• 대한치과교정학회지
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• 제24권2호
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• pp.247-273
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• 1994

The purpose of this study was to evaluate the dental arch morphology and the occlusal characteristics in the Koreans from the dental-anthropological point of view. The sample consisted of dental stone casts obtained from 120 Korean adults and 142 Japanese adults. Japanese casts and Caucasian data had been preserved at the Dept, of Orthodontics of Tokyo Medical and Dental University. Tooth size and dental arch morphology of the Koreans were compared with that of the Japanese. On the other hand, the variations of 30 crown traits, categorized and quantitatively graded, were compared between two peoples and the frequency distribution of each crown traits were analyzed by means of Chi-square test. The results were summerized as followings ; 1. There was a significant sexual difference in dental arch length and width in the Korean, in which male had a longer and wider dental arch than female. There was a close resemblance for dental arch morphology between the Koreans and the Japanese, except for a little longer mandibular arch of the Japanese. 2. In general, Korean male had wider crown than female, particulary in central incisor,canine,1st molar of maxilla and canine, 1st and 2nd molar of mandible with significance. The Korean had wider maxillary first molar, smaller mandibular first and second molar than the Japanese in both sex. 3. In crown traits of the Korean, shovel-shaped incisor showed lower frequency distribution than in the Japanese, but higher than in the Caucasians. Frequency of incisor reduction was shown higher distribution than in the Japanese and the Caucasians. Carabelli's tubercle showed higher frequency distribution than in Japanese, but remarkably lower than in Caucasians.

• 대한치과교정학회지
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• 제38권4호
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• pp.283-298
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• 2008

본 연구는 악교정수술을 받은 골격성 III급 부정교합자의 치료 전, 후의 하악치열궁 변화를 관찰하고, 이들이 초진 시의 측모두부방사선 규격사진 및 석고모형과 어떠한 상관성을 가지고 있는지를 알아보기 위해 골격성 III급 부정교합자로 진단받은 31명(남자 14명, 여자 17명, 평균 $21.8\;{\pm}\;3.3$세)을 대상으로 치료 전, 악교정수술 전, 악교정수술 후 채득한 측모두부방사선 규격사진과 치료 전, 후의 석고모형을 계측하여 상관분석과 회귀분석을 시행하였다. 연구 결과 Mn-LMMC, Mn-LIE, Mn-MnOcc는 술전교정치료에 의한 유의한 차이를 보이지 않았다. 치료 전의 계측치와 치료 후 변화된 계측치와의 상관관계에서는 치열궁공간부족(ALD)은 ICW, IPW1의 변화량과 순상관관계(r = 0.492, 0.615)를 보였으며, 치열궁장경(arch length)의 변화량과도 순상관관계(r = 0.641)를 보였다. 그러나 Spee 만곡은 전치부치축 각도 변화와 치열궁 폭경 및 장경 등 각각의 변화량과는 상관관계를 보이지 않았다. 이를 이용하여 회귀분석을 시행한 결과, 술전교정 후 Arch length, IPW1의 변화량은 치료 전의 계측치로 각각 64.0%, 75.8%를 설명할 수 있었다. 이상의 연구에서 골격성 III급 부정교합자의 치료 전, 후의 변화량과 치료 전 측모두부방사선 규격사진 및 석고모형 간에 관련성이 있었고 악교정수술을 동반한 교정치료 계획을 수립할 때 술전교정치료의 목표 설정과 악교정수술 결과의 예측에 도움이 될 것으로 판단된다.

• 한국터널지하공간학회 논문집
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• 제16권3호
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• pp.299-310
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• 2014

국가적으로 국토의 효율적 활용과 친환경성 등으로 인해 터널과 같은 지하공간 건설이 필요하다. 친환경적 요소의 중요성을 감안할 때, 산악지에 형성되는 도로건설에 대해 2-아치 및 대단면 터널로 계획되나 경제성, 시공성, 공사기간, 유지관리 등의 문제점을 가지고 있다. 따라서 본 연구에서는 2차로의 국도터널을 기준으로 현장조건과 지반조건을 고려하여 터널별 이격거리와 토피고를 변화시켜 경험식과 수치해석적으로 필라부의 안전성을 평가하였으며, 해석 프로그램으로 유한요소법을 적용한 Plaxis 2D를 활용하여 터널의 최소 필라폭 선정과 전체적인 터널의 거동특성을 분석하였다. 분석결과, Tie-Bolt에 의한 필라보강은 연직하중을 분산시켜 안전적인 근접병렬터널 계획이 가능하며, 터널 필라의 거동은 현장계측 결과와 잘 일치하는 것으로 나타났으며, 지반조건에 따라 터널 필라폭을 축소시킨다면 이전의 터널에 비해 효율적인 터널 활용이 가능하다.

