surgical approach of a lesion in the condyle is delicate and problematic as many vulnerable anatomical structures are present. There are several methods for surgery in this area. Typically, an extraoral approach is dangerous because of potential injuries to nerves and arteries. The intraoral approach also presents difficulties due to the lack of visibility and accessibility. On occasion, coronoidectomy may be performed. The goal here was to determine an easier and safer new surgical approach to the condyle. We reached the anterior part of the pterygoid plate in the same method as in Le Fort I surgery. From this point, through the external pterygoid muscle, approaching the anterior aspect of the condyle is relatively easy and safe, with minimal damage to the surrounding tissues. Pus was drained at the site, and the lesion was diagnosed as an abscess. Pain and inability to close the mouth resolved without recurrence.
A Study on the Effects of Lonicera japonica Components on Bone Formation
Sin-Guen Kim,Byeong-Gi Park,Nam Hee Hong,Yoon Soo Gong,Yong Su Kim,Tai Gyu Kwon,Jun-Woo Park,Dong-Ju Choi 대한예방치과학회 2015 International Journal of Clinical Preventive Denti Vol.11 No.3
Objective: In case of placing implant on infectious circumstances may be occurred which is the main causes of implant failure. Because of this reason, surgeons have stresses to control infections during surgery. We used the Lonicera japonica abstract for this purpose and want to find the real effect of L. Japonica on infectious situation. Methods: Evaluating the toxicity and bone forming ability of luteolin, the MTT assay was carried out with a concentration of luteolin used in previous studies evaluating cytotoxicity in osteoblasts. And also alkaline phosphatase (ALP) activity with MG63 cells were used to evaluate the increase in ALP activity. Total number of 28 implants Implant was placed in 14 rabbits tibia and to check bone formation activity, histological test and removable torque test was also done. Control group: implant placement without treatment of the bone defect area. Experimental group 1: implant placement with bone graft material. Experimental group 2: implant placement with bone graft material after infection with Staphylococcus aureus. Experimental group 3: implant placement with bone graft material after infection with S. aureus and luteolin treatment. Results: We found that there is a significant difference between the mean value of implant removal force (removal torque) for each group (p=0.007). The amount of bone formation in experimental groups 2 and 3 were significantly different which suggested that luteolin enhanced bone formation in the presence of bone graft infection. Conclusion: In this study we investigated about the luteolin, which is one of the anti-microbial and anti-inflammatory components of L. japonica, that it’s activity on promotion of bone formation when it was applied to infectious circumstances. And we also investigate the possibility of application of luteolin to human cells.
매우 얇은 치조골에서 치조능 분할 확장술을 통한 임플란트 치료
김신근(Sin-Guen Kim),이희성(Hee-Sung Lee),박종욱(Jong-Wook Park),남종훈(Jong-Hoon Nam),복성철Sung-Cheol Bok),박기남(Ki-Nam Park),최동주(Dong-Ju Choi) 대한구강악안면외과학회 2011 대한구강악안면외과학회지 Vol.37 No.3
For implant treatment there must be sufficient bone to house the implant body. At least 5mm wide residual bone is needed and usually a 6mm width is preferred by clinicians. However, surgeons sometimes find patients with a narrow ridge, which makes it difficult to place an implant. Therefore, many clinicians perform bone graft or a ridge splitting technique to overcome these poor conditions. The time and cost can be reduced using the ridge splitting technique with immediate implant placement. Recently, many studies reported reliable consequences of ridge splitting technique. This paper reports a successful of implant placement with a ridge splitting technique in a very thin alveolar ridge.
Damage on Wheat Growth and Yield by Sharp Eyespot (Rhizoctonia Cerealis) in Wheat Fields
Jong-Chul Park,Eun-Suk Lee,Hak-Sin Kim,Chun-Sik Kang,Chul-Soo Park,Jung-Jun Lee,Jun-Hee Lee,Young Guen-Cheong,Tae-Il Park,Tae-Soo Kim,Ki-Jong Kim,Jung-Gon Kim 한국작물학회 2010 한국작물학회 학술발표대회 논문집 Vol.2010 No.04
In April 2009 two wheat cropping fields, Jeonju and Gimje in Jeonbuk Province, showed yellowish leaves and dead tillers in stem bases with sharp lens-shaped darken lesions. The disease incidence in wheat cultivar Jopummil ranged from 2.2 to 43.5%, with a mean incidence of 28.5%. The different incidence was related the seeding date. Earlier seeding (15th October) fields showed severe incidence as 25.5 to 43.5% while late seeding around the end of October weakened incidence in the cultivar. Based on morphology and pathogenic characteristics, the fungus was identified as Rhizoctonia cerealis that causes sharp eyespot in wheat. The disease severely affected growth and yield including culm length, spike length, number of kernel. The average culm length of the infected cv. Jopummil was 66 cm while that of healthy plant was 74 cm. The number of kernel and tiller per unit area was decreased only in the case of more than 13% incidence, but the length of heads was not significantly different compared with that of the healthy plants.
