• Journal of the korean academy of Pediatric Dentistry
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• v.31 no.4
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• pp.714-720
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• 2004

This survey was performed as a pilot of comprehensive survey of 18-month old infants which is an important period in pediatric dentistry. Through the oral examination of 154 infants of 18-month age, labored at Pusan National University Hospital and Ilsin Christian Hospital, and direct interview with their first caregivers (mother in most cases), we investigated into the state of their weaning and feeding, between-meal snacks, oral hygiene care, tooth eruption and dental caries and obtained the results as follows : 1. 73% of the infants had not yet weaned, and 82% of which were being milked during or before sleep without oral hygine care. 2. Snacks were taken in order of fruits, biscuits, cheese, bread and candies, and beverages in order of water, fermented milks, milk, sugared juice, fresh fruit juice. 61% of the infants ate snacks irregularly. 3. The toothbrush for infants was the most popular way of oral hygiene care. The mean age of initiation of tooth brushing was 13.8 months and the mean frequency was 1.6 times a day. 4. The incisors in all infants, the 1st molars in 86%, and canines in 66% were erupted. The average number of erupted teeth was 14.1. 5. The caries prevalence rate was 27.3% and 73% of total caries was observed in maxillary deciduous incisors. dmft index was 0.97. Through these results, it was concluded that a systematic education about weaning time, mode of snacking and the way of oral hygine care is required for the parents.

• Journal of the korean academy of Pediatric Dentistry
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• v.32 no.3
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• pp.569-575
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• 2005

The aim of this study was to compare the efficiency of sonic and manual toothbrush in decreasing plaque accumulation in young orthodontic patients. Twenty one healthy orthodontic patients attending department of pediatric dentistry at Samsung Medical Center were chosen for the study. The subjects were randomly assigned to either sonic or manual toothbrush and instructed to brush for 2 minutes. Plaque score was assessed with the modified Visible Plaque Index (VPI) before and after brushing. Each brush was repeated twice. A mean plaque reduction of sonic toothbrush was 61.79%(${\pm}7.95$) compared to 69.19%(${\pm}10.08$) of manual toothbrush(p<0.05). With the sonic toothbrush, male presented a mean plaque reduction of 63.07%(${\pm}8.64$) while female presented 60.39%(${\pm}7.30$). For manual toothbrush, male presented 69.33%(${\pm}10.14$) and female presented 69.03%(${\pm}10.55$) reduction of plaque accumulation(p>0.05). There was no statistically significant correlation between age and plaque removal efficacy in this study(p>0.05). Manual toothbrush was significantly more efficient in removing plaque than the sonic toothbrush in young fixed orthodontic patients.

• Journal of Convergence for Information Technology
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• v.7 no.6
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• pp.9-17
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• 2017

This study was conducted in 241 fire officers at fire stations in Daejeon Metropolitan City to determine their oral health care behavior status and obtained the following results: First, men were more likely to brush their teeth 3 times a day and women were more likely to brush their teeth 4 times a day; those who were in their twenties and had ${\leq}5$ years of career brushed their teeth for ${\geq}3$ minutes. Second, the respondents who were in their twenties and thirties and had <10 years of career were more likely to use auxiliary oral hygiene devices and fire captains and those at higher positions were more likely to have received oral health education. Third, the respondents having received oral health education were more likely to use auxiliary oral hygiene devices and to have their teeth scaling within a year. While the fire officers were fortunately at good levels of oral health care, taking the poor working environment into account, the efforts to develop job-customized oral health programs in which IT and robot technologies are combined to improve oral health and take measures to publicize the programs and to give better treatment to fire officers are expected to put them in better oral health care status.

