• 대한치과교정학회지
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• 제33권1호
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• pp.41-49
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• 2003

골격성 III급 부정교합자는 부적절한 악골 위치에서 기능 교합을 유지하기 위해 치아의 경사도와 수직적 위치가 변화하게 된다. 이러한 치성보상은 전치부 및 구치부 전반에 걸쳐 일어나며, 현재 보편적으로 시행되고 있는 악교정수술을 위한 술전교정시 이를 제거하여 각 골격 구조내에서 치아들이 적절히 위치되도록 하여야 한다. 전치부 치성보상에 관한 측모 두부방사선 사진을 이용한 연구는 많이 시행되어졌으나, 구치부 경사도에 관한 연구는 미미 한 실정이다. 이에 본 연구는 성인 골격성 III급 부정교합자의 전후방적, 수직적 악골 부조화에 따른 폭경 부조화 및 구치 경사도 변화를 알아보기 위해 진단 모형상에서 상하악 견치, 제1소구치, 제1대구치 부위의 기저골 폭경을 측정하여 상악에 대한 하악의 비율을 구하였으며, 모형 을 삭제하여 좌우 구치간 경사도를 측정하였다. 악골 부조화 심화에 따른 기저골 폭경 비율과 제1대구치 협설 경사도 변화의 상관관계를 조사하여 다음과 같은 결론을 얻었다. 1. 골격성 III급 부정교합자의 악골의 전후방적 부조화가 심화될수록 상하악 구치간 각도합이 증가하여 치성보상이 많이 일어났으며, 특히 하악 구치가 설측 경사되는 치성보상을 보였다(p<0.001). 2. 골격성 III급 부정교합자의 악골의 수직적 부조화 및 폭경 부조화와 구치부 치성보상 간에는 유의할만한 상관성이 없었다. 3. 골격성 III급 부정교합자의 전후방적, 수직적 부조화의 심화와 기저골 폭경 부조화는 유의할만한 상관성이 없었다.

• 대한치과교정학회지
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• 제33권3호
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• pp.141-150
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• 2003

본 연구의 목적은 정상교합자의 전후방 및 수직적인 골격형을 군집분석을 이용하여 분류하고, 자연적인 치아치조부 보상기전으로 정상교합을 이룰 수 있는 골격의 범위와 한계를 파악하여 교정치료와 수술-교정 복합치료의 경계 증례에서 진단과 치료 계획 수립에 도움이 되고자 하는 것이다. 이를 위하여 대단위 구강 검진 중 15,836명으로부터 선발된 정상교합자 중 검사에 응한 294명의 측모 두부계측방사선사진의 투사도를 작성하여 계측하고, 인자분석을 통하여 18개의 골격계측항목 중에서 전후방적 골격 관계를 나타내는 인자와 수직적 골격 관계를 나타내는 인자를 추출하였으며, 이를 군집분석에 적용하여 정상교합자의 골격형을 9개의 군으로 분류할 수 있었다. 본문에서는 각 군의 전후방적, 수직적 골격계측 항목의 평균 및 표준편차를 구하고, 각 군 간의 차이를 비교 분석한 결과를 제시하고 있으며, 이를 통하여 정상교합자의 전후방적, 수직적 악골 관계가 매우 다양함을 알 수 있었다.

• Anatomy and Cell Biology
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• 제55권4호
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• pp.433-440
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• 2022

