Correlation between skeletal and dental changes after mandibular setback surgery-first orthodontic treatment

Chang-Hoon Rhee,Youn-Kyung Choi,Yong-Il Kim,Seong-Sik Kim,Soo-Byung Park,Woo-Sung Son 대한치과교정학회 2015 대한치과교정학회지 Vol.45 No.2

Objective: To investigate skeletal and dental changes after application of a mandibular setback surgery-first orthodontic treatment approach in cases of skeletal Class III malocclusion. Methods: A retrospective study of 34 patients (23 men, 11 women; mean age, 26.2 ± 6.6 years) with skeletal Class III deformities, who underwent surgery-first orthodontic treatment, was conducted. Skeletal landmarks in the maxilla and mandible at three time points, pre-treatment (T0), immediate-postoperative (T1), and post-treatment (T2), were analyzed using cone-beam computed tomography (CBCT)-generated half-cephalograms. Results: The significant T0 to T1 mandibular changes occurred ?9.24 ± 3.97 mm horizontally. From T1 to T2, the mandible tended to move forward 1.22 ± 2.02 mm, while the condylar position (Cd to Po-perpendicular plane) shifted backward, and the coronoid process (Cp to FH plane) moved vertically. Between T1 and T2, the vertical dimension changed significantly (p < 0.05). Changes in the vertical dimension were significantly correlated to T1 to T2 changes in the Cd to Po-perpendicular plane (r = ?0.671, p = 0.034), and in the Cp to FH plane (r = 0.733, p = 0.016), as well as to T0 to T1 changes in the Cp to Poperpendicular plane (r = 0.758, p = 0.011). Conclusions: Greater alterations in the vertical dimension caused larger post-treatment (T2) stage skeletal changes. Studying the mandibular position in relation to the post-surgical vertical dimension emphasized the integral importance of vertical dimension control and proximal segment management to the success of surgery-first orthodontic treatment.

Effects of one or two applications of all-in-one adhesive on microtensile bond strength to unground enamel

Son, Chang-Yong,Kim, Hyeon-Cheol,Jur, Bock,Park, Jeong-Kil 대한치과보존학회 2006 Restorative Dentistry & Endodontics Vol.31 No.6

이 연구에서는 미세인장결합강도 실험과 주사전자현미경을 이용하여 unground enamel에 대한 all-in-one adhesive의 1회 또는 2회 적용에 따른 효과를 평가하였다. 발거된 하악 대구치의 설측 치관부를 사용하여 3개씩 5개의 군으로 분류하였다. SE군은 Clearfil™ SE Bond를 적용하였다. LP1 군, LP2 군은 Adper Prompt L-Pop™을 각각 1회 , 2회 적용하였다. XN1 군, XN2 군은 Xeno^(®) Ⅲ를 각각 )회, 2회 적용하였다. 그런 다음 복합 레진 Z100을 적층 충전하였다. 법랑질 표면의 접착제를 아세톤으로 제거하고 주사 전자 현미경을 이용하여 산 부식 양상을 관찰하였다. 미세인장결합강도 측정을 위해 표본을 절단하여 레진과 치아의 접착 계면이 1 ㎟이 되도록 하여 실험하였다. 실험의 결과는 One-way ANOVA를 사용해 분석한 다음 Duncan's post-hoc test로 사후 검정 하였다. 본 연구의결과 a11-in-one adhesive의 1회와 2회 적용간에는 유의한 차이가 나타나지 않았으며 two-step self-etching adhesive와 a11-in-one adhesive의 산 부식 양상 모두 얕고 불규칙 하였다. The purposes of this study were to compare the effects of one or two applications of all-in-ne adhesives on microtensile bond strengths (TBS) to unground enamel and to investigate the morphological changes in enamel surfaces treated with these adhesives using a scanning electron microscopy (SEM). Twenty-five noncarious, unrestored human mandibular molars were used. The unground enamel surfaces were cleansed with pumice. The following adhesives were applied to lingual, mid-coronal surfaces according to manufacture's directions; Clearfil SE bond in SE group, Adper Prompt L-Pop™1 coat in LP1 group, 2 coats in LP2 group, Xeno^(®) Ⅲ1 coat in XN1 group, and 2 coats in XN2 group. After application of the adhesives, a hybrid light-activated resin composite was built up on the unground enamel. Each tooth was sectioned to make a cross-sectional area of approximately 1.0 ㎟ for each stick. The microtensile bond strength was determined. Each specimen was observed under SEM to examine the morphological changes. Data were analyzed with one-way ANOVA. The results of this study were as follows; 1. The microtensile bond strength values were; SE (19.77 ± 2.44 MPa), LP1 (13.88 ± 3.67 MPa), LP2 (14.50 ± 2.52 MPa), XN1 (14.42 ± 2.51 MPa) and XN2 (15.28 ±2.79 MPa). SE was significantly higher than the other groups in bond strength (p < 0.05). All groups except SE were not significantly different in bond strength (p < 0.05). 2. All groups were characterized as shallow and irregular etching patterns.

