• Journal of Oral Medicine and Pain
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• 제18권2호
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• pp.43-53
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• 1993

The aim of this study was to investigate the relationship between the presence or absence of anterior tooth contact and the changes in temporomandibular joint space. The study sample consisted of 32symptom-free dental students and 79 craniomandibular disorders patients with unilateral joint dysfunction. The two groups were categorized into control group or experimental group, respectively. Recordings of the number and distribution of occlusal contacts were made by T-Scan system. Transcranial radiographs were taken with using of accurad-100 head positioner. Measured items in transcranial radiographs were anterior, superior, posterior joint space and relative condylar position to deepest position of glenoid folla. According to the presence or absence of anterior tooth contact, each group was subdivided and compared with each other with respect to TM joint space. Data were processed and tested with SPSS/PC + package. The results of the study showed that the joint space in control group were wider than those of experimental group and the difference of the width of joint space was more remarkable in subjects with anterior contact between control group and experimental group. However, in same group whether the presence of anterior tooth contact could hardly affect the difference of the width of joint space. And anterior tooth contact in grouip are more frequent than in experimental group.

• The korean journal of orthodontics
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• 제22권3호
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• pp.617-626
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• 1992

This study was conducted for the assessment of the usefulness of masseteric silent period on electromyogram as a diagnostic method for temporomandibular disorder. Of students and dentists in Dental College of Yonsei University and patients, 36 experimental subjects with symptoms such as clicking bound, pain in the temporomandibular joint area and limitation of jaw movement, and 33 control subjects without such symptoms were selected for this study. On each subject electromyographic masseter muscle silent period followed by mention tap was recorded with surface electrodes and analysed with computerized system. The following results were obtained: 1. The mean silent period was $36.97{\pm}9.23$ msec in experimental group, and $25.62{\pm}5.24$ msec in control group respectively. 2. There were no statistically significant differences in silent period between male and female in either experimental and control group. 3. Silent periods in experimental group were more prolonged than those of control group. (P < 0.01) Taken all together, electromyographic masseter muscle silent period may be useful for diagnosis and evaluation of temporomandibular disorder.

• Journal of Oral Medicine and Pain
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• 제14권1호
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• pp.19-24
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• 1989

The purpose of this study was to investigate the reliability of electromyographic examination in a day and detect the objective measurement timing of electromyography. 18 normal students who were in dental collage of C national university were selected for this study. They had no symptoms on temporomandibular joint area, no restorations and missing tooth on dentition. Their molar relationship was normal or class I of Angle's classification. Electromyography had been taken every one hour from 9:00 A.M. to 5:00 P.M. in the state of clenching and rest by using Bioelectric processor EM2 interfaced with mandibular kinesiograph K-6 diagnostic system. We compared and analyzed the variances of electromyography values of each subjects. The obtained results were as follows : There were no significant differences on variability of electromyography values in each state clenching and rest. In the aspect of this circumstances, the use of electromyography could be a good objective procedure to diagnose the temporomandibular disorders and to detect the effect to the treatment of temporomandibular disorders at any time in a day from 9:00 A.M. to 5:00 P.M.

• Journal of Oral Medicine and Pain
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• 제39권1호
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• pp.15-21
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• 2014

Purpose: The purpose of this study was to investigate the relationship between personality type and oral hygiene controllability. Methods: Four hundred eighty-two college students in Gyeonggi-do completed the Myers-Briggs type indicator (MBTI) and a questionnaire and collected data were analyzed by SAS 9.2 program. Results: Compared to extroverted subjects, a significantly increased percentage of introverted subjects demonstrated oral malodor and stress (p<0.05). Tongue coating and stress seemed to occur the most frequently in intuition-feeling (NF) type, while oral malodor seemed to occur the most frequently in sensation-feeling (SF) type among four fuctional types. Tongue coating and stress seemed to occur the most frequently in NF type, while oral malodor seemed to occur the most frequently in sensation-perceiving (SP) type among four temperaments. Significantly increased mean scales of tongue scraping index and oral hygiene controllability index were found for extroverts (p<0.05). Mean scales of tooth brushing index and oral hygiene controllability index appeared to be the highest in NF type among four fuctional types. Mean scales of tongue scraping index and oral hygiene controllability index appeared to be the highest in sensation-judging (SJ) type among four temperaments. Conclusions: Oral hygiene controllability was associated with personality type and it is necessary to develop oral health education program considering personality type.

• The Journal of Korean Academy of Prosthodontics
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• 제31권1호
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• pp.39-50
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• 1993

The purpose of this study was to investigate the association between characteristics of temporomandibular joint sound and possible contributing factors of temporomandibular joint sound. 1487 high school students (798 men and 689 women) aged from 16 to 18 were asked by questionnaires which was made for this study by T.M.J. clinic, dental infirmary, School of Dentistry, Chosun University, and data obtained from questionnaires were analyzed by chi-square test. The following results were obtained: 1. The prevalence of temporomandibular joint sound were found in 35.7% of all the subjects. 2. Temporomandibular joint sound could be unchanged, reduced and increased frequencey over time dependent on the individual. 3. The intensity of temporomandibular joint sound could be unchanged and increased during the chewing of hard food dependent on the individual. 4. The unilateral chewing and bruxism were not considered as possible contributing factors upon the occurring of temporomandibular joint sound. 5. Statistical significant association was found between clenching, stiffness, stress and tempore-mandibular joint sound, respectiely.(P<0.001, P<.01, P<0.05).

