마이크로 아크 산화 표면처리 기술을 활용한 치과도재 소부용 티타늄 인공치아 결합강도 연구

송종법 ( Jong-beop Song ),박종민 ( Jong-min Park ),김종순 ( Jong-soon Kim ),정효경 ( Hyo-kyung Jung ),최원식 ( Won-sik Choi ) 한국산업융합학회 2022 한국산업융합학회 논문집 Vol.25 No.2

The bonding strength [ISO22674] test was conducted by firing a dedicated ceramic powder on the surface of the dental titanium material treated with micro-arc oxidation. In the test group, an average result value of 34.34 MPa was obtained, and in the control group, a result value of 21.53 MPa was obtained. The bonding strength of the test group was higher than that of the control group by 12.81 MPa, resul ting in a 37% improvement in durability of the dental artificial tooth ceramic restoration.

전이금속염 첨가에 의한 판상 α-Al₂O₃ 결정체 제조

송효경,박병기,이정민,Song, Hyo-Kyung,Park, Byung-Ki,Lee, Jung-Min 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.6

[ ${\alpha}-Al_2O_3$ ] precursor was synthesised by sol-gel method using aluminum sulfate, sodium sulfate and sodium carbonate as law materials. The flaky ${\alpha}-Al_2O_3$ crystals were prepared by heating using precursor about $1,050^{\circ}C$. In this study, the effect of some transition-metal sulfate ($FeSO_4,\;SnSO_4,\;ZnSO_4$) addition have been investigated. When iron sulfate was added, it could see that act on impurities in crystal growth process. In case of tin sulfate, distribution of Platelets was very broad. When flaky ${\alpha}-Al_2O_3$ crystals were prepared zinc sulfate addition, thickness, size, and distribution of platelets was suited to industrial application. The average diameter of flaky ${\alpha}-Al_2O_3$ crystals was about 20 $\mu$m, and its thickness was about 0.3 $\mu$m. Increasing addition of zinc sulfate, thickness of ${\alpha}-Al_2O_3$ platelet was decreased.

치과용 임플란트 지대주 나사 구조에 관한 연구

송종법(Jong-Beop Song),최일경(Il-kyung Choi),정효경(Hyo-kyung Jung),권순홍(Soon-Hong Kwon),권순구(Soon-Gu Kwon),박종민(Jong-Min Park),김종순(Jong-Soon Kim),정성원(Sung-Won Jung),최원식(Won-Sik Choi) 한국산업융합학회 2017 한국산업융합학회 논문집 Vol.20 No.2

Dental implants are required to have biomechanical functions and biostability in order to perform authoring, pronunciation, and aesthetic functions in the oral cavity. In terms of biostability, pure titanium for medical have good biostability and no rejection in the alveolar bone. with appropriate strength in terms of strength as well as biocompatibility. In recent years, various surgical methods and devices have been developed to improve the convenience and safety of the procedure. However, as the number of procedures increases, the screw loosening of the abutment screw connecting the artificial root and the abutment There are many reports of artificial root and abutment fracture. Fig. 1 is an example of a case where the upper part of the abutment screw is arbitrarily modified to remove the abutment by the abutment fracture due to the loosening of the abutment screw. The fundamental cause of abduction of the abutment screw is caused by the slight movement due to the lowering of the retention force of the abutment screw. It is necessary to minimize loosening of the abutment screw to avoid problems such as fracture during the period of using the implant. The purpose of this study is to investigate the structure of the abutment screw to prevent the loosening of the abutment screw by forming 0.5mm slot

Cone beam CT 영상과 석고모형 레이저 스캔 영상의 결합을 이용한 안면비대칭자의 치성보상 평가

송효경(Hyo-Kyung Song),손우성(Woo-Sung Son),박수병(Soo-Byung Park),김성식(Seong-Sik Kim),김용일(Yong-Il Kim) 대한치과교정학회 2010 대한치과교정학회지 Vol.40 No.6