• 대한물리의학회지
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• 제16권4호
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• pp.139-151
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• 2021

PURPOSE: This study examined the effects of wall-squat with short-foot exercise on pain, dysfunction, and pelvic alignment in chronic low back pain patients. METHODS: Thirty outpatients diagnosed with chronic low back pain and pronated foot were enrolled in this study. The patients were divided randomly into a wall-squat with short-foot exercise group (WS; n = 15) and a normal wall-squat exercise group (NW; n = 15). These groups performed their respective exercises 15 times, for three sets, three times a week over six weeks. The visual analogue scale (VAS) was used to measure the subjects' pain, and the Roland-Morris disability questionnaire (RMDQ) was used to measure the subjects' dysfunction. A navicular drop test (NDT) was used to measure the subjects' arch height. To assess the patients' pelvic alignment, their lordosis, sacral tilt, lumbar width, sacral width, ilium length, and ilium width were measured by X-ray imaging. RESULTS: Both the WS and NW groups exhibited significant decreases in their VAS and RMDQ scores after exercise (p < .05). The WS group exhibited significant increases in their arch height (p < .05). Significant differences in the VAS, sacral tilt, sacral width, and ilium length were observed between the WS and NW groups (p < .05). CONCLUSION: These results suggest that wall-squat exercise is effective in decreasing the level of pain and dysfunction in chronic low back pain patients. In addition, the wall-squat with short-foot exercise is considered more effective in improving the pelvic alignment than without short-foot exercise. This can be an effective method for the non-pharmacological and non-surgical treatment of chronic low back pain

• 치과방사선
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• 제4권1호
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• pp.11-20
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• 1974

The author conducted an experiment using P-A Cephalography of 242 male and female subjects of ages ranging 2-6, 7-15, and adult group. By means of Nakago's method of measurement, the standard value of Korean was obtained. The results were as follows; 1. In the group of an age, the male value was greater slightly than female value. 2. In each age group the difference between the right and left widths could be recognizable, however, it was not much great. 3. In each group, regardless of sex, the growth relation was clearly distinguishable at PO, ARI, ARE, MG, AG, and CAW. 4. When the standard value of adult Korean was compared with that of Japanese, Japanese was great with respect to the width of maxillary portion and Korean was great with respect to the width of mandibular portion. 5. Maximum head width of white man was almost similar to that of Korean, however, maxillary alveolar base width of white man was considerably small or the dental arch was narrow.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2004년도 추계 학술발표회 제16권2호
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• pp.413-416
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• 2004

This paper describes a proposal for crack width and deflection in RC flexural members. Because the serviceability provisions of the current codes are mainly based on only empirical relationships developed from test result and effective moment of inertia, crack width and deflections are contrary to the actual values. Based on nonlinear bond characteristics, tension stiffening effect, arch action and effective concrete tensile area. Then an equation is developed for predicting crack width and deflection in flexural members. The predicted results shows that as proposed model employed, crack width and deflections are different from estimated by the current KCI, MC 90 and EC 2 provisons, and the values predicted are in good agreement with experimentally measured values.

• 대한구순구개열학회지
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• 제2권1_2호
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• pp.5-14
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• 1999

The aim of treatment of cleft lip and palate is to correct the cleft and associated problems surgically and thus hide the anomaly so that patients can lead normal lives. This correction involves surgically producing a face that does not attract attention, a vocal apparatus that permits intelligible speech, and a dentition that allows optimal function and esthetics. In neonatal periods, gross distortion of tissues surrounding the cleft requires considerable effort and time due to post operative functional defect and scarring and induces milk feeding problem, malocclusion of deciduous or permanent dentition, congenital missing teeth, skeletal dysplasia. The occurrence of a cleft deformity is a source of considerable shock to the parents of an afflicted baby, and the most appropriate approach is very important things. Thus we tried to analysis of dental arch, shape and size of deformity in cleft patients. The results were obtained as follows. 1. When the cast measurements of UCLP subjects at first visit it was found that the mean length was 9.29mm at the alveolar cleft width, also that was 11.7mm at the anterior width and 14mm at the posterior cleft width. 2. Comparison of UCLP group at first visit and just lip surgery, it was found that the older group showed a insignificant reduction in the width of the cleft in the alveolar, canine, and tuberosity regions. 3. The maxillary casts of the UCLP group at 6 months differ Significantly from those of the at 3 months in both length and width. but there was no statistical difference except anterior ridge length of nonclefted site. 4. Comparison at 6 months and 18 months, there was a greater change in length of the alveolar cleft width, intercanine width, and anterior cleft width. Maxillary arch became wider at both the canine region and intertuberosity region. also posterior anteroposterior length was increased but anterior AP length was decreased from 8.1mm to 7.7mm. There was meaningful increase at intertuberosity length; however, a significant reduction in width t-t'