온도변화에 따른 파이버 브래그 격자 필터의 특성에 관한 연구

손용환(Yong-Hwan Son),이종윤(Jong-Youn Lee),허주옥(Ju-ok Huh),배창환(Chang-Hwan Bae),정진호(Jin-Ho Jung) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11

In this paper, we present thermal characteristics of a fiber Bragg grating(FBG) filter, including peak reflectivity and FWHM bandwidth by various refractive index change. The reflection spectrum of a FBG filter with refractive index change is affected by its thermal stability.

정신분열병에 대한 리스페리돈의 효과 및 안정성

이민수,김용구,김영훈,연병길,오병훈,윤도준,윤진상,이철,정희연,강병조,김광수,김동언,김명정,김상훈,김희철,나철,노승호,민경준,박기창,박두병,백기청,백인호,손봉기,손진욱,양병환,양창국,우행원,이정호,이종범,이홍식,임기영,전태연,정영조,정영철,정인과,정인원,지익성,채정호,한상익,한선호,한진희,서광윤 大韓神經精神醫學會 1998 신경정신의학 Vol.37 No.1

연구목적 : 본 시험의 목적은 임상시험 시작전에 연구자들을 대상으로 PANSS Workshop을 통하여 PANSS, ESRS에 대한 국내에서의 표준화 작업을 구축하고 새로운 정신병 치료제인 리스페리돈의 효과와 안정성을 재확인하여 리스페리돈 사용에 대한 적정화를 이루는데 있다. 연구방법 : 1996년 4월부터 1996년 9월까지 국내 39개 대학병원 정신과에 입원중인 혹은 증상이 악화되어 입원하는 정신분열병 환자 377명을 대상으로 다시설 개방 연구를 시행하였다. 1주일간의 약물 배설기간을 가진후, 리스페리돈을 8주간 투여하였고, 기준점, 1주, 2주, 4주, 그리고 8주후에 평가되었다. 용량은 제1일에는 리스페리돈 1mg씩 1일 2회, 제2일에는 2mg씩 1일 2회, 제3∼7일에는 3mg씩 1일 2회 투여하였다. 이후 환자의 임상상태에 따라 임의로 증량할 수 있으며, 최대 일일 16mg을 초과하지 않도록 하였다. 추체외로 증상을 조절하기 위한 투약을 허용하였다. 임상증상 및 부작용의 평가는 PANSS(Positive and Negative Syndrome Scale), CGI(Clinical Global Impression) 그리고 ESRS(Extrapyramidal Symptom Rating Scale)을 사용하였다. 연구결과 : 377명중 343명(91%)이 8주간의 연구를 완결하였다. 치료 종결시점인 8주후 PANSS 총점수가 20% 이상 호전된 경우를 약물 반응군으로 정의할때, 약물반응군은 81.3%였다. 리스페리돈에 반응하는 예측인자로는 발병연령, 이전의 입원 횟수, 유병기간이 관련 있었다. 리스페리돈은 1주후부터 PANSS양성, 음성, 및 일반정신병리 점수상에 유의한 호전을 보여 효과가 빨랐다. CGI의 경우도 기준점에 비해 1주후부터 유의한 감소를 나타내었다. ESRS의 경우, 파킨슨 평가점수는 기준점과 비교해 투여 1주, 2주, 4주후 유의하게 증가되었다가 8주후 기준점과 차이가 없었다. Dystonia 평가점수는 1주후만 유의한 증가를 보였으며, dyskinesia 평가점수는 유의한 차이가 없었다. 혈압, 맥박수의 생명징후 및 일반 혈액학 검사, 생화학적 검사, 심전도 검사에서 유의한 변화는 없었다. 결 론 : 이상의 다시설 개방 임상 연구를 통해 리스페리돈은 정신분열병 환자에서 양성증상뿐만 아니라 음성증상 및 전반적인 증상에도 효과적인 것으로 사료된다. 보다 명확한 평가를 위해서는 다른 항정신병약물과의 이중맹검 연구가 필요할 것으로 생각되며, 또한 장기적 치료에 대한 평가도 함께 이루어져야 하겠다. Objective : The purpose of this study was to investigate the efficacy and safety of risperidone in the treatment of Korean schizophrenic patients. Method : This multicenter open study included 377 schizophrenic patients drawn from 39 university hospitals. After a wash-out period of 1 week, the schizophrenic patients were treated with risperidone for 8 weeks and evaluated at 5 points ; at baseline, and 1, 2, 4 and 8 weeks of treatment. The dose was increased from 2mg/day(1mg twice daily) to 6mg/day(3mg twice daily) during the first week and adjusted to a maximum of 16mg/day over the next 7 weeks according to the patient's clinical response. Medication to control extrapyramidal symptoms was permitted. The psychiatric and neurological status of the patients was assessed by PANSS, CGI, and ESRS scales. Results : 343(91%) of 377 patients completed the 8-week trial period. Clinical improvement, as defined by a 20% or more reduction in total PANSS score at end point, was shown by 81.3% of patients. The predictors of response to risperidone were associated older age, shorter duration of illness, fewer previous hospitalization. Risperidone had rapid onset of action ; a significant decrease of the total PANSS and three PANSS factor(positive, negative, general), and CGI was already noticed at the end of first week. For the ESRS, parkinsonism rating scores were significantly increased until week 4 comparing with baseline. Dystonia rating scores were significantly increased until week 1, and dyskinesia rating scores were not significantly changed during the study. Laboratory parameters including vital sign, EKG, hematological, and biochemical values showed no significant changes during the trial. Conclusions : This study suggests that risperidone is generally safe and effective against both the positive and negative symptoms in our group of patients.