본 연구에서는 CBCT 영상과 석고모형 레이저 스캔 영상의 결합하여 안면비대칭자의 치성보상을 3차원적으로 계측하고 비교하였다. 안면비대칭자 30명과 정상교합자 20명을 대상으로 하여, CBCT 영상에서 두개악안면 골격에 대한 기준 좌표계를 설정하고 석고모형 레이저 스캔 영상에서 견치와 제1대구치의 3차원적 위치와 각도를 계측하여 그 차이(dev.-ndev.)를 구하였다. 두 집단을 비교 분석하고 이부 편위량과의 상관 분석을 시행하여 다음과 같은 결과를 얻었다. 안면비대칭군의 편위측 상악 견치는 비편위측에 비해 2.73 ± 4.07 mm 협측에 위치하였고, 편위측 상악 제1대구치는 비편위측에 비해 3.83 ± 0.12 mm 협측에 위치하였으며, 8.26 ± 6.82˚ 협측 경사되어 있었다. 비편위측 상악 제1대구치의 협측교두는 편위측에 비해 1.76 ± 0.11 mm 정출되어 있었다. 편위측 하악 제1대구치는 비편위측에 비해 6.01 ± 0.14 mm 설측에 위치하였고, 비편위측에 비해 8.31 ± 7.07˚ 설측경사되어 있었다 (p < 0.01). 안면비대칭자는 이부 편위량이 증가할수록 상악 제1대구치는 비편위측에 비해 편위측에서 협측 경사가 증가하는 양상을 보였고, 하악 제1대구치는 편위측에서 설측 경사가 증가하는 양상을 보였다. 또한 상악 제1대구치의 모든 교두와 하악 제1대구치의 근심설측 교두의 수직적 위치는 비편위측에서 더 정출되는 경향을 보이며, 하악 견치와 제1대구치의 횡적 위치도 편위측에서 좀 더 설측으로 위치하는 양상을 보였다. 이상의 결과에서 안면비대칭군에서 편위측의 견치와 대구치가 비편위측에 비해 횡적으로 기울어져 있고, 수직적 위치 및 각도의 차이를 보임을 확인하였다. (대치교정지 2010;40(6):373-382) Objective: The purpose of this study was to assess the dentoalveolar compensation in facial asymmetry individuals using an integration of a CBCT image and a laser scanned dental cast image. Methods: The subjects consisted of 30 adults with asymmetric mandibles and 20 adults with symmetric mandibles. The CBCT and laser scanned dental cast images were integrated with a registration technique. Canine and first molar position and angulation were assessed from reference coordinates. The differences between deviated and non-deviated sides were analyzed with the paired t-test. The differences shown according to menton deviation were also statistically analyzed using Pearson correlation analysis. Results: The experimental group showed deviated and non-deviated side differences (dev.-ndev.) in the position and angle of the canine and first molars. Menton deviation showed positive correlation with the deviation side (dev.-ndev.) for the maxillary and mandibular 1st molar angles, negative correlation with the deviation side for the vertical position of the maxillary 1st molars, transverse position of the mandibular canine, transverse position and vertical position of the mesio-lingual cusp of the mandibular 1st molars. Conclusions: The upper and lower canine and first molars of facial asymmetry individuals were compensated, so the transverse position, vertical position, and angle showed differences between the deviated/ non-deviated sides. (Korean J Orthod 2010;40(6):373-382)

Prevalence and treatment of mandibular first molar eruption disturbances

Woo-Sung Son(손우성),Hyo-Kyung Song(송효경),Seong Sik Kim(김성식) 대한치과의사협회 2017 대한치과의사협회지 Vol.55 No.5

