• Journal of the korean academy of Pediatric Dentistry
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• v.35 no.1
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• pp.83-91
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• 2008

Dental caries which is one of the most common chronic disease complexly developed by the action of oral bacteria, diet, and host factor. Various prevention program enhance resistance of demineralization and reduce the acidogenecity of oral bacteria have been introduced, representative material is fluoride and chlorhexidine. The purpose of the study was to evaluate and compare effectiveness of fluoride varnish and chlorhexidine varnish in vivo. Bovine tooth specimens were implanted in the lower space maintainers and applied with fluoride varnish and chlorhexidine varnish. After seven days in oral environment, metal mesh was covered to make similar condition of plaque accumulation and induce caries. All specimens were analysed by EPMA to evaluate quantitative change of Ca, P and by polarized microscope to identify histological changes. The results were as follows : After initial artificial caries induction in the mouth, there were remarkable enamel caries lesion in the control group under polarized light microscopy. The highest amount of mineral decrease were showed in control group. No statistically significant mineral decrease were showed in fluoride varnish group, while chlorhexidine varnish group showed only significant decrease of P(P<0.05). In conclusion both fluoride varnish and chlorhexidine varnish seemed to be effective for protecting enamel surface from caries activity, although fluoride varnish has more anticariogenic effect than chlorhexidine varnish.

• The Journal of the Korea Contents Association
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• v.10 no.8
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• pp.240-248
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• 2010

This study used 3 kinds of experimental toothpaste prepared with different contents of SLS, i.e. A (0%), B (1.1%), C (2.2%). These 150 subjects were subdivided again into three groups. After 4 weeks application of the three kinds of toothpaste, it was found that there were differences in dental plaque test (PHP) among the 3 groups; that is; a higher SLS content was associated with a lower PHP index. In addition, it was found that all 3 groups showed a reduction in simplified oral hygiene index (OHI-S). After 4 weeks application of the three groups of toothpaste, it was found that a higher SLS content was associated with a lower salivary flow, but there was no significant variation in salivary mucosity and pH. Further, it was found that SLS was negatively correlated with salivary flow, which supports the theory that SLS may induce xerostomia.

• Korean Journal of Microbiology
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• v.23 no.1
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• pp.43-48
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• 1985

Strict anaerobic procedures and anaerobic chamber were employed in order to improve the isolation of obligate anaerobes from oral pyogenic infections. Also different culture media were utilized to maximize bacterial recovery. Two blood media: nalidixic acid Tween blood agar (NATB) and plain blood agar (BA), two non-blood media: nalidixic acid Tween agar (NAT) and Gifu anaerobic medium (GAM) were used and compared for their isolation efficacy. Specimens from seven patients were collected with syringe. After collection, the needle was sealed with sterilixed silicone rubber and brought to labortory. The time spent from specimen collection to its processing in anaerobic chamber usually was 15 min. Identification of isolated bacterial strains was done with the API-20A system. Increase in isolation of anaerobic vacteria was achieved. Obligate anaerobic bacteria isolated were 3.3 strains per specimen. This figure falls within the range of 1.9-4.4 strains per specimen reported in other countries. With respect to the media utilized, blood media were superior to non-blood media. NATB medium was effective especially for the isolation of Gram-positive cocci. A total of 15 species of Gram-negative rods was isolated and 12 of them belonged to Bacteroides.

• Korean Journal of Microbiology
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• v.54 no.2
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• pp.146-148
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• 2018

Fusobacterium animalis (formerly Fusobacterium nucleatum subsp. animalis) is a Gram-negative, anaerobic, and filament-shaped bacterium. F. animalis may be a part of normal flora and a periodontopathogen of human oral cavity. F. animalis KCOM 1280 (= ChDC F318) was isolated from a human periodontitis lesion. In this report, we present the draft genome sequence of F. animalis KCOM 1280.

• Journal of Korean society of Dental Hygiene
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• v.23 no.1
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• pp.33-42
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• 2023

Objectives: Based on the strengths of augmented reality (AR), this study aimed to determine the dental plaque removal efficiency of a guided brushing program in children. Methods: This randomized, controlled, double-blind crossover clinical trial evaluated the plaque removal rate after regular brushing versus AR-based guided toothbrushing in 20 children aged 5-12 years. Results: Overall, the dental plaque removal efficiency of AR-based brushing was superior to that of regular brushing (p<0.05). When classified in detail, no significant difference was noted in the plaque removal rate between the two brushing methods in the anterior region (p=0.056), whereas a significant difference in the plaque removal rate was observed in the posterior region (p<0.05). Conclusions: Based on these results, the efficacy of dental plaque removal for brushing using an AR-based smartphone application was confirmed; thus, this can be used for oral health education incorporating ICT technology in the future.

