• Journal of Oral Medicine and Pain
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• 제26권2호
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• pp.147-156
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• 2001

The purpose of this study was to identify the difference of vertical movement of mandible according to Angle's molar relationship and by skeletal factors affect to vertical movement of mandible. 172(age ranged from 20 to 30) subjects who go to college within territory of Kwangju city without any experience of temporomandibular disorder, extraction and orthodontic treatment. were selected for this study. The subjects were classified into class I(male:30, female:49), class II(male:18, female:24) and class III(male:18, female:33) according to Angle's molar relationship. The distance was measured between incisal edge of maxillary and mandibular central incisor and between bottom of central fossa of maxillary and mandibular 1st molar with ruler. The arch length and width were measured on the diagnostic cast. Cephalometrics were taken and then traced. Landmarks were identified and analyzed. 1. Maximal interincisal opening of male is larger than that of female in class I, class II and class III. Among each group maximal interincisal distance is the largest in class III. Maximal intermolar distance of male is superior to that of female in class I, class II, and class III, but there is no siginficant difference among them. 2. On maximal opening movement of Angle's classification class I and class II, total mandibular length, mandibular ramal length, madibular inferior border length and upper arch width were important variables and facial length, upper arch length and lower arch length had negative relationship to that. On maximal opening movement of Angle's class III, the upper arch length, the lower arch length and anterior facial length were important variables especially when compared with class I and II, and upper arch width had negative relationship. These results suggest that maximal opening movement is affected by facial morphology in all classes, but each group is affected by different facial skeletal variables. Accordingly, facioskeletal variables might be considered as diagnosis and treatment to improve the amount of mouth opening.

• 대한소아치과학회지
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• 제40권1호
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• pp.21-27
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• 2013

현재까지의 많은 연구들을 통해 치아의 발육상태와 골격성 부정교합과의 연관성이 보고되어 왔다. 본 연구는 방사선학적 방법을 통하여 정상교합군과 하악 과성장형 골격성 3급 부정교합군의 상하악 치령 및 제2대구치 맹출률을 비교, 분석하여, 파노라마 방사선 사진으로 평가 가능한 상하악 치아성숙도의 차이가 하악 과성장형 골격성 3급 부정교합의 감별진단 요소로 의의가 있는지 알아볼 목적으로 시행되었다. 부산대학교 소아치과에 내원한 Hellman 치령 IIIA의 환자를 대상으로 정상교합군과 하악 과성장형 골격성 3급 부정교합군 각 50명을 선택한 후, 이들의 파노라마 방사선 사진을 이용하여 Demirjian법으로 각 군의 상하악 치령 및 제2대구치 맹출률을 구하고 그 차이를 비교, 분석하였다. 그 결과 정상교합군과 하악 과성장형 골격성 3급 부정교합군의 상하 치령의 차이는 각각 0.66세와 1.20세로 하악 과성장형 골격성 3급 부정교합군에서 유의하게 더 큰 차이를 보였으며(p < 0.05), 상하 제2대구치 맹출률은 두 그룹 간 유의한 차이를 보이지 않았다(p > 0.05).

• 한국노년학
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• 제40권1호
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• pp.33-49
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• 2020

본 연구는 사회적 배제의 잠재유형을 구분하고 노후의 경제적 불안에 미치는 영향을 실증적으로 분석하였다. 또한 주관적 계층의식에 따라 그 영향력이 달라지는지를 함께 살펴보고자 하였다. 이를 위해 2016년 한국종합사회조사(KGSS) 14차 자료를 사용하여, 조사 당시 기준 만 18세의 성인남녀 1,041명의 응답지를 분석하였다. STATA14와 MPLUS 7 통계프로그램을 이용하여 기술통계분석과 t-test, 잠재계층분석(LCA), 잠재집단에 대한 다항로지스틱분석을 실시하였다. 마지막으로 다중회귀분석을 실시하여 변수 간 영향관계 및 조절 효과를 확인하였다. 연구결과 사회적 배제의 유형은 3집단으로 나타났으며, 사회활동배제집단(49.3%), 다차원적 배제집단(30.9%), 사회 활동 적극집단(19.7%)의 순으로 나타났다. 사회활동배제집단은 경제, 고용, 건강 배제의 가능성이 가장 낮지만, 공식/비공식 사회활동의 배제가 두드러진 집단이며, 다차원적 배제집단은 모든 영역에서 배제를 경험할 가능성이 50% 이상인 집단으로 나타났다. 사회활동 적극집단은 비공식 사회활동에 매우 적극적으로 참여하는 것이 특징인 집단이다. 다항로지스틱 분석결과 사회활동배제집단은 다른 집단에 비해 청년층이 많이 포함되었으며, 다차원적 배제집단에는 배우자가 없는 여성노인이 많이 포함되어 있는 것으로 나타났다. 마지막으로 다중회귀분석 결과 사회적 배제 유형은 주관적 계층의식과 상호작용하여 노후의 경제적 불안에 영향을 미치는 것으로 나타났다. 이러한 연구결과를 바탕으로 노후의 경제적 불안을 예방하기 위한 정책적·실천적 방안을 제언하였다.