• Journal of Periodontal and Implant Science
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• v.31 no.2
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• pp.371-388
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• 2001

A novel glucanhydrolase(DXAMase) from a mutant of Lipomyces starkeyi(KSM 22) has been shown effective in hydrolysis of mutan, reduction of mutan formation by Streptococcus mutans and removal pre-formed sucrose-dependentadherent microbial film and DXAMase has been strongly bound to hydroxyapatitie. These in vitro properties of Lipomyces starkeyi DXAMase are desirable for its application as a dental plaque control agent. This study was performed to determine the adjunctive oral hygiene benefits and safety of dextranase(Lipomyces starkeyi KSM 22 DXAMase)-containing mouthwash when used alongside normal tooth-brushing. This 6-month clinical trial was placebo-controlled double-blind design evaluating 1U/ml dextranase mouthwash and 0.12% chlorhexidine mouthwash. A total 39 systemically healthy subjects, who had moderate levels of plaque and gingivitis were included. At baseline, 1, 3 and 6 months, subjects were scored for plaque accumulation(Turesky modification of Quingley-Hein's plaque index), gingivitis status($L\ddot{o}e$ and Silness gingival index), and tooth stain(Area and severity index system by Lang et al). Additionally, oral mucosal examinations were performed and subjects questioned for adverse symptoms. Two weeks after pre-experiment examinations and a professional prophylaxis, the subjects provided with allocated mousewash and instructed to use 20-ml volumes for 30s twice daily after toothbrushing. All the groups showed significant increase in plaque accumulation since 1 month of experiment. During 6 months' period, the Dextranase mouthwash group showed the least increase in plaque accumulation, compared to the Chlorhexidine mouthwash and placebo groups. As for gingival inflammation, all the groups showed significant increase during 6 months of experiment. The Experimental group(Dextranase mouthwash) also showed the least increase in gingival index score, compared to the Positive control(Chlorhexidine mouthwash)as well as the Negative control(placebo)groups. Whereas the tooth stain was increased significantly in the Positive control group, compared to the baseline score and the Negative controlgroup since 3 months of mouthrinsing. It was significantly increased after 6 months in the Experimental group, still less severe than the Positive control group. As for the oral side effect, the Experimental group showed less tongue accumulation, bad taste, compared to the Positive control group. From these results, mouthrinsing with Lipomyces starkeyi KSM 22 dextranase provided adjunctive benefits to toothbrushing, comparable to 0.12% chlorhexidine mouthwash in inhibition of plaque accumulation and gingival inflammation and local side effects were if anything less frequent and less intense than chlorhexidine, with long-term use of the mouthwash. All data had provided positive evidence for Lipomyces starkeyi KSM 22 dextranase as an antiplaque agent and suggested that further development of dextranase formulations for plaque control are warranted.

• Journal of the Microelectronics and Packaging Society
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• v.16 no.1
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• pp.45-50
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• 2009

By Laser Through-Silicon-Via process, debris and particles occur when you are forming. Therefore the research of TSV cleaning become important to remove those particles and debris. Both chemical cleaning method that uses a surfactant and physical cleaning method that uses a brush were studied with the via of $30{\mu}m$ diameter and $100{\mu}m$ depth on the 8 inch CMOS Image Sensor wafer. On the DI water and a surfactant in mixture ratio of 2:1, debris show $73{\mu}m^2$ per $0.054mm^2$. Cleaning is superior by lower mixture ratio of DI water and surfactant. In addition, It is less than 5% of debris distribution in the laser condition changed by Laser's frequency and its speed and cleaning had no effect. In the physical cleaning, there are no crack and damage when the system condition is set by $1000{\sim}3000rpm$ strip, $50{\sim}3000rpm$ rinsing, and $200{\sim}300rpm$ brushing Therefore, debris and particles can be removed by enforced chemical method and physical method.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.12
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• pp.5811-5818
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• 2011

