• Bulletin of the Korean Chemical Society
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• v.33 no.7
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• pp.2145-2148
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• 2012

A new thiourea based receptor (1) was synthesized and applied to fluoride ion recognition in acetonitrile solution. Receptor 1 displayed dual changes in absorption and fluorescence emission intensities selectively for fluoride ions. The interaction of 1 with fluoride undergoes a deprotonation process that is confirmed by $^1H$ NMR titration.

• Journal of the Korean Magnetic Resonance Society
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• v.26 no.4
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• pp.40-45
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• 2022

A small cage-like molecule (2) composed of three aminomethyl pyrroles and two hexa-substituted benzenes has been prepared by reduction of its iminopyrrole analogue (1) using NaBH₄. It was revealed by ¹H NMR spectroscopic analyses that cage molecule 2 strongly binds the fluoride anion in polar DMSO-d₆ relative to CDCl₃. Compared to that of compound 1, the lowered affinity of 2 for the fluoride anion is attributable to its increased electron density resulting from the production of thesecondary amine groups.

• Journal of dental hygiene science
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• v.14 no.4
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• pp.580-588
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• 2014

Fluoride use is the best and widespread method for dental caries prevention. The aim of this study was to investigate experience and recognition of fluoride for caries prevention focusing on majors in one university. Four hundred twenty-four university students were selected by convenience sampling with informed consent and answered the questionnaire by self recording type. The subjects except dental hygiene students knew about purpose of fluoride use (84.6%), over the count fluoride rinse (63.2%), fluoride toothpaste (61.5%), professional fluoride application (56.4%) and water fluoridation (43.6%). They experienced over the count fluoride rinse (67.5%), school fluoride rinse (45.3%), professional fluoride application (30.8%), fluoride toothpaste (28.2%) and water fluoridation (12.0%). The main information paths about fluoride were university lectures among dental hygiene students and internet and mass media, followed by nurse-teachers among non dental hygiene students. The ratios of intention to use fluoride were: 67.8% in dental hygiene, 34.9% in health, 51.4% in non-health in case of professional fluoride application for oneself, 93.1% in dental hygiene, 48.0% in health, 50.4% in non-health in case of professional fluoride application for their children, 79.0% in dental hygiene, 51.3% in health, 55.8% in non-health in case of water fluoridation. The subjects to experience and recognize fluoride for caries prevention had more positive intention to use fluoride. The answers of students majoring in health or medical care were not different from non-health, except dental hygiene. Dental professionals should try to let the public know about fluoride use for caries prevention through mass media and internet as well as individual education in dental clinics.

• Bulletin of the Korean Chemical Society
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• v.35 no.12
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• pp.3437-3442
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• 2014

A well-known carbazole-based precursor (probe 1) was used for the detection of cysteine/homocysteine and fluoride. Probe 1 shows a "turn-on" response to cysteine/homocysteine and fluoride via enhancement in emission intensity at 442 nm and 462 nm respectively, in solutions and living cells. Furthermore, probe 1 behaves as a fluorescent molecular switch between cysteine/homocysteine and fluoride as the chemical inputs, which have been used for the development of a combinatorial logic circuit and a molecular keypad lock.

• Bulletin of the Korean Chemical Society
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• v.31 no.5
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• pp.1204-1208
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• 2010

Anion recognition via hydrogen-bonding interactions could be monitored with changes in UV-vis absorption spectra and in some cases easily monitored with naked eye. Urea receptors 1 and 2 connected with both an azo group and a nitrophenyl group as a signaling group for color change proved to be an efficient naked eye receptor for the fluoride ion. The anion recognition phenomena of the receptors 1 and 2 via hydrogen-bonding interactions were investigated through UV-vis absorption and $^1H$ NMR spectra.

• Journal of Korean society of Dental Hygiene
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• v.6 no.2
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• pp.165-174
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• 2006

In order to establish basic data before deciding on the ways to manage school dental hygiene project, this study polled 165 elementary school teachers. Collected data was used SPSS 12.0 statistics program and got the technical statistics and This research and analysis came to the following conclusion by using Fridmen rank test, Pearson's correlation. 1. To the question about how they acquire the knowledge of dental hygiene, 60.6 percent of elementary school teachers turned out to learn about it through mass media(TV, Internet, magazines). 2. Regarding the purpose to maintain dental hygiene, "the prevention of dental diseases" ranked highest, and next "the prevention of cavity" and "the cure of halitosis" appeared at the similar level, and "to become a good model of children" and "to serve the esthetic purpose" ranked lowest. 3. As to the ways to prevent cavity, regular visits to dental clinic and daily brushing turned out to be more effective preventation method. 4. As for the degree of recognition of fluoride, the correct answer about fluoride that is recovered slight caries is appeared 11.8%, that was lowest correct answer ratio.