This study aimed to investigate the general mandibular symphysis (MS) shape variation among Class III skeletal base, using geometric morphometric analysis. Pre-treatment lateral cephalometric radiographs of 254 patients aged 11-40 years old, with Class III skeletal base (ANB <1°) and lower incisor angle (<99°) were included. Nine-landmarks with x and y coordinates were identified on MS using TPSDig2 software, then exported into Morpho J for shape and statistical analysis. Principal component analysis showed that three main shape dimensions with a total variance of 74.6% represented the majority variation of samples. Procrustes Anova showed the shape of MS in Class III skeletal base to be mainly influenced by gonial angle, incisor inclination and sex (P<0.0001). Canonical variate analysis showed that high gonial angle groups had significantly narrower and elongated MS whereas low gonial angle groups had wider, bulbous and rounded MS (P<0.0001). The ratio of alveolar part to basal part was 1:5 in low gonial angle and 2:3 in high gonial angle. Males had significantly taller MS with narrower B point area compared to females (P<0.0001). Retroclined incisors exhibited taller and retroclined alveolar parts (P<0.0001). The shape of MS in Class III skeletal base varied at the alveolar part, basal part or both and it is influenced by gonial angle, incisor inclination and sex. Hence, understanding the shape variation of MS is important to aid orthodontic treatment planning.

• 대한예방한의학회지
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• 제12권3호
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• pp.35-45
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• 2008

Purpose : To evaluate safety of Sibjeondaebotang and Yugmijihwangtang in rats' fetus Methods : Female Sprague-Dawley rats were orally administered with the Sibjeondaebotang and Yugmijihwangtang at dose of 5mg/kg/day for 20 days. Pregnant rats were sacrificed at 20th day of gestation. Approximately live fetuses in the 20th day of gestation were randomly selected and fixed in 95% ethanol. To observe skeletal malformations, fetuses were stained with alcian blue and alizarin red S. Results : Neonatal body weight and number of fetus of Sibjeondaebotang, Yugmijihwangtang group were increased to those of control group. The fetuses treated with Sibjeondaebotang, Yugmijihwangtang didn't showed external malformation. Vertebral and sternal skeletal variations were observed in Sibjeondaebotang, Yugmijihwangtang administered group, but compared to the control, those skeletal variations were insignificant. There were no significant changes in number of ribs, cervical, thoracic, lumbar, sacral and caudal vertebrae Conclusion : From these results, it can be concluded that Sibjeondaebotang, Yugmijihwangtang shows no toxicity effects on fetus body weight and number of live fetuses. Although skeletal variations were shown in vertebrate and sternum, Sibjeondaebotang, Yugmijihwangtang did not show significant changes in bone malformation.

• 대한치과교정학회지
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• 제8권1호
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• pp.27-37
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• 1978

In order to know the variation of the associated craniofacial skeletal angle and linear distance according to the change of gonial angle, the roentgenographic cephalo metric study was undertaken in Korean normal cephalometric analysis and eletric computer. The fallowing results were optained. 1) The size of gonial angle is mainly depend on the lower gonial angle. The mean of upper gonial gngle is almost same in normal occlusion group$^*$ and malocclusion group. 2) It was resulted on normal group and malocclusion group by F test that the number of parameters that were significant at 5% level of confidence were 14 parameters in normal occlusion group and 22 parameters in malocclusion group. 3) Ramus height and mandibular body length increased and facial ratio is decreased as gonial angle decreased. 4) MP-T, overbite depth and Y-axis angle is not related to gonial angle in normal occlusion group, but in moloclusion group, as gonial angle decreased, MP-T and overbite depth is increased and Y-axis angle is decreased. 5) SN-MP, OP-MP, PP-MP is increased as gonial anglel increased, it was mainly depend on the lower gonial angle.

• 대한예방한의학회지
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• 제14권3호
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• pp.1-12
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• 2010