This study was carried out in order to be used as basic data in developing oral health program for adolescents hereafter by surveying which influence it has upon oral health knowledge and recognition depending on students' subjective oral health status targeting middle school students. First of all, examining about students' subjective oral health status, the 2nd graders accounted for 36.2% depending on school year, thereby having been indicated to be high in response as saying of being healthy in own teeth. It was indicated that the higher level of brushing teeth after lunch at school leads to the higher response as saying of being healthy in own teeth(p<0.05). The group with response as saying of healthy in own teeth was indicated to be higher in regularly visiting once or twice a year as the period of visiting dental clinic, and was indicated to be higher(p<0.001) in a visit for oral check-up even as for the aim of visiting dental clinic than other groups. Accordingly, the aim is to offer an opportunity of motivation that students will have interest in oral health, by carrying out continuously oral health education, and is also to increase knowledge and awareness level on oral health by allowing them to have positive attitude toward oral health.

• Journal of Korean society of Dental Hygiene
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• v.4 no.1
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• pp.65-79
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• 2004

There are two purposes in this study. The first one is to collect some oral health information through the investigations upon the oral health care of Korean adults. Referring to the result of the investigation. I wanted to furnish fundamental data with oral health education for each age and with a publicity booklet editing. That is the second purpose of this research. Among the people who visited Seo-gu Public Health Center in Kwang-ju, 207 people answered the questionnaires. There were 86 men and 121 women from the 20-aged to the 59- aged. The questionnaires covers knowledge aquisition path for dental caries prevention, the cognition degrees for the causes of dental caries and its prevention, the cognition degrees for the causes of periodontal disease and its prevention, the degrees for oral health methods, and the importance of oral health. The conclusions are as follows; 1. The cognition degree for dental caries prevention: The cognition for pit and fissure sealant was appeared most highly in thirties by 85.3%. but 62.1 % in fifties was answered, "Never heard". The cognition degree for fluoride application was appeared most highly in thirties by 73.5%. and the cognition degree for water fluoridation was most highly in forties by 54.2%. 2. The knowledge for pit and fissure sealant was acquired mostly through dental hospital in every age by 54.2%. 3. The knowledge for fluoride application was learned mostly through dental hospitals in twenties and thirties by 32.7%. and mostly through TV or radio health programs in forties and fiftieseach by 35.7% and 50.0%. 4. The knowledge for water fluoridation was acquired through TV or radio programs in all ages such as twenties. thirties. forties and fifties. Its rate was 57.8%. 5. The cognition degree of the cause of dental caries: 53.1 % of all ages think that dental caries can most frequently be caused by being lack of toothbrushing. 6. The cognition degree of the cause of periodontal disease: 58.5% people of all ages think that both dental plaque and calculus might be the main cause of periodontal disease. 7. The cognition degree of dental caries prevention: 72.8% people think that dental caries can be prevented by right tooth brushing method. and 8.7% people think that they can be prevented by scaling. However, 10.7% people of them were not interested in dental caries prevention. 8. The importance of oral health: 35.3% people think that teeth health is the most important, and 63.8% people think oral health is one of the most important health problems. Forties answered that tooth health was the most important thing, and fifties. thirties and twenties followed in the order. 9. The cognition for oral health maintenance: all ages(twenties. thirties. forties. and fifties) answered that right toothbrushing method was the best way to keep oral health by 69.1%.

• Journal of Korean society of Dental Hygiene
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• v.6 no.4
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• pp.469-479
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• 2006

