• The Journal of the Korea Contents Association
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• v.14 no.3
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• pp.259-268
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• 2014

The purpose of this study is to investigate correlation between experience of visiting the dentist and oral symptoms with 10,701 high school seniors in the research data of the 8th juvenile online health behavior carried out in 2012. The results of this research showed that the lower academic grades, the more tooth crack they experienced, and the lower economic conditions, the more toothache they tended to experience. The main reasons they visited the dentist were because their teeth ached, tingled or throbbed with pain. Scores of oral symptoms, sex, economic conditions and the number of experience of visiting the dentist were found to have a significant correlation. In order to improve high school students' dental health continually, we need to install the school dental health room and need to systemize continuous dental health care system for high school students, along with development of various school dental health education programs, by vitalizing prevention based school dental health education.

• Journal of Korean society of Dental Hygiene
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• v.12 no.3
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• pp.533-541
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• 2012

Objectives : The purpose of this study was to evaluate the effects of tooth bleaching agent contained 35% hydrogen peroxide on the color, microhardness and surface roughness of tooth-colored restorative materials. Methods : Four types of tooth-colored restorative materials, including a composite resin(Filtek Z350 ; Z350), a flowable composite resin(Filtek P60 : P60), a compomer(Dyract$^{(R)}$ AP ; DY), and a glass-ionomer cement(KetacTM Molar Easymix ; KM) were used in the study. The specimens($8mm{\times}5mm$) were made by using a customized acrylic mold. Each material was divided into two groups equally(n=40) : experimental group(35% HP) and control group(distilled water). 35% HP group was treated 30 mim/5 days for 15 days. Each 30 minute treatment session consisted of two 15 minute cycles of gel application with 20 second light exposure. The authors measured the color, microhardness, and roughness of the specimens before and after bleaching. The data were analyzed with ANOVA and T-test. Results : 35% HP group showed an apparent color change(${\Delta}E^*$) than control group. In particular, DY and KM showed a noticeable color change and statistically significant differences(p<0.05). 35% HP group showed a reduction in microhardness. Z350 and P60 does not have a statistically significant difference(p>0.05), DY and KM showed a statistically significant difference(p<0.05). Percentage microhardness loss(PML) of control group was 0.6 to 5.5% in the group, 35% HP group was 6.6 to 34.6%. Roughness was increased in 35% HP group after bleaching. Especially DY and KM were significantly increased(p<0.05). Conclusions : Bleaching agents may affect the surface of existing restorations; therefore, they should not be used indiscriminately when tooth-colored restorations are present.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.11
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• pp.4338-4345
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• 2010

The purpose of this study was to examine the oral care habits, health care awareness of 439 high school students in Gangwon Province. the largest group (46.9%) brushed their teeth over the three times a day on the average, and the biggest group(47.6%) brushed their teeth within 30 minutes after having a meal or snack. In for the major reason for toothbrushing, the greatest group(45.1%) brushed in order to keep their mouth clean, and the largest group (54.4%) tried to do toothbrushing in the right way to prevent dental caries. Knowledge on oral health was surveyed that the oral health knowledge was the highest in 1st-grade students by grade and that the students with the less monthly pocket money led to the higher knowledge by monthly pocket money. The right oral care and the oral-health education will need to be reinforced. The oral health education for high school students will be needed further so that the oral care habit can be settled with having right oral health recognition.