• 한국과학교육학회지
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• 제23권5호
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• pp.561-573
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• 2003

학생들의 학업 성취에 교사가 결정적인 역할을 한다. 본 연구는 학교 현장에서 이루어지고 있는 과학 수업을 과학 예비교사들이 분석하였다. 과학 교사의 수업을 분석 위한 검사 도구는 수업, 학생 행동, 교사 행동, 발문의 4가지영역으로 구성되었다. 100명의 과학 교사의 수업을 예비 교사들이 참관한 것을 분석하였다. 그 결과, 예비교사들은 과학 교사의 수업은 탐구 중심으로 이루어지지 못하고 있는 것으로 분석하였다. 교사의 성과 연령의 특성에 따라서 과학 수업에 통계적인 차이가 없는 것으로 분석되었다. 또한, 과학 수업이 개념 중심 그리고 교사 중심으로 수업이 이루어지고 있음을 분석하였다.

• 대한치과교정학회지
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• 제22권2호
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• pp.389-412
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• 1992

Along with form and function relationship of craniofacial growth comes a concern for the masticatory muscles with postnormal occlusion. It is the aim of this study to grope the certain differences upon the electromyographic activities of the masticatory muscles between normal occlusion and class II malocclusion during the varieties of oral functions. 26 persons of normal occlusion whose mean age were 18.9-25.6 years and another 26 persons of class II malocclusion whose mean age were 19.0-28.9 years served for this study. The electromyographic recordings processed by $Medelec^{\circledR}$ MS 25 EMG apparatus were taken from the anterior and posterior temporal, and anterior and posterior masseter muscles of both sides, and suprahyoid muscles as well. Analyses of the data toward such specific activities as mandibular rest, maximal biting, chewing gums and swallowing peanuts turned out the following summary and conclusions. 1. The maximal mean amplitude of the posterior temporalis showed significant augmentation in class II malocclusion, however the anterior temporalis, posterior masseter, and suprahyoid muscles manifested meaningful diminutions. 2. Stronger posterior temporalis and weaker anterior masseter and suprahyoid muscles were arranged in maximal biting with parameters of maximal mean amplitude. 3. The anterior temporalis of working side expressed smaller maximal mean amplitude in class II malocclusion. Significant swelling in duration were shown at anterior and posterior temporalis of working side, and posterior temporalis of balancing side in class II malocclusion, and marked reduction at anterior masseter of balancing side and posterior masseter of working side as well. The lessened latency were expressed at anterior masseter of working side, and anterior and posterior masseter of balancing side. Class II malocclusion group had significant prolongation of silent period duration. Mean silent period duration of 10.75 msec in normal occlusion and 24.37 msec in class II malocclusion were calculated. 4. Significant augmentations of maximal mean amplitude while swallowing peanuts were yielded at right anterior temporalis and posterior temporalis of both sides, however left anterior masseter and right posterior masseter showed diminution. No significant differences in duration showed at every muscle examined in class II malocclusion group.5. Weaker masseter and stronger temporalis were suggested as characteristics of class II malocclusion.