Introduction: The aim of the current study was to describe the prevalence and treatment of mandibular first molar eruption disturbances. Methods: A total of 38 mandibular first molars(M1mn) from 36 patients(17 males and 19 females; aged 9 years 2 months?35 years 10 months) were identified from the 13,391 patients that received orthodontic treatment from 1983?2012. The subjects were classified into 3 categories based on panoramic radiographic examination: impaction due to ectopic position of the tooth germ relative to the contra-side same tooth(Group 1), impaction due to obstruction of the eruption path with cyst or calcium mass (Group 2), and primary and secondary retention due to defects in the follicle or periodontal ligament(PDL; Group 3). The treatment outcomes were evaluated into four categories: no treatment(A), orthodontic traction(B), autotransplantation(C), and extraction due to orthodontic traction failure(D). Results: The prevalence rate of M1mn eruption disturbances in this sample was 0.27%. In Groups 1 and 2, most of the impacted M1mn were erupted successfully by orthodontic traction. In Group 3, most of the retained M1mn were failed to erupt and recommended for extraction. Conclusions: Treatment prognosis was favorable on Group 1 & 2 than Group 3. After removing an element of the cause in case of Group 1 & 2, orthodontic traction or periodic observation will be recommended.

교정장치를 부착한 환자에서 표준진료지침의 구강위생관리능력 개선효과

손우성 ( Woo Sung Son ),김용일 ( Yong Il Kim ),송효경 ( Hyo Kyung Song ),김진범 ( Jin Bom Kim ) 대한예방치과·구강보건학회 2010 大韓口腔保健學會誌 Vol.34 No.2

Objectives. The purpose of this study is to evaluate the effect of the oral hygiene education using the newly designed clinical pathway improving the oral hygiene capability of patients with fixed orthodontic appliance to manage oral hygiene. Methods. The study was conducted on patients beginning orthodontic therapy with fixed orthodontic appliance in Department of Orthodontics, P University Hospital. We applied the newly designed critical pathway on test group (each twenty male/female patients in their teens and twenties) and regular oral hygiene education on control group (each twenty male/female patients in their teens and twenties) and evaluated their capability of oral hygiene management by plaque index and gingival bleeding index. We also evaluated it by age, gender, and period of attaching orthodontic appliance. Independnet t-test and ANOVA were used for statistical analysis. Results. The plaque indices of the test group were lower than those of the control group one, two, three month after bonding the brackets. There were no significant differences in the gingival bleeding indices between test and control group one, two, three month after bonding the brackets. At one month after bonding the brackets, the plaque indices decreased greatly, but 3 months later, the plaque indices became similar to those before orthodontic treatment. Conclusions. Education of oral hygiene management with critical pathway is more effective than the traditional method for the reduction of dental plaque. Education is necessary every 3 months to maintain the oral hygiene abilities continuously.

Perovskite 전이금속 산화물 Li_(0.33)Sr_(0.34+x)Sc_(x)Nb_(1-x)O₃, Li_(0.33)Sr_(0.34+x-y)Sc_(x)La_(y)Ta_(1-x)O₃의 Lithium 이온전도 특성

송효경,신유주 가톨릭대학교 자연과학연구소 2003 자연과학논문집 Vol.24 No.-

새로운 비양론적 페로브스카이트(perovskite) 전이금속 산화물 Li_(0.33)Sr_(0.34+x)Sc_(x)Nb_(1-x)O₃, Li_(0.33)Sr_(0.34+x-y)Sc_(x)La_(y)Ta_(1-x)O₃을 고체 합성법으로 고온합성 하였다. 이들은 모두 정방형 구조를 갖고 있으며, 조성에 따라 단위세포와 A-자리 공극의 농도 및 공유결합성의 변화를 보여준다. 이들의 이온전도도는 300-770K 영역에서 AC-impedence 측정법으로 측정되었다. 이들이 상온 전도도는 10^(-5)Scm^(-1)정도를 나타내었고, 온도가 증가하면서 10^(-2)Scm^(-1)정도까지 증가하였다. 이러한 전도도의 변화는 화학결합 특성, 공극율 및 단위세포의 크기와 연관지어 이해할 수 있었다. New non-stoichiomtric perovskite oxides Li_(0.33)Sr_(0.34+x)Sc_(x)Nb(1-x)O₃ and Li_(0.33)Sr_(0.34+x-y)Sc_(x)La_(y)-Ta(1-x)O₃ were directly prepared by solid-state thermal reaction. As prepared samples show the simple cubic structure and a small variation of lattice parameter, the vacancy concentraticn and bond character with the composition. The ionic conductivity were determined around 10^(-5) Scm^(-1) near room temperature but increased up to 10^(-2) Scm^(-1) with temperature. The conductivity behavior has been discussed in relation with the variation of chemical bonding, the vacancy concentration and the effective volume of unit-cell of the lattice.