• Journal of Digital Convergence
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• v.17 no.3
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• pp.305-312
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• 2019

This study was conducted to effect the cell activity and cytotoxicity of dentifrice. For the study, 6 kinds of general dentifrice, 3 kind of whitening dentifrice, 2 kinds of natural dentifrice and SLS(sodium lauryl sulfate) of positive control group. Immortalized human gingiva fibroblast cell was used for the study, WST test for cell activity and Agar diffusion test for cytotoxicity. Agar diffusion test showed high cytotoxicity in general dentifrice test group and whitening dentifrice test group, but low cytotoxicity in natural dentifrice test group. As a result of cell nucleus staining, cell shape and nuclear activity showed that the highest activity in natural dentifrice group, followed by whitening dentifrice group and general dentifrice group. As a result of this study, the cytotoxicity of different ingredient and according to the use to dentifrice. As a result of this study, we confirm cytotoxicity of kind and components according to the purpose of using dentifrice. Therefore, it is necessary to indicate the detailed ingredients of dentifrice for the smart choice of consumers.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 1998.11a
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• pp.40-44
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• 1998

사용자에 게 친근감 있는 인터페이스를 제공하기 위해 자연스러운 얼굴 애니메이션에 대한 연구가 활발히 진행 중이다.[5][6] 본 논문에서는 자연스러운 얼굴의 표정 합성을 위한 애니메이션 방법 을 제안하였다. 특정한 사람을 모델로 한 얼굴 애니메이션을 위하여 우선 3차원 메쉬로 구성된 일반 모델(generic model)을 특정 사람에게 정합 하여 특정인의 3차원 얼굴 모델을 얻을 수 있다 본 논문에서는 한국인의 자연스러운 얼굴 표정합성을 위하여, 한국인의 표준얼굴에 관한 연구결과를 토대로 한국인 얼굴의 특징을 반영한 일반모델을 만들고 이를 이용하여 특정인의 3차원 얼굴 모델을 얻을 수 있도록 하였다. 실제 얼굴의 근육 및 피부 조직 등 해부학적 구조에 기반 한 표정 합성방법을 사용하여 현실감 있고 자연스러운 얼굴 애니메이션이 이루어질 수 있도록 하였다.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 1999.11a
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• pp.368-372
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• 1999

새롭게 표준화된 멀티미디어 동영상 파일 포맷인 MPEG-4에는 자연영상과 소리뿐만 아니라 합성된 그래픽과 소리를 포함하고 있다. 특히 화상회의나 가상환경의 아바타를 구성하기 위한 모델링과 에니메이션을 위한 FDP, FAP에 대한 표준안을 포함하고 있다. 본 논문은 MPEG-4에서 정의한 FDP와 FAP를 이용하여 화상회의나 가상환경의 아바타로 자연스럽고 현실감 있게 사용할 수 있는 얼굴 모델 생성을 위해서 보다 정교한 일반모델을 사용하고, 이에 근육 모델을 사용하여 보다 정밀한 표정 생성을 위해서 임의의 위치에 근육을 생성 할 수 있도록 근육 편집기를 작성하여, 표정 에니메이션을 수행할 수 있도록 에니메이션 편집 프로그램을 구현하였다.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 1999.11a
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• pp.373-378
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• 1999

얼굴 및 얼굴표정 연구의 기초 자료를 제공하고 실제 표정을 디자인하는 작업의 지침으로 사용되도록 하기 위하여 대규모의 표정 DB를 구축하였다. 이 DB 내에는 여러 가지 방법으로 수집된 배우 24명의 자연스럽고 다양한 표정 영상자료 약 1,500장이 저장되어 있다. 수집된 표정자료 각각에 대하여 내적상태의 범주모형과 차원모형을 모두 고려하여 다수의 사람들이 반응한 내적상태 평정 정보를 포함하도록 하였으며 사진별로 평정의 일치율을 기록함으로써 자료 이용에 참고할 수 있도록 하였다. 표정인식 및 합성 시스템에 사용될 수 있도록 각 표정자료들을 한국인 표준형 상모형에 정합하였을 때 측정된 MPEG-4 FAP 기준 39개 꼭지점들(vertices)의 좌표값들 및 표정추출의 맥락정보를 저장하였다. 실제 DB를 사용할 사람들이 가진 한정된 정보로써 전체 DB의 영상자료들을 용이하게 검색할 수 있도록 사용자 인터페이스를 개발하였다.