• 대한치과교정학회지
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• 제22권4호
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• pp.881-920
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• 1992

This study was designed to assess profile preferences among Korean youths in the year 1992. Facial esthetics was evaluated by means of silhouette profiles, eliminating the influence of a number of aspects that may affect judgment when normal lateral photographs are used. The main points of preference to be clarified here are as follows. First, on facial convexity, Second, on nasion depth, Third, on mentolabial sulcus depth, Fourth, on the position of upper and lower lips, Fifth, on facial type according to Angle's classification of malocclusion, Sixth, on Song's tangents. The 54 subjects printed in questionnaire as black and white silhouettes were selected from 300 tracings from cephalometric radiographs of people whose age ranging from 11 to 20 years. Photographs of six female subjects were retouched by computer graphic software and printed in color and black/white photographs which were used for adaptation of eyes of participants in selecting profiles in silhouette. They constitute 2 questions. The 54 subjects were grouped as 22 questions, each of them composed of 6 subjects, according to the aspects to be clarified. Twenty four questions in total were asked to assess profile preferences. For the assessment, the profile line, the facial esthetic triangle, Song's tangents, and Angle's classification of malocclusion were introduced. The profile line is composed of 11 component points which are Trichion, Glabella, Nasion, Pronasale, Subnasale, Labrale superius, Stomion, Labrale inferius, Supramentale, Pogonion, and Gnathion. The facial esthetic triangle is composed of 3 tangents: A-tangent which is the tangent of dorsum of nose, B-tangent which is the line passing through Sn and Ls, and C-tangent which is drawn on the turning point of the curve which lies between mentolabial sulcus (Sm) and pogonion (Pg). Angle's classification has 3 types of malocclusion which are Class I, Class II, and Class III. Class II malocclusion is subdivided into Division 1 and Division 2. The participants of the survey were composed of 861 college students (448 male students, 413 female students) whose majors grouped as Fine Arts. Liberal Arts, and Natural Sciences, and whose mean age 21.8 years. The statistics program SPSS/PC + of SPSS Inc. was used to analyze answers of participants. Crosstabulation, Chi-square test, and Kendall test were done. The conclusions are as follows: First, Korean youths have a tendency to prefer the slightly convex face to the flat or concave face. Second, they prefer a moderately deep nasion. Third, they prefer a moderately deep mentolabial sulcus. Fourth, they prefer the position of lips which are near to Ricketts' E-line. The position of the upper lip which is slightly posterior to E-line is preferred. The upper lip which lies too far anterior or posterior to the lower lip is not perferred. Fifth, they prefer most, according to Angle's Classification of Malocclusion, Class I facial profile which has a slight inclination to Class II division 2. The order of preference is Class I, Class II division 2, Class III, and Class II division 1. Sixth, they prefer the type 2 and 3 of Song's tangents. The facial profile within which A-and B-tangent meet is preferred. The facial profile which has Cotangent that .meets with A-tangent slightly posterior to the crossing point of A-and B-tangent or that parallels with B-tangent is preferred.

• 대한치과교정학회지
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• 제33권6호
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• pp.419-435
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• 2003

이 연구는 두부X선 규격사진을 이용하여 III급 부정교합자의 안모를 연령 성별로 분류하고,각 분류에 대한 두개 안면 형태의 특성을 구명하기 위하여 시행되었다. 정상교합자 60명과 III급 부정교합자 60명을 표본으로 하였으며 각 군은 10세, 12세, 14세 군 남녀로 구분되었다. 50개의 선 및 각계측치를 Krogman-Walker의 기준평면을 기준하여 측정하였다. 1. III급 부정교합군은 전방두개저의 길이와 안상각이 정상교합자군에 비하여 작고 하악골체와 하악수직고경이 큰 것으로 나타났으며, 이러한 차이는 남녀 모두 10세부터 유의하게 나타났다. III급 부정교합군에서의 하악하연각의 유의한 증가는 남녀 모두 12세때 나타났다. 2. III급 부정교합자군에서의 상악골의 후방 위치와 상악골체 크기의 유의한 감소는 남녀 모두 10세부터 나타난다. 3. III급 부정교합자군에서 유의한 하안면부 수직고경의 증가는 주로 하악골체 크기의 변화에 기인하는 것으로 관찰되었다. 하악골체의 경우 III급 부정교합자군에서 더 크고 전하방에 위치하는 것이 관찰되었다. III급 부정교합자군에서의 전체적인 수직고경의 유의한 증가는 12세군에서 유의하게 나타나기 시작한다. 4. 본 연구에서는 III급 부정교합자군에서의 두개저부각의 감소와 (Ba-S-N, 3A) 하악골체의 전방 위치는 남녀 모든 연령층에서 일관되게 관찰되었다. 이 결과는 Rothstein 등에 의해 주장된 II급 부정교합자군에서의 두개저부각의 변화가 하악골체의 전후방 위치에 영향을 주지 못한다는 주장을 부정하며, 디벳 등에 의해 주장된 앵글씨의 부정교합분류와 두개안면형태의 상관성에 대한 연구를 지지한다.