우리나라 國際空港運營의 制度的 改善方案에 關한 硏究

宋孝卿,宋喜鐵 한국항공대학교 1973 論文集 Vol.5 No.-

今日에 있어 空航施設의 整備 및 管理는 航空輸送需要의 급격한 증대와 航空技術革新에의한 高速 大型航空機의 出現, 航空 서어비스의 質的 向上, 高度의 安全性等의 諸般要素에 적응할 수 있는 現代的 規模로 推進되어야 한다. 그러나 今後 問題가 되는 것은 空港整備에 所要되는 投資關係資金의 調達方法과 管理主體에 관한 것이다. 現在 우리나라의 國際空港은 1970年代 航空需要의 급증으로 인하여 이미 그 收容能力이 限界點에 達하고 있으며 東南亞 各國 主要國際空港에 比하여 規模와 施設이 落後되어 있어 國際關門으로서의 面貌와 機能을 刷新하고 觀光客誘致를 적극 支援하며 特히 超大型 Jumbo-Jet 機의 就航에 對備하여, 施設의 改良整備와 그 運營의 合理化를 期하기 위하여서는 그 管理體制에 관하여 改善的인 檢討를 하며 長期的인 眼目下에 施設의 整備計劃과 그 運營을 合理化시키는 方案을 硏究하고 特히 空港의 機能을 확보하기 위하여 필요한 施設, 空港을 利用하는 자의 便利를 확보하기 위하여 필요한 施設 등의 空港施設은 企業的인 運營體制를 확립하여 投資確保를 中心으로 資金調達의 母體가 되는 運營體制를 채택하여야 한다. Airport facilities are to be maintained and operated on the present day hasis adap-table to the various factors such as, rapidly increased demand in air transport, advent of higher performance aircraft, substantial improvement of air service and high state of safety. At present, international airports in Korea are considered to be reached to the limits and they are falled behind the major international airports in south aisan countries in facilities and scale. In order to reform the functions and features of the airport as an international gateway, to support the attraction of foreign tourists to Korea, to rationalize the operations and improved maintenance of airport facilities and specially to provide for the operation of super type Jumgo Jet aircraft, improvemental study of the managial system, organizational planning of the airport facilities and rationalization of the airport operations are necessary on a long range basis. For airport facilities necessary to ensure the airport function and to ensure the facilitation for airport users, operational system as mother's body for obtaining money taking a leading part in investment mush be established.

