• The korean journal of orthodontics
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• v.1 no.1
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• pp.38-42
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• 1970

• The korean journal of orthodontics
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• v.1 no.1
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• pp.43-46
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• 1970

• 대한치과교정학회:학술대회논문집
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• 1998.10a
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• pp.87.2-87.2
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• 1998

• 대한치과교정학회:학술대회논문집
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• 1998.10a
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• pp.88.3-88.3
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• 1998

• 대한치과교정학회:학술대회논문집
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• 2000.11a
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• pp.37.2-37.2
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• 2000

• 대한치과교정학회:학술대회논문집
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• 2003.10a
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• pp.107-107
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• 2003

• The korean journal of orthodontics
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• v.40 no.3
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• pp.176-183
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• 2010

Objective: This study was performed to evaluate functional changes of occlusion after orthodontic treatment by measuring the occlusal force (OcFr) and occlusal contact area (OcAr), and to compare OcFr and OcAr change according to premolar extractions. Methods: Data were obtained from 74 patients who had finished orthodontic treatment using fixed appliance aged between 18 and 40 years. Subjects were divided into groups who had four premolars extractions or non-extraction (Male extraction-16, Male nonextraction-18, Female extraction-19, Female nonextraction-21). All subjects were asked to bite pressure-sensitive sheets into maximum intercuspation with maximum bite force, and OcFr and OcAr were evaluated by measuring the sheet with a CCD camera. Records were taken right after debonding, 1 week, 1 month, 3 months, 6 months and 1 year after debonding. Results: OcFr and OcAr increased gradually in all groups during the 1 year retention period (p < 0.05). Male groups showed higher OcFr and OcAr than female groups throughout the retention periods (p < 0.05). There were no statistically significant differences of OcFr and OcAr between extraction and non-extraction groups in both males and females (p > 0.05). Conclusions: Occlusion was improved functionally throughout the 1 year retention, and premolar extraction did not induce a decline in the functional aspect of occlusion.

• The korean journal of orthodontics
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• v.37 no.1 s.120
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• pp.56-64
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• 2007

Objective: The purpose of this study was to evaluate the effects of malocclusion and orthodontic treatment on the self-esteem of adolescents. Methods: The subjects were composed of 3509 female middle school students. Each subject was evaluated with Rosenberg's Self-esteem Scale to measure the level of self-esteem and also evaluated the degree of crowding and soft tissue profile. Results: Results showed that protrusion of lip area had no effects on self-esteem but crowding of upper anterior teeth had significant effects. The fixed orthodontic treatment group and the removable orthodontic treatment group reported no significant difference in self-esteem from the no orthodontic treatment experience group, but the debonding group showed significantly higher Self-esteem index. Conclusion: The results of this study suggest that anterior teeth alignment has influence on the self-esteem of female adolescents.

• Proceedings of the KSME Conference
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• 2000.11b
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• pp.99-104
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• 2000

Calibration equation for Variable Temperature Anemometer(VTA) has been tested for measured velocity-output data and the calibration process has been compared with that of Constant Temperature Anemometer(CTA). VTA has greater sensitivity than that of any other conventional anemometers, but to be more popular technique in flow field measurement, simple, accurate and well established calibration process should be suggested. To meet this purpose, similar calibration method used for CTA has been adopted for VTA and finally calibration equation for VTA including the effect of temperature drift has been proposed.

• The korean journal of orthodontics
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• v.29 no.3 s.74
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• pp.361-374
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• 1999

Intraoral filled type of orthodontic appliance can cause reversible or irreversible damages such as gingivitis, periodontitis, enamel decalcification, dental caries, root resorption, and pulpal changes. Such adverse effects are brought by increase in dental plaque as well as oral flora. Such an increase causes gingival inflammation and enamel decalcification. The purpose of this study is to get klowledge on initial changes in dental plaque, gingivitis, and enamel decalcification after bonding fixed orthodontic appliances according to time flow, gender, and sides(right/left) of premolar region. For control group, 48 students of dental college, Yonsei university(26 males, 22 females) were chosen; for experimental group, 73 orthodontic patients(36 males, 37 females) who will be treated with fixed appliances were chosen. All the subjects had no systemic disease, juvenile periodontitis and all the females had passed their ,menarche. Tooth brushing instruction was given to all the subjects prior to the experiment. For control group, plaque index, gingival index, and decalcification index were measured twice at 3 weeks interval ; for experimental group, the same was done prior to, 3, 6, 9 weeks after bonding fixed appliances. The following results were obtained: 1. In plaque index 3 weeks after placement of appliances, and it showed gradual increase afterwards. 2. In gingival index3 weeks after placement of appliances, and afterwards it showed increase at a faster rate than plaque index. 3. Enamel decalcification began to show between 3 and 6 weeks after bonding fixed appliances. Decalcification index began to increase 6 weeks after appliance placement, but there was no statistical significance. 4. When the comparison was made between two sides of premolar region, the right side showed greater index in plaque and gingival index of experimental group.