Splitter 급전 2소자 원편파 사각 패치 배열안테나의 설계

손태호,강상규,이병수,이용창,백경훈 순천향대학교 부설 산업기술연구소 2001 순천향 산업기술연구소논문집 Vol.7 No.2

Dual-fed circulary polarized microstrip 1 by 2 array antenna is designed and fabricated. To have circular polarization, we applied power splitter with 90 degree phase shifter by the length exetension. A 1 by 2 uniformed array antenna was designed and measured, and compared with theoretical values. The bandwidth characteristic is well coincided with the designed valued, but the center frequency for the GPS 1.575GHz differed sligthly by the reason of the substrate tolerance.

2개 기생소자에 의한 사각형 패치 안테나의 대역폭 확장

손태호,강상규,이병수,이용창,백경훈 순천향대학교 부설 산업기술연구소 2001 순천향 산업기술연구소논문집 Vol.7 No.2

This study is to extend bandwith for the microstrip antenna by parasitic patch devices. Applying two 1/4 wave length parasitic patches both side of microstrip patch, the bandwidth is able to be controlled by the parasitic couplings. We used the Tschebyscheff transformer for multisection matching network to give broadband transformation. It is designed for wireless MMDS CATV antenna and design antenna is fabricated by epoxy substrate of 1.2mm thickness, 4.4 relative permittivity. The theory is well agreed that the results of measurement of S11 has 2.88% band characteristic.

코너 리플렉터 안테나의 복사특성 해석

손태호,이용창 순천향대학교 부설 산업기술연구소 1998 순천향 산업기술연구소논문집 Vol.4 No.1

It is analyzed dipole feeding corner reflector antenna which operates on 860MHz center frequency by the image method of geometrical optics. Formula of radiated field and directive gain are presented by function of distance between reflector apex and feeding dipole. For 90 degree corner reflector antenna, radiation pattern are simulated and compared with measured pattern, and measured gain 9.86dBi agree well with theoretical gain 10.64dBi.

오스테나이트계 스테인리스강의 진동감쇠능에 미치는 ε 마르텐사이트의 영향

손동욱,김재환,김익수,Miyahara Kazuya,성장현,강창룡 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.8

The effect of the phases of y, α' and ε martensites, which constitute the structure of the 316L stainless steel with austenite structure at room temperature, on the damping capacity at room temperature has been investigated. As a result, various fractions of these phases were formed depending on the degree of cold work. The largest volume fraction of a martensite phase is obtained by 20% cold rolling and showed the highest damping capacity. The damping capacity is strongly controlled by the volume fraction of ε martensite with linear relationship, while the other phases of α' and r have actually no effect on the damping capacity.