• Journal of Korean society of Dental Hygiene
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• v.10 no.3
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• pp.473-481
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• 2010

Objectives : To evaluate the effect of fluoride application on the color and microhardness of bleached enamel and compare it to that of casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) application. Methods : Twenty freshly extracted human adult molar were each sectioned into halves, the specimens divided and treated according to five experimental groups: Group 1, treatment with 10% carbamide peroxide (CP) bleaching agent; Group 2, treatment with 10% CP followed by a 1.23% fluoride gel application; Group 3, treatment with 10% CP followed by a 2.23% sodium fluoride varnish application; Group 4, treatment with 10% CP followed by a 0.11% sodium fluoride gel application; Group 5, treatment with 10% CP followed by a CPP-ACP gel application. All groups were treated 6 h per day for 14 days then immersed in distilled water for 2 weeks. Changes in enamel color were evaluated on Baseline and Day 14. Microhardness were evaluated on Baseline, Days 7 and 14. Statistical analysis was performed using one-way ANOVA and post-hoc Tukey tests. Results : All the bleached enamel specimens revealed increased whiteness and overall color value. Group 1 showed the lowest microhardness values than that of Groups 2, 3, 4 and 5. In all groups, the hardness of tooth after bleaching showed a significant decrease in the microhardness as compared with the one prior to tooth bleaching. The specimens treated with remineralizing agents showed relatively less reduction in enamel microhardness than control group. Conclusions : The addition of fluoride and CPP-ACP did not impede the whitening effect. The use of remineralizing agents during bleaching treatment can significantly enhance the microhardness of bleached enamel.

• Journal of Korean society of Dental Hygiene
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• v.12 no.5
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• pp.973-985
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• 2012

Objectives : The aim of this study is to investigate the possible impact factors on adults' self-reports of dry mouth and to develop strategies to improve oral health education policy. Methods : This study was conducted on a total of 622 self-administered questionnaires adult above 20 and under 65 years of age living in Seoul and Gyeonggi provinces. The final participants consisted of 443 adults without chronic illness, taking medications and wearing dentures. The Hierarchical Multiple Regression model with three stages was used to assess the association for exposure of interest, such as socio-demographics, health-related behavior, mental health and self-reported of dry mouth. Results : The participants reported mean score of dry mouth($6.32{\pm}4.47$), of which 191 were male($6.81{\pm}4.56$) and 252 were female($5.94{\pm}4.37$). Hierarchical Multiple Regression revealed that the score of dry mouth was shown to be significantly higher for the following people: Males, who were employed, unemployed, negative self-perceived general health, perceived stress, and participants who had no experience awareness of distress in two weeks. The explanatory power was 21.9%. The most powerful impact factor regarding to employment was shown to be negatively associated to dry mouth, and self-perceived general health, experiencing awareness of distressful in two weeks was also important factors. Conclusions : Based on these results in order to develop oral health education policy strategies for the prevention and management of dry mouth, there need to be considered for the employee.

• Journal of The Korean Dental Society of Anesthesiology
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• v.14 no.3
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• pp.143-149
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• 2014

Background: The purpose of this study was to analyze the equality between key words used in the Journal of Korean Dental Society of Anesthesiology and Medical Subject Headings (MeSH). Methods: A total of 666 English key words in 187 papers (average 3.5 words in a paper) from 2001 to 2014 were eligible for this study. We classified them according to matched, and non-matched terms. After descriptive analysis, we assayed patterns of errors in using MeSH, and reviewed frequently used non-MeSH terms. Results: Fifty nine point six percent (59.6%) of total key words were completely coincident with MeSH terms, 40.39% were not MeSH terms. Conclusions: The results show that the coincidence rate of key words with MeSH terms was at a moderate level. However, there is a need for us to understand MeSH more specifically and accurately. Use of proper key words aligned with the international standards such as MeSH is important to be properly cited. The authors should pay attention and be educated on correct use of MeSH as key words.