The purpose of this study is to prevent the oral disease and to improve the oral sanitation by investigating the behavior on the awareness of oral health aimed at the residents who lives in the Yeongdong-gun, Choongbuk, Korea. This study was carried out from September 26th to September 27th of 2006 and surveyed aim at 176 persons of residents of Yeongdong-gun. The results of this study can be utilized as a base data of program development on the oral health education of sectional residents and can be reached at the following conclusions. 1. The number of residents who have not experienced oral health education takes possession of 67.5% for men and 48.4% for women, the path how to learn of oral health education holds 67.7% for men and 51.6% for women(p<0.001). In case of the content of oral health education, prothodontics treatment is predominantly showed up as 60.2% for men and 44.2% for women(p<0.01). 2. The number of residents who has visited the dental clinics within 6 months holds 52.4% for men and 27.3% for women(p<0.01). With regard to the number of residents who has visited the dental clinics on the purpose of prevention(examination) of oral disease within 1 year, 'not experienced' showed up no differences as 52.4% for men and 57.6% for women. In case of the number of residents who has experienced prothodontic and conservative treatment, scaling is extremely much as 37.6% for men and 52.6% for women(p<0.05). 3. In case of brushing teeth, 2 times a day is the first rank of 52.3% on the frequency of toothbrushing and the time when brush your teeth after breakfast, lunch and dinner is 22.2%, 16.5% and 20.3% respectively. Below 2 minutes is 64.7% and over 3 minutes is 10.3% on how long do you brush your teeth. With regard to the method on how to brush teeth, `up, down & across' is the first rank of 35.2%. In case of utilization of oral hygiene utensils, the number of resident who is `not used' occupies 62.5%. 4. In the knowledge of oral health, 60.7% of residents replied that the cause of dental carious is the infection by the bacteria. The relationship between the smoking and oral health, 50.5% of them replied `Not relevant' and 33.6% of them replied `Relevant'. The average point of the correct response rate of 9 items related with the knowledge of oral health is merely showed up as 3.39 point. Therefore, it shows up that the knowledge and education related with the prevention of oral disease is much deficient.

• Journal of Korean society of Dental Hygiene
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• v.18 no.4
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• pp.441-453
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• 2018

Objectives: The purpose of this study was to contribute to the development of basic data for establishing and expanding the dental health centers in the future by examining the awareness of the dental health center establishment and the level of dental health knowledge in the school. Methods: A survey was conducted from April 2017 with 336 students over 10 years old in South Korea to investigate the awareness of the dental health center establishment in the school and their dental health knowledge level. The results were summarized as follows. Statistical analysis of the collected data was performed using the SPSS WIN 21.0 statistical program. Results: It was necessary to establish the dental health centers in the school with their establishment rate of 82.8%, and the reason for the establishment of the dental health center was the possibility of regular checkup with the highest at 43.6%. In the school, 62.8% answered no experience of dental health education with the highest rate. Dental health education in the school was answered to be necessary with 91.0% the most prevalent one. Factors affecting the recognition of the expected effect of establishing the dental health center in the school, it is expected that if the establishment of the oral health center is needed and the oral health education is needed in the school, And the perception of the effect is increased. Conclusions: 91% of the respondents considered that dental health education was necessary and 83% answered they needed dental hygiene. However, only 37.2% of the students experienced dental health education in the school. Therefore, it is necessary to expand the dental health center establishment, and to develop the foundation of life dental health care through regular dental examination and proper brushing education.

• Journal of Sericultural and Entomological Science
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• v.52 no.2
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• pp.123-128
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• 2014

We carried out an ecological survey for Ceratovacuna japonica, which lives in bamboos, at the experimental field of National Academy of Agricultural Science, Suwon and the several natural fields in Korea from 2010 to 2011. The releasing methods of C. japonica on Pseudosasa japonica was more effective at the brushing-off method than the pining-attached method. The successful rate of releasing was the highest at green house than others such as at outdoor, vinyl green house and in a insects net conditions. The survival limit of C. japonica was closely associated with the lowest temperature ($-10^{\circ}C$) of vegetative limit of P. japonica for over wintering because of two fields of Ilsan lake park and Guri ecological park showed falling down below $-15^{\circ}C$ two times in January. It provides for a reasonable distribution information of C. japonica that is restricted to south of Han River. However, the middle of Korea has rarely fallen down below $-10^{\circ}C$. Therefore, we consider that a successful rearing of C. japonica may be the most suitable in green house condition to overcome winter period.