• Journal of the korean academy of Pediatric Dentistry
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• v.28 no.1
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• pp.159-165
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• 2001

Fluoride has been used widely for the prevention of dental caries. Many dental professionals applicated acidulated phosphate fluoride(APF) gel for the purpose of prevention of dental caries in recent years. However, the topical application of fluoride varnish is growing and getting much recognition in many parts of Europe and Scandinavia. The main purpose of this study was to compare the effect of fluoride varnish and acidulated phosphate fluoride gel on artificial caries lesion. The artificial caries lesion was caused on the sound bovine enamel and divided 60 specimens into three groups each containing twenty for the purpose of study. No application was done on group 1, which acted as control group. Group 2 was treated with the topical application of fluoride varnish and removed after 1 hour Group 3 was treated with APF gel and removed after a minute. The cycle of remineralization/demineralization went on in vitro and the microhardness was measured for the each group after 5 and 15days. The following results were obtained : 1. According to the results after 5 days, the microhardness of groups 2 and 3 were significantly higher than group 1, the control group(p<0.05) Similar results was also noticed after 15 days(p<0.05) 2. In comparison of microhardness between groups 2 and 3 after 5days, there were no significant differences between them. The results after 15 days was also similar 3. Much difference in microhardness wasn't present in groups 2 and 3 after 5 and 15days. However, the microhardness of the group 1 dropped significantly in the result of 15 days and 5 days(p<0.05).

• Bulletin of the Korean Chemical Society
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• v.30 no.12
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• pp.3031-3033
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• 2009

A new colorimetric anion sensor 1 has been synthesized based on both Fat brown RR dye and a nitrophenyl group. This new receptor 1 could recognize the presence of fluoride ion effectively and selectively by the change of color of solution. In addition, receptor 1 shows higher affinity for acetate, dihydrogenphosphate, and hydrogensulfate than the other anions such as chloride, bromide, iodide, perchlorate, and nitrate in acetonitrile.

• Journal of Korean society of Dental Hygiene
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• v.16 no.4
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• pp.585-590
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• 2016

Objectives: The purpose of the study was to investigate oral health-related behaviors of some elementary school students by installation of toothbrushing facility. Methods: A self-reported questionnaire was completed, out by 377 elementary school students with toothbrushing facility, and by 260 elementary school students with no toothbrushing facility in M city from November to December, 2015. The data were analyzed by ${\chi}^2$-test, t-test and stepwise multiple regression analysis using SPSS 12.0 program. The questionnaire comprised toothbrushing practice(2 items), satisfaction of toothbrushing facility(1 item), oral health knowledge(4 items), fluoride recognition(1 item), and necessity of fluoride mouthrinse(1 item). Results: The level of oral health knowledge was high in toothbrushing facility school. But toothbrushing practice was higher in school of no toothbrushing facility(63.8%) than the school with toothbrushing facility(49.1%)(p<0.001). The number of brushing times a week was also higher in school of no toothbrushing facility(1.98 times) than the toothbrushing facility school(1.59 times)(p=0.011). The dominant reason for no brushing was not recognition(65.8%) in toothbrushing facility school, lack of places(61.3%) in non toothbrushing facility school. Conclusions: In order to improve the oral health in elementary school students, it is necessary to provide toothbrushing education and toothbrushing facility in elementary schools.

• Bulletin of the Korean Chemical Society
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• v.30 no.9
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• pp.2101-2106
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• 2009

A series of facial amphiphiles 3,7-diaminocholestane were synthesized from 3,7-diketocholestane via 2 sequential reductive aminations and anion recognition was evaluated with acetate, chloride, bromide, fluoride and phosphate anions. The stereo-selective reductive amination protocol was utilized to synthesized facial amphiphiles afforded receptors in high yields. The molecular receptor 2 showed the highest binding constant with acetate in a 1:1 ratio.