• Journal of Korean society of Dental Hygiene
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• v.12 no.6
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• pp.1212-1220
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• 2012

Objectives : This study is designed to survey of proper practice of toothbrushing place in elementary school, middle school and high school in some part of Gyeonggi-Do, and will be utilized for toothbrushing place management. Methods : It was randomly selected, 8 elementary schools, 6 middle school and 6 high school in Gyeonggi-do, surveyed whole students. Survey duration was from May 11th to May 20th in 2011. The surveying paper was consisted of questions of general characteristics, right practice of toothbrushing and toothbrushing after lunch etc. It was done under teacher's control. The Data was analyzed with SPSSWIN 18.0. Results : Students did toothbrushing 2 times/day. It wasn't done by Elementary students of 56.3%, middle school students of 68.5%, high school students of 39.3%. It was dominant reason for no brushing that Carrying toothbrush and toothpaste was annoying. When students washed their hands and rinsed their mouth, they used toilet facuet in over than 90% schools. Satisfaction ratio was very low in elementary, middle, high schools. 60% of students wanted to get mouth rinsing place in each school or separately nearby toilet. Conclusions : It was thought by 60% students of elementary, middle, high school that toothbrushing after meals was most important activity. But It was not well done after lunch. When whole student did toothbrushing together, they couldn't use mouthrinsing place comfortablely. There were no keeping places for toothbrushes. So more attention should be payed to make plenty mouthrinsing places and manage them well.

• Journal of Korean society of Dental Hygiene
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• v.8 no.1
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• pp.59-71
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• 2008

This study was conducted to provide basic data required for the development of dental hygiene project for babies by investigating the relationship between mothers' dental hygiene activities and their socio-economic characteristics and the dental hygiene activities of babies. The survey was carried out with questionnaire to 306 babies of ages from 4 to 7 years and their mothers, from January 5 to January 25, 2007, in 4 kindergartens in Masan, Korea. The collected data was processed with SPSS v.12.0 for frequency analysis and ${\chi}^2$-test per item, to obtain following conclusions. 1. The frequency of toothbrushing of children is two times, accounted for 52.3%, they brush the teeth by them, and accounted for 52.3%, Fluorine toothpaste 68.3%. 2. The frequency of meal of children is 3 times, accounted for 93.5%, they ingestcariogenic snack 1 time, accounted for 45.4%, and they ingest protective and detergent snackfrom dental caries 2 times, accounted for accounted for 45.1%. 3. The shorter the period of mothers' duration of visit to dentists, the more experiences of fluorine coating and help from parent in toothbrushing had the children (pE.01, pE.05). 4. Children of housewife mothers received help from parent in toothbrushing and take teeth care and clean snack more than those of working mothers (pE.05, pE.01). 5. The children of working mothers had fluorine coating more than those of housewife mothers (pE.05). The fluorine coating, toothbrusing, protection and eating green food of babies show significant differences according to the frequency of mothers' visit to dentists and occupation.

• Korean Journal of Health Education and Promotion
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• v.13 no.2
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• pp.167-183
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• 1996

Human teeth vary widely in color. Practitioner and patients are concerned with preventing and correcting discolored or dark teeth to achieve and maintain stain-free, white teeth. Tooth brushing cannot alter tooth color but it can remove adhering films and stains. The esthetics of natural dentition can be improved by bleaching and this process can be applied to intrinsically and extrinsically stained teeth. The need for a brighter, more attractive smile has made rapid growth in the market for tooth whiteners. There is no doubt these products work as whiteners, at least on mild to moderate stains, but the safety of these products are unclear. In this experiment, the effect of tooth whitener application on the color and microhardness of extracted human enamel was measured. RMS, RMT and NWT were used as tooth whiteners, and tooth paste(ETQ) and hydrogen peroxide solution(HPO) were used as controls. 35 caries-free extracted human molars were embedded and polished with the exposed enamel diameter of 4 mm. The tooth whiteners and control agents were applied according to the manufacturers' instructions or clinically simulated procedures for eight weeks, and measurements were repeated every two weeks. Value(L＊) difference was measured using Differential Colorimeter(Model TC-6FX, Denshoku Co., Japan), and microhardness was measured using microhardness tester(Mitsuzawa Seiki Co., Japan). The results were as follows; 1. After application of agents for eight weeks, the Vickers hardness increased significantly in the ETQ, RMS and RMT application group(p〈0.01), and that decreased significantly in NWT application group(p〈0.01), but in HPO application group there was no significant change. The change in microhardness was greatest in NWT application group(p〈0.01). 2. After application of tooth whiteners and controls for eight weeks, the value change of toothpaste application group was significantly lower than those of other agents groups(p〈0.01), and there was no significant difference in value(L＊) change among tooth whitener groups(p〉0.01). 3. The application of tooth paste and paste type tooth whitener made gradual value change, but hydrogen peroxide gel type tooth whitener and hydrogen peroxide solution made rapid value change during initial application period.