Objective : Samulatang (herbal description) is much used for women's disease in Korean Traditional Medicine. The aim of this study is to evaluate reproductive toxic effect by Samultang in pregnant rats and fetuses, and ascertain a dose-response relationship Method : Pregnant Sprague-Dawley rats were administered with the Samultang at single, double and quadruple dose for 20 days, orally. Pregnant rats were sacrificed at 20th day of gestation, and observed internal and reproductive organs. Live fetuses of gestation were randomly selected and fixed in 95% ethanol. Fetuses were stained with alcian blue and alizarin red S. We observe maternal body weight,, index associated pregnancy, and skeletal malformations in fetus Result : Maternal body weight of Samultang treated group has increased, side effect was not found in maternal body compared to that of control group. There were no significant difference in internal and reproductive organs. Double concentration administered group had lowest value in number of implantation, live fetuses, implantation rate and delivery rate, Also double concentration administered group showed higher early and late resorption rate than the other group. But, these are not significant. In the sex ratio, number of females, bigger than number of males in all Samultang administered groups. The fetuses of dams treated with Samultang didn't showed external and skeletal malformation. Vertebral and sternal variations were observed in single, double and quadruple concentration administered group but, compared to the control, those variations were insignificant. There were no significant changes in number of ribs, cervical, thoracic, lumber, sacral and caudal vertebrae Conclusion : Samultang is not expected to affect on pregnant rats and fetus about maternal body weight and number of live fetuses. There were no significant changes in organ weight, reproductive organs. Although skeletal variations were showed in vertebrae and sternum, treated groups were shown insignificant changes in skeletal variation

• 대한예방한의학회지
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• 제12권2호
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• pp.27-35
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• 2008

Purpose : The experiments was undertaken to evaluate the effects of Ojeoksan-herbal medicine, in rats' fetus Methods : Female Sprague-Dawley rats were orally administered with the Ojeoksan at dose of 5mg/kg/day for 20 days. Pregnant rats were sacrificed at 20th day of gestation, and observed internal and reproductive organs. Approximately live fetuses in the 20th day of gestation were randomly selected and fixed in 95% ethanol. Results : Neonatal body weight and number of fetus of Ojeoksan group were increased to that of control group. The fetuses of dams treated with Ojeoksan didn't showed external malformation. Vertebral and sternal skeletal variations were observed in Ojeoksan administered group, but compared to the control, those skeletal variations were insignificant. There were no significant changes in number of ribs, cervical, thoracic, lumber, sacral and caudal Conclusion : From these results, it can be concluded that Ojeoksan showed no toxicity effects on number of live fetuses. There were no significant changes in skeletal variations were showed in vertebrate and sternum, Ojeoksan weren't shown significant changes in bone malformation. We need more precise study to investigate the mechanism of early or late resorption by the herbal medicines such as Ojeoksan.

• 한국수산과학회지
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• 제5권2호
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• pp.57-62
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• 1972

잉어의 배육 골격근에서 actomyosin을 추출하여 몇 가지 생물물리화학적인 성질을 측정 검토한 결과는 다음과 같다. 즉, actamyosin의 침강 정수($s_{20},\;_\omega$)는 24.76s이고 그 점성은 단백 농도의 증가와 더불어 급상승하여 다른 actomyosin의 그것과 비숫한 경향을 보였다. 그리고, ATP-sensitivity는 $147\~176$이었고, PH영향하에서 ATPase activity는 산성측이 6,0부근, 알칼리성측이 9.5부근이었으므로 ATPase activating site가 산, 알칼리 양측에 있음을 알았다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2017년도 춘계학술대회
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• pp.510-511
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• 2017

본 논문에서는 척추 관련 질환을 예방하고, 잘못된 자세를 사용자에게 피드백하여 자세교정에 도움을 주기 위한 연구를 수행하였다. 이를 위해 키넥트 센서를 사용하였으며, 사용자의 움직임을 측정하기 위해 골격 데이터 좌표 값을 인덱스 화하여 움직임 변화정도를 측정하였다. 구현된 시스템은 자세판별 뿐만 아니라 사용자의 산만도 모니터링이 가능함을 확인하였다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2000년도 춘계학술대회논문집A
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• pp.261-267
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• 2000

A mathematical model was developed to calculate the muscle force of lower extremity during the gait. We constructed a model of human locomotion, which includes a muscle-skeletal system with 7 segments and 16 lower limb muscles. Using a optimization technique, muscle forces variation of the lower extremity during the gait were generated and its result was verified by comparing a experimental results of EMG analysis. Moreover. the walking movement of the model could be compared quantitatively with those of experimental studies in human by inverse dynamics.