쥐 태아 간에서 간 세포 발육에 관한 전자현미경적 연구

손용진,김경용,이원복,김동창 중앙대학교 의과대학 의과학연구소 1989 中央醫大誌 Vol.14 No.3

The development of fetal rat liver between 12 and 21 days of gestation was studied ultrastructurally. The liver developed closely associated with hemopoiesis, and so, the ultrastructural changes of hepatocytes according to hemopoietic activity were investigated. The results observed were as follows. 1. The hepatocytes were discernible as dark cells of high electron density due to many ribosomes, rough endoplasmic reticulums and lipid inclusions, and as light cells of low electron density due to relatively small amount of such organelles. 2. At 13 day of gestation, hepatocytes with many granules were frequently found and had well developed Golgi apparati, dilatated granular endoplasmic reticulums. The granules were round in shape, surrounded by membrane, and observed with high inner, low outer electron densities. These characteristics reflected the capacity to produce proteineous substances and the maturity, and in general, hepatocytes at 13 day of gestation were more mature than at 12 day. 3. The hepatocytes were irregular in shape due to many hemopoietic cells after 14 day of gestation and made microvilli in close contact with hemopoietic cells. Hepatocytes showed well developed Golgi apparati, RERs, mitochondria and many ribosomes, and at 17 day of gestation, immature bile canaliculi were present. In summary, the great ultrastructural differences of hepatocytes between 12 and 13 day of gestation were the appearance of Golgi apparati, dilatated RERS, many ribosomes, granules and lipid inclusions reflecting the capacity to produce proteineous substances. Besides the above, hemopoietic cells appeared for the first time at 13 day of gestation and hepatocytes were in close contact with hemopoietic cells. From the results, the hepatocytes are supposed to produce some proteineous substances affecting the hemopoiesis.

한국인 직무 스트레스 측정도구의 개발 및 표준화

장세진,고상백,강동묵,김성아,강명근,이철갑,정진주,조정진,손미아,채창호,김정원,김정일,김형수,노상철,박재범,우종민,김수영,김정연,하미나,박정선,이경용,김형렬,공정옥,김인아,김정수,박준호,현숙정,손동국 大韓産業醫學會 2005 대한직업환경의학회지 Vol.17 No.4

Background and Purposes: Over the past three decades, numerous studies performed in Korea have reported that job stress is a determinant risk factor for chronic diseases and work disability. Every society has its own culture and occupational climate particular to their organizations, and hence experiences different occupational stress. An occupational stress measurement tool therefore needs to be developed to estimate it objectively. The purpose of this study is to develop and standardize the Korean Occupational Stress Scale (KOSS) which is considered to be unique and specific occupational stressors in Korean employees. Subjects and Methods: Data were obtained from the National Study for Development and Standardization of Occupational Stress (NSDSOS Project: 2002-2004). A total of 12,631 employees from a nationwide sample proportional to the Korean Standard Industrial Classification and the Korean Standard Occupational Classification were administered. The KOSS was developed for 2 years (2002-2004). In the first year, we collected 255 items from the most popular job stress measurement tools such as JCQ, ERI, NIOSH and OSI, and 44 items derived from the a qualitative study (depth interview). Forty-three items of KOSS, in the second year, were retained for use in the final version of the KOSS by using Delphi and factor analysis. Items were scored using conventional 1-2-3-4 Likert scores for the response categories. Results: We developed eight subscales by using factor analysis and validation process: physical environment (3 items), job demand (8 items), insufficient job control (5 items), interpersonal conflict (4 items), job insecurity (6 items), organizational system (7 items), lack of reward (6 items), and occupational climate (4 items). Together they explained 50.0% of total variance. Internal consistency alpha scores were ranged from 0.51 to 0.82. Twenty-four items of the short form of the KOSS (KOSS-SF) were also developed to estimate job stress in the work setting. Because the levels of the subscales of occupational stress were gender dependent, gender-specific standard norms for both the 43-item full version and the 24-item short form using a quartile for the subscales of KOSS were presented. Conclusion: The results of this study suggest that KOSS might be an appropriate measurement scale to estimate occupational stress of Korean employees. Further and more detailed study needs to be conducted to improve the validity of this scale.