• 한국의류학회지
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• 제26권6호
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• pp.901-910
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• 2002

This study is to classify somatotypes of the upper class boys in elementary school. The study is conducted through anthoropometric measurements and photometric measurements. The subjects are 320 boys in the age group of 10 to 11 years old. The following conclusions are drawn from this study. 1. The height items are increased along with age increase. The increases in the factors, which specify vertical sizes such as height and length, are a little larger than those of breadth, depth, and girth, which specify ; horizontal sizes. 2. The factor analysis on anthropometric measurements and photometric measurements reveals five somatic composition factors and those factors comprised 79.60% of total variance. 3. The torso shapes of the upper class boys in elementary school are classified into three categories. The first type is taller and heavier than the average elementary school upper class boys and has the highest rising shoulders. The shape of the back is about average and the chest is developed above average. The curvature of the lower back is gentle and lower abdomen protrudes the most of the three types. The second type is tall and slightly heavier than average and shoulders are raised a little. The shoulder blades protrude about average and the curvature of lower back is the most developed of all. The cheat is developed about average and the abdomen is a little protruding. The third type is the most common with the smallest height of the three and skinny with dropped shoulders. The chest is somewhat flat and the shoulder blades protrude about average.

• 치위생과학회지
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• 제23권2호
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• pp.112-122
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• 2023

Background: This study aimed to evaluate the effect of a prefabricated functional appliance (Myobrace^®) on skeletal, dental, and soft tissue components in children with Class II, division 1 malocclusion. Methods: Thirteen patients with Class II, division 1 malocclusion (9 girls and 4 boys; mean age, 8.2±0.9 years at the start and 9.3±1.0 years at the end of the treatment) were treated with Myobrace^® for a mean period of 12.9±4.0 months. Patients were instructed to use the appliance daily for 1 hour and overnight while sleeping. A control group of 10 patients with untreated Class II, division 1 malocclusion (3 girls and 7 boys; mean age, 9.0±1.6 years at the start and 10.4±2.1 years at the end of the observation) was included to eliminate possible growth effects. The mean observation period for this group was 17.7±11.2 months. Lateral cephalograms were taken at the start and end of the treatment, and findings from 41 measurements were analyzed using the V-Ceph^TM program. The mean and standard deviation of cephalometric measurements were analyzed using paired and independent sample t-tests. Results: The treatment group showed significant changes in SNB, ANB, maxillary protrusion, ramus height, proclination of upper anterior teeth, interincisal angle, overjet, and upper lip protrusion compared with the control group. However, only decrease in ANB, maxillary protrusion, overjet, upper lip protrusion, and increase in interincisal angle were significantly higher in the treatment group than in the control group. Conclusion: The prefabricated functional appliance induced skeletal, dentoalveolar, and soft tissue changes, resulting in a significant reduction in anteroposterior discrepancy.

• 대한치과교정학회지
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• 제10권1호
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• pp.45-53
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• 1980

This study was based on the study models of 32 subjects with normal occlusion, 40 with Class I malocclusion, 32 with Class II, Division 1 malocclusion and 38 with Class III malocclusion, aged 12 to 20 years (mean age 16.4 years). The purpose of present study was to define the difference between normal and malocclusion groups in maxillary dental arch and palate. On the basis of findings of this study, the following results were obtained. 1. The intermolar widths and the intercanine widths in Class II, Div. 1 malocclusion group were smaller than in normal occlusion group significantly. 2. The arch lengths measured in both Class I and Class II, Div.1 malocclusion groups were larger than in normal occlusion group. 3. The palates in Class I and Class II, Div. 1 malocclusion groups were longer and narrower than in normal occlusion, but the palates in Class III malocclusion group were shorter than in normal occlusion group significantly. 4. The palatal depths measured at level 1 in Class III malocclusion group were significantly higher than in normal occlusion and in Class II, Div. 1 group they were significantly higher than in normal occlusion at level 2 and 3. 5. The measurements of palatal areas at various levels showed no significant difference between malocclusion and normal occlusion groups. 6. The palatal indies 1 (palatal length / palatal width) measured in both Class I and Class II, Div. 1 malocclusion groups were significantly greater than in normal occlusion and the palatal indice 2 (palatal depth at level 1/palatal width) measured in all malocclusion groups are greater than in normal occlusion. 7. It was determined from findings of this study that the measurements of maxillary dental arch and palate were influenced to a considerable extent by the molar relationship.