• 대한치과교정학회지
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• 제26권6호
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• pp.647-655
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• 1996

In discussing the effects of adenoids on the development of the face and dentition, it is important to note their influence on the mode of breathing and to relate this to specific facial types and dentition. This study, therefore, assumed that the ability to adapt to individual's neuromuscular complex is various. And tried to investigate the effects of reduced nasal respiratory function on the development of dentition by facial type. This paper is based on children patients with enlarged adenoids and comparing them to data taken from a control group with normal respiratory function. Among the three facial types, the most statistical significant difference was observed from dolichofacial type between experimental and control group. In dolichofacial type, the experimental group showed labioversion of upper incisor, decrease in the width of upper arch, increase in overjet, increase in the rate of cross-bite, and increase in the height of palatal vault. No significant difference was observed between the two groups in the inclination of upper and lower incisors in mesofacial type, but the experimental group was observed to show decrease in the width of upper arch and increase in the height of palatal vault. On the other hand, in brachyfacial type, no significant difference was observed between the two groups in dentition variables except showing linguoversion of upper incisor. The results, which were observed in dolichofacial type, consist with Nordlund's theory of Compression.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제38권
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• pp.28.1-28.6
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• 2016

Backgrounds: Insufficient intermaxillary space is caused by non-restoration following tooth extraction in the past, and this involves eruption of the opposing teeth and changes of the arch structure. Such cases are difficult just by a simple prosthetic approach, and diversified treatment plans should be established. Among these, posterior maxillary segmental osteotomy (PMSO) is an efficient treatment option than extraction of opposing teeth as it surgically repositions multiple erupted teeth and alveolar bone. PMSO can preserve the natural teeth; therefore, it is being regarded as a treatment method which can improve insufficient intermaxillary space significantly. Case presentation: In this case report, the first patient received PMSO in order to place an implant in the mandibular edentulous space after decreased vertical dimension is restored, and the second patient received PMSO along with orthodontic treatment to obtain the intermaxillary space and balance the interarch molar width. Conclusion: PMSO is the treatment of choice when occlusion is compromised in the presence of decreased vertical dimension or arch length discrepancy.

• 대한치과교정학회지
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• 제26권5호
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• pp.535-546
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• 1996

이 연구는 한국인 하악치열궁 형태를 분류하고, 교두정에서 브라켓 높이의 협면점까지 거리를 계측하여 이상적인 호선 제작에 도움을 얻기위하여 시행되였다. 13세에서 25세사이의 정상적인 교합자 159명의 석고모형을 대상으로 순측 및 협측 교두정을 지나는 하악치열궁선에서 견치간, 제1대구치간 및 제2대구치간 폭경과 이들의 고경을 계측한 다음, 유클리안 거리를 이용한 평균군집분석을 시행하여 치열궁형태를 5가지로 분류하고, 각각의 6차 다항식과 결정계수를 구하였으며, 교두정에서 브라켓 높이의 협면점까지의 거리를 계측하고 비교검토하여 다음의 결과를 얻었다. 1. 5가지 하악치열궁선을 실제의 크기로 작도하고, 1형, 2형, 3형, 4형 및 5형으로 명명하였다. 2. 각각의 치 열궁선은 하악 제2대구치간 폭경으로 표현되는 6차다항식과 결정 계수를 산출하였으며 이 식으로 $97\%$이상 설명이 가능하였다. 3. 각 치열궁선의 분포는 5형이 $24.5\%$로 가장 많았으며, 2형과 3형이 각각 $20.8\%$ 1형은 $17.6\%$, 4형은 $16.3\%$의 분포를 보였다. 4. 한국인의 하악치열궁선은 프랑스인에 비하여 폭경이 넓고 고경이 낮은 특성을 보였다. 5. 교두정에서 브라켓높이의 협면점까지의 거리는 절치가 1.0, 견치는 1.9, 제1소구치는 2.6, 제1 및 제2 대구치는 2.7 이였다.