( Jae Hyung Park ),( Joong Goo Kwon ),( Sun Joo Kim ),( Dae Kyu Song ),( Seok Guen Lee ),( Eun Soo Kim ),( Kwang Bum Cho ),( Byung Ik Jang ),( Dae Hwan Kim ),( Jeong Im Sin ),( Tae Wan Kim ),( In Hwan 대한소화기기능성질환·운동학회 2015 Journal of Neurogastroenterology and Motility (JNM Vol.21 No.1
Background/Aims Inflammatory bowel disease is commonly accompanied by colonic dysmotility and causes changes in intestinal smooth muscle contractility. In this study, colonic smooth muscle contractility in a chronic inflammatory condition was investigated using smooth muscle tissues prepared from interleukin-10 knockout (IL-10./.) mice. Methods Prepared smooth muscle sections were placed in an organ bath system. Cholinergic and nitrergic neuronal responses were observed using carbachol and electrical field stimulation with L-NG-nitroarginine methyl ester (L-NAME). The expression of interstitial cells of Cajal (ICC) networks, muscarinic receptors, neuronal nitric oxide synthase (nNOS) and inducible nitric oxide synthase (iNOS) was observed via immunofluorescent staining. Results The spontaneous contractility and expression of ICC networks in the proximal and distal colon was significantly decreased in IL-10./. mice compared to IL-10+/+ mice. The contractility in response to carbachol was significantly decreased in the proximal colon of IL-10./. mice compared to IL-10+/+ mice, but no significant difference was found in the distal colon. In addition, the expression of muscarinic receptor type 2 was reduced in the proximal colon of IL-10./. mice. The nictric oxide-mediated relaxation after electrical field stimulation was significantly decreased in the proximal and distal colon of IL-10./. mice. In inflamed colon, the expression of nNOS decreased, whereas the expression of iNOS increased.Conclusions These results suggest that damage to the ICC network and NOS system in the proximal and distal colon, as well as damage to the smooth muscle cholinergic receptor in the proximal colon may play an important role in the dysmotility of the inflamed colon.
Study of a “wing-type” implant on stress distribution and bone resorption at the alveolar crest
Jong-Wook Park,Sin-Guen Kim,Dong-Won Choi,Mi-Ra Choi,Youn-Jin Yoon,Jun-Woo Park,Dong-Ju Choi 대한구강악안면외과학회 2012 대한구강악안면외과학회지 Vol.38 No.6
Objectives: Implants connect the internal body to its external structure, and is mainly supported by alveolar bone. Stable osseointegration is therefore required when implants are inserted into bone to retain structural integrity. In this paper, we present an implant with a “wing” design on its area. This type of implant improved stress distribution patterns and promoted changes in bone remodeling. Materials and Methods: Finite element analysis was performed on two types of implants. One implant was designed to have wings on its cervical area, and the other was a general root form type. On each implant, tensile and compressive forces (30 N/m 2 , 35 N/m 2 , 40 N/m 2 , and 45 N/m 2 ) were loaded in the vertical direction. Stress distribution and displacement were subsequently measured. Results: The maximum stresses measured for the compressive forces of the wing-type implant were 21.5979 N/m 2 , 25.1974 N/m 2 , 29.7971 N/m 2 , and 32.3967 N/m 2 when 30 N/m 2 , 35 N/m 2 , 40 N/m 2 , and 45 N/m 2 were loaded, respectively. The maximum stresses measured for the root form type were 23.0442 N/m 2 , 26.9950 N/m 2 , 30.7257 N/m 2 , and 34.5584 N/m 2 when 30 N/m 2 , 35 N/m 2 , 40 N/m 2 , and 45 N/m 2 were loaded, respectively. Thus, the maximum stresses measured for the tensile force of the root form implant were significantly higher (about three times greater) than the wing-type implant. The displacement of each implant showed no significant difference. Modifying the design of cervical implants improves the strength of bone structure surrounding these implants. In this study, we used the wing-type cervical design to reduce both compressive and tensile distribution forces loaded onto the surrounding structures. In future studies, we will optimize implant length and placement to improve results. Conclusion: 1. Changing the cervical design of implants improves stress distribution to the surrounding bone. 2. The wing-type implant yielded better results, in terms of stress distribution, than the former root-type implant.
김신근,박종욱,남종훈,복성철,이영만,박기남,최동주,Kim, Sin-Guen,Park, Jong-Wook,Nam, Jong-Hoon,Bok, Sung-Cheol,Lee, Young-Man,Park, Ki-Nam,Choi, Dong-Ju 대한악안면성형재건외과학회 2011 Maxillofacial Plastic Reconstructive Surgery Vol.33 No.5
Cemento-Osseous dysplasia is a benign condition of the jaw known to orginate from the periodontal ligament or medullary bone. Its treatment can be categorized according to clinical symptom. If there is no pain or other discomfort, a regular recall examination and having patients maintain proper oral hygeine are the best management. However, if clinical symptoms do exist, proper treatments such as resectioning of the mandible or mandibulectomy are needed. This clinical report describes a rare symptomatic case of cemento-osseous dysplasia which was treated with a conservative surgical method. Using this method, we obtained satisfactory results without additional grafts.