航空事故調査에 있어 Human Factor에 관한 硏究

宋孝卿 한국항공대학교 1974 論文集 Vol.7 No.-

航空事故에 直接 間接으로 關聯된 人間에 대한 硏究 및 調査는 人間工學的인 接近으로 事故 誘發의 要素를 硏究하여 現在와 未來의 安全度 向上에 ?與하도록 하여야 한다. 특히 關心事는 事故의 原因中 約 70%가 人的要素에 起因한다는 事實을 事故祖査를 分擔하는 범위의 Human factor에 屬하는 點이 航空機의 運航安全對策을 수립하는데 가장 重要한 要素로 되어 있다. 따라서 航空事故의 發生 및 그 再發을 防止하기 위해서는 人的要素面에서 航空事故調査의 思考方式을 硏究하는 것이 航空業務를 擔當하는 人間에 대한 理解를 갖게 될것이며 事故調査의 安全을 期할 수 있게 된다. A Study on the human factor concerned directly or indirectly to the aircraft accident must be contributed to the improvement of the safety for the future by the finding of accident inducement factor applying human engineering. The interested is the fact that 70 percent of the total aircraft accident is caused by the human factor, and it is very important that human factor should be considered as an element in planning of the arrangements for the safe aircraft operation. To prevent aircraft accident and its fecurrence, it is believed that due consideration must be given to the human factor for the the study on the aircraft accident investigation and it will help understanding the human being engaged in air servic and Completting the findings of the cause of the aircraft accidents.

에너지 交通體系의 展望에 관한 硏究 "에너지 節減을 위한"

宋孝卿 한국항공대학교 1975 論文集 Vol.8 No.-

우리나라 石油資原은 그 全量을 海外에 依存하고 있으며 現在까지 에너지 問題에 관한 우리들의 關心은 主로 供給確保에만 集中하여 왔다. 그리고 交通領域에서 에너지를 문제로하는 것은 그 輸送에 限定한 것이고 交通機關의 에너지利用에 대한 그 自體에 관하여는 별로 큰 關心을 갖지않고 있다. 그러나 石油와 같이 國際性이 가장 强한 資原의 需給關係는 우리 나라만의 意思로서 決定할 수 없는것이 確實하다. 이와같이 不安定한 石油에 우리나라의 交通手段의 大部分의 에너지를 依存하고 있음은 가장 不安하며 重要視할 문제인 것이다. 특히 石油價格의 引上은 輸送커스트 昴騰의 要因이 되고 있음을 冷靜히 認識하여야 한다. 따라서 將來 輸送體系로서는 石油에만 衣存하지 않는 새로운 體系의 開發과 또한 새로운 交通體系로 轉換시켜 綜合的인 交通政策을 檢討할 것이 必要하다. 이것은 交通機關의 에너지 使用法 그리고 에너지 節約에 重點을 두고 檢討하여야 한다. 現代의 交通政策은 오직 交通用役의 需要 供給을 원활히 하기위한 經濟性 追求로부터 環境制御에의 對應으로 그 重點을 移動하고 있다는 事實도 고려되어야 한다. 政府는 自然資原의 점차적인 感少와 交通의 混雜이 점점 惡化되어가고 있다는 豫側에서 交通에 대한 哲學을 再檢討하여야 하며 그 方法으로서는 代替할 수 있는 交通體系의 便益을 철저히 硏究하는 것이다. For its demand of oil, Korea depends entirely upon oversea resources, and accordingly our concerns with the problems of energy supply have been concentrated on the questions as to how we could keep the contry provided with the subject item. It is, however, a dismal reality that such energy proqlems so far purwued in the fields of transportation have been confined merly to runing the means of transportation, and that no concern has ever been given to promote an economical utilization of the oil energy therein. I am convinced that an item of international nature like oil can never be made available at our own disposal, and , from this point of view, that an unstable sitnation is inevitable so long as we lack oil requisite for keeping most of the country's means of transportation running. Above all, its should be recognized that the rise of transportation costs has eventally been caused by tjat of oil. It is, therefore, necessary for us to examine th general policies on transportation and to seek a proper way of developing and converting the existing conditions into favorable ones for the prospective systems of transportation, And this attempt must be based upon the feasivility of an economical use of energy applicable to various vehicles. In addition, it is to be taken into consideration the policies pertaining to transportation of the modern world tend to make remarkaqle changes in their shapes....that is, that from the economic pursuit of supply and demand required formtransportational services to b better control of the human environments It is desired that the government, to create a possible substitute form contrinued conveniences in the systems of transportation throuhg a close estimation the current traffic flow is on the gfadual deterioration as well as the gloomy status tjat tje natural resources are baecoming short and hard to procure.