• Journal of Dental Rehabilitation and Applied Science
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• 제22권4호
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• pp.271-281
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• 2006

Long term prediction of surgical result of skeletal class III has not been evaluated adequately because the stability of orthognathic surgery would be affected by not only set back amount of mandible but also many other factors like skeletal pattern, hyoid position, and airway size. The aimof this study is to discriminate the factors which affect the stability of post-treatment result of surgical outcome of sagittal split ramus osteotomy. We have collected 37 patients (male: 17, female: 20) from patients who have been treated at Orthodontic Department in Dankook University. The patients underwent 3 times Cephalometric X-ray taking at pre-, post-orthognathic surgery and after 12 months retention. The subjects were divided into 2 groups (Stable group: 21, Relapse group: 16) according to their relapse amount. We have taken following results from Students t-test and discriminant analysis. The discriminant factors which discern relapse and stable groupe among treatment change variables were BX and Ba-HY. Hyoid bone moved to posterior and inferior position due to surgery and repositioned superiorly and posteriorly during retention period. Skeletal patterns of the relapse group are smaller mandibular plane angle, anterior mandibular position, and greater distance from hyoid bone to cervical bone and mandible respectively.

• The Journal of Korean Society for School & Community Health Education
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• 제17권1호
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• pp.59-73
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• 2016

Objectives: The working environment affects employees' physical and mental aspects, and has a deep associations with depression. The purposes of this study are to investigate how hazardous environment working experience impacts on depression, to provide rationale and practical implications for reducing depression and drinking. Methods: This study targeted 215 dental hygiene students from 3 universities located in Gyeonggi-do from November 30 to December 4, 2015. We analyzed the data with frequency analysis, descriptive statistics, t-test. One-way ANOVA, Pearson correlation coefficient, Regression analysis by using SPSS. Results: This study showed that experience working in hazardous environments increased depression and alcohol drinking, on the other hand alcohol drinking reduced depression. In addition, experience working in hazardous environments effected on depression indirectly through mediating of drinking, subjective health had not role of Moderating Effects between experience working in hazardous environments and depression. Conclusions: In order to reduce workers' depression and alcohol, the improvements of harmful environment are needed. For this governments and local governments should efforts to support enhancing workplace environment, to develop model of standard work environment, and to change employers' awareness on the harmful environment.

• The Journal of the Korea Contents Association
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• 제14권5호
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• pp.272-280
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• 2014

This study was researched by practical method in a subjectivity study accessible in-depth, in sloughing off old habit of functional quantity analysis about utility awareness of medical machinery. The perception pattern come out in this study were divided into three types in Q-methodology. The result is as follows ; it is that divided '1[(N=11) : Safety & Importance of Advertising 1], 2[(N=9) : Safety & Importance of Advertising 2], 3[(N=10) : Safety & Endurance]'. Like this, it found that is very different type all over. Hereafter, this study is to ascertain acceptance behavior about reception type on utility awareness of medical machinery ; to offer a developmental suggestion about it.

• Journal of the Korean Society of School Health
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• 제18권2호
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• pp.1-13
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• 2005

Purposes： This study was designed to survey current and past health promotion programs in schools and to assess the needs of health promotion programs based upon the opinions of health teachers. Methods： Self-report questionnaire were given to health teachers who attended board meetings in each province or who participated in a qualification training course in Daegu. The questionnaire was developed by authors and revised it based on experts' advice. Results： The most common health promotion programs were sexual education, sexual violence prevention, drug abuse prevention, first aid,dental health. In contrast, many mental health promotion programs, such as suicide prevention, ADHD, and those involving personality disorders were all relatively uncommon. The needs of health promotion programs showed almost same priority with health promotion programs that are being done. Conclusions： The development of effective health promotion programs requires input from students, parents, teachers, experts, and health teachers.

• The korean journal of orthodontics
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• 제17권1호
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• pp.55-62
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• 1987

Diagnosis and treatment plans of patients are depended on cephalogram in most case. However, conventional cephalogram may change diagnosis because it ignores a conception of natural head position. The purpose of this study was to investigate the difference of head positions between conventional X-ray taking and x-ray taking in natural head position, and correlation between above results and craniofacial morphology, 60 male students in dental college, Yon sei Univ. were selected, and every cephalogram is studied by comparison of the change of head position. The results are as follows. 1. When taking X-ray by using conventional method, external auditary meatus FH was more tilted than ear rod FM by $2.1^{\circ}{\pm}1.8$ in forward and downward direction. 2. As facial form becomes concave, natural head position and head position, appeared in X-ray taking by using conventional method, become more similiar. 3. Change in head position had showed high correlations with facial form (N-A-Pog angle), and there was high significance to concave group when compared with average group, but significance to convex group was not found. 4. Multiple regression equation concerning change of head position was solved. ${\Delta}FH=24.5\;+\;0.31$ NAPog + 0.43 Prominence of Chin + 0.13 Facial length -0.32 Anterior facial height.