• Journal of Korean society of Dental Hygiene
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• v.15 no.4
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• pp.719-725
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• 2015

Objectives: The purpose of this study was to determine the toxic effects of sodium lauryl sulfate(SLS) in human keratinocyte HaCaT cells and mouse fibroblast NIH-3T3 cells. Methods: The effect of sodium lauryl sulfate(SLS) cell viability and proliferation were determined by WST-1 assay and changes shape of nucleus were evaluated by Hoechst staining under fluorescence microscopy. Additionally, observation of cell morphological changes under light microscopy. Results: SLS induced cytotoxicity and a marked apoptosis in both HaCaT and NIH-3T3 cell lines. With the result of the WST-1 assay, SLS induced the cytotoxicity of 0.005% and 0.0075%, 0.01% SLS for 24 h after HaCaT and NIH-3T3 cells in time and dose-dependent manner(p<0.005). SLS inhibited cell growth and caused apoptosis as evidenced by nuclear fragmentation and condensation. Thus, determination of the morphological changes to define apoptosis was visualized using inverted phase contrast microscopy. Conclusions: SLS had toxicity of the human keratinocyte cells and mouse fibroblast cells and this study will provide the basic data for the development of proper SLS concentration in dentifrice.

• Analytical Science and Technology
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• v.23 no.5
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• pp.477-484
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• 2010

Personal care products are a diverse group of synthetic organic chemicals such as antimicrobial compounds, UV filters and organo-phosphate flame retardants and derived from individual usages of soaps, toothpaste and cosmetics. It has been detected in municipal sewage effluent and various environmental samples such as surface water, marine, soil, sediment and aquatic biota in many countries. The occurrence of personal care products in environmental samples could negatively impact the health of the ecosystem and humans, due to persistent, long-term chronic exposure of aquatic organisms. In this study, fifteen personal care products in aquatic environmental samples were determined by gas chromatography-mass spectrometry (GC-MS) with liquidliquid extraction (LLE). Method detection limits were in the range of $0.004\sim0.273\;{\mu}g/L$. Two compounds (TCEP, TCPP) were detected in surface waters and seven compounds (triclosan, 4-MBC, EHMC, BP-3, TCEP, TPP, TBEP) were detected in sewage treatment plants (STP) influents or effluents.

• Biomolecules & Therapeutics
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• v.24 no.1
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• pp.99-107
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• 2016

Triclosan is an antimicrobial or sanitizing agent used in personal care and household products such as toothpaste, soaps, mouthwashes and kitchen utensils. There are increasing evidence of the potentially harmful effects of triclosan in many systemic and cellular processes of the body. In this study, we investigated the effects of triclosan in the survivability of cultured rat neural stem cells (NSCs). Cortical cells from embryonic day 14 rat embryos were isolated and cultured in vitro. After stabilizing the culture, triclosan was introduced to the cells with concentrations ranging from $1{\mu}M$ to $50{\mu}M$ and in varied time periods. Thereafter, cell viability parameters were measured using MTT assay and PI staining. TCS decreased the cell viability of treated NSC in a concentration-dependent manner along with increased expressions of apoptotic markers, cleaved caspase-3 and Bax, while reduced expression of Bcl2. To explore the mechanisms underlying the effects of TCS in NSC, we measured the activation of MAPKs and intracellular ROS. TCS at $50{\mu}M$ induced the activations of both p38 and JNK, which may adversely affect cell survival. In contrast, the activities of ERK, Akt and PI3K, which are positively correlated with cell survival, were inhibited. Moreover, TCS at this concentration augmented the ROS generation in treated NSC and depleted the glutathione activity. Taken together, these results suggest that TCS can induce neurodegenerative effects in developing rat brains through mechanisms involving ROS activation and apoptosis initiation.

• Journal of Pharmaceutical Investigation
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• v.26 no.3
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• pp.221-232
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• 1996

An abrasive, calcium hydrogen phosphate dihydrate (DCPD), was synthesized in a Box-wilson experimental design by reactions between phosphoric acid and milk of lime, and calcium chloride and sodium phosphate solutions, and stabilized with TSPP and TMP. The optimum conditions for preparation of DCPD from phosphoric acid with milk of lime were such as; reaction temp.; $51.9^{\circ}C$, conc. of lime; 25.9%, conc. of phosphoric acd; 77.9%, drying temp.; $60.2^{\circ}C$ and final pH; 6.46. The physico-chemical and pharmaceutical properties of DCPD were showed as follows: glycerin absorption value(68 ml/100g), whiteness(99.5%), particle size(10.9 nm), pH(7.8), and set test(pass). XRD and SEM of DCPD indicated a monoclinic system crystallographically. $N_2$ adsorption isotherm curve by BET showed non porous type II form. The micromeritic parameters of DCPD showed that surface area was $3.27{\sim}4.6\;cm^{2}/g$ and pore volume, pore area and pore radius were negligible. The rheogram of the toothpaste containing DCPD showed pseudoplastic flow with yield value of 321, and thixotropic behavior forming hysteresis loop. These results meet the requirements as abrasive standard, and sythesized DCPD is expected as a good dental abrasive such as a high quality grade in practice.

• Journal of Korean society of Dental Hygiene
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• v.10 no.6
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• pp.965-972
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• 2010

Objectives : This study was conducted to improve oral heath behaviour of child by analyzing child's mother oral health behaviour. Methods : A total of 361(95.0%) 3-year-old-child's mothers who sent their child to child care institution in Daegu were analyzed from October 1, 2009 to October 31, 2009. Results : 1. In relation to general nature and experience on oral health education of child's mother, mother with higher monthly income, over than graduation from university and professional job had high oral health education experience, which was statistically related(p<0.01)(p<0.001). 2. In the case of mother with oral health education experience, this mother had higher dental clinic visit for 1 year, higher experience on scaling, higher good food preference for teeth health and higher use of floss, which was statistically related(p<0.05)(p<0.01). 3. Regarding child's oral management behaviour by mother's oral health importance, in the case that oral health was important, flouride toothpaste use, restriction on cavity inducting food and toothbrushing before sleep were higher only, which was statistically related(p<0.05)(p<0.001). Conclusion : In case of mother with oral health education experience, this mother had experience on dental clinic visit for prevention of cavity, dental clinic visit for treatment and restriction on food in which their child's oral health behaviour were satisfactory, which was statistically related.

• Journal of Korean society of Dental Hygiene
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• v.12 no.1
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• pp.27-35
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• 2012

Objectives : This study was performed to provide the basic data for oral health of infants, through the comparison of Streptococcus mutans activities(the representative bacteria of initial dental caries), in main nutritional foods for infants: breast milk, milk powder, and soya milk. Methods : The study targeted 30 infants and the saliva was sampled after the oral examination. The pH of sampled saliva was measured; and the sample of 'the saliva', 'the saliva and breast milk', and 'the saliva and formula milk' by researcher were produced; and the measurement was repeated 7 times. Results : As a result of examining the change of colony number of Streptococcus mutans by hour, the bacterial activity took in the source of nutrition took place in the first place; and in the group with dental caries, breast-feeding at night occurreds most frequently. Due to the combined activities, such as the increase in the contact time, the existence rate of dental caries appeared high. However, as the improvement of breast-feeding is closely related to the nutrition supply to babies, rather than the improvement of breast-feeding, the 12 hours after the culture in which Streptococcus mutans activities started was considered. Conclusions : In case of breast-feeding at night, it is necessary to remove the dental plaque in the mouth, before 12 hours has passed. Especially, using toothbrush and toothpaste to decrease the occurrence of dental caries, after the eruption of teeth, is recommended for oral administration.

• Journal of Korean society of Dental Hygiene
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• v.14 no.2
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• pp.173-179
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• 2014

Objectives : The purpose of this study is to provide the basic data for the development of oral health education program and to make schoolchildren practice the right oral health care behaviors. Methods : Data were collected from 259 elementary school students including 134 boys and 125 girls in Busan from November 26 to December 20, 2012. The groups were tooth brushing group and dental clinic group. All statistical analyses were analyzed by frequency analysis and chi-square test using SPSS 18.0 program. Results : School dental clinic group showed higher awareness level of fluoride and sealant effect of prevention(p=0.000). Toothbrushing facility group showed higher awareness level of brushing tooth(p=0.011). School dental clinic group showed higher awareness level of fluoride toothpaste(p=0.000). Both school dental clinic group and toothbrushing facility group showed higher awareness level of oral health education(p=0.001). School dental clinic group showed higher awareness level for tooth brushing method after education(p=0.000). Both school dental clinic group and toothbrushing facility group showed higher level of education. Conclusions : School dental clinic group showed higher level for oral health knowledge and toothbushing facility group showed high level for oral health behavior. Both School dental clinic group and toothbrushing facility group showed higher level of oral health education and tooth brushing method after education. Both school dental clinic group and toothbrushing facility group proved to promote oral health. Activation of school toothbrushing facility is very important to change the oral health workforce.