• The korean journal of orthodontics
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• v.39 no.2
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• pp.105-111
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• 2009

Objective: To estimate the effects of bracket material type on enamel decalcification during orthodontic treatment, this study analyzed the adhesion level of mutans streptococci (MS) to orthodontic bracket materials in vivo. Methods: Three different types of orthodontic bracket materials were used: stainless steel, monocrystalline sapphire, and polycrystalline alumina. A balanced complete block design was used to exclude the effect of positional variation of bracket materials in the oral cavity. Three types of plastic individual trays were made and one subject placed the tray in the mouth for 12 hours. Then, the attached bacteria were isolated and incubated on a mitis salivarius media containing bacitracin for 48 hours. Finally, the number of colony forming units of MS was counted. The experiments were independently performed 5 times with each of the 3 trays, resulting in a total of 15 times. Mixed model ANOVA was used to compare the adhesion amount of MS. Results: There was no difference in colony forming units among the bracket materials irrespective of jaw and tooth position. Conclusions: This study suggested that the result of quantitative analysis of MS adhesion to various orthodontic bracket materials in vivo may differ from that of the condition in vitro.

• Journal of Oral Medicine and Pain
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• v.34 no.3
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• pp.237-245
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• 2009

The purpose of this study was to investigate the clinical efficacy of latex cover developed for dental handpiece on contamination of microorganisms during dental treatment and to determine whether it can be an alternative to conventional sterilization such as autoclaving. E. fecaelis was used as a experimental microorganism instead of oral flora. Experimental bowl with 2 cm of rectangular cavity was fabricated for handpiece operating instead of oral cavity. Latex covers ($Orokeeper^{(R)}$, Orobiotech Co., Korea) and several handpieces were used after sterilization by autoclave. Four experiments were performed to evaluate bacterial contamination related with (1) various parts of dental handpiece, (2) swabbing time with alcohol sponge, (3) postoperative air-water spraying time and (4) consecutive use of latex covers without autoclaving. The results show that face of handpiece uncovered with latex cover was severely contaminated than the covered area and that most bacteria were removed by swabbing face and head area of dental hand-piece and by air-water spraying more than 15 seconds nearly up to the level of sterilization. Conclusively it can be suggested that use of latex cover for handpiece during dental procedure, swabbing with alcohol sponge is air-water spraying for more than 15 seconds after use of dental handpiece should be very useful and practical for prevention of cross infection and should be an alternative method for the sterilization of dental handpiece under some difficult situations not being able to sterilize a handpiece with autoclave.

• The Journal of the Korea Contents Association
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• v.19 no.5
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• pp.455-463
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• 2019

This study aimed to find out the effects of oral health education between the experiment group and the control group upon motivating them using oral facial program in 56 subjects including 29 members in the experiment group and 26 in the test group. With the collected data, Wilcoxon signed rank test was performed to understand the difference before and after the program. OHBI in the experiment group showed significantly higher than the control group (p<0.05), mean values after the program with $9.57{\pm}1.44$ and $8.68{\pm}1.46$ points in the experiment group and the control group, respectively. Mean QHI score in the experiment group was $1.00{\pm}.14$ points after the program while that in the test group was $1.03{\pm}.23$, demonstrating lower in the experiment group but not statistically significant. Mean scores of program satisfaction level were $4.13{\pm}.17$ and $3.94{\pm}.22$ points in the experiment group and the control group, respectively, demonstrating statistically significant. Based on the study results, the effects of oral health education using orofacial program showed the differences between the groups in dental plaque index and oral health behavior index. It is worth to use the oral facial exercise program as a tool for improving the authoring function and oral hygiene.

• 보건세계
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• v.43 no.11 s.483
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• pp.4-7
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• 1996

폐는 산소가 많이 포함된 신선한 공기를 혈액에 공급하여 줌으로써 우리 몸의 활동유지에 필요한 산소를 공급해 줌과 동시에 신체의 활동에 의하여 생성된 이산화탄소를 몸밖으로 배출하는 작용을 주로 하는 기관이다. 따라서 폐는 본연의 기능을 유지하기 위하여 계속적으로 외부의 공기를 흡입하여야 한다. 이 과정에서 외부에서 균으로 오염된 공기를 흡인하거나 또는 폐에 도달되기 전에 공기가 거쳐 지나가게 되는 구강 및 인후가 균으로 오염되어 있다가 오염된 분비물이 기도로 흡인되거나 하는 경우에는 폐실질에 염증이 발생할 수 잇는데, 이러한 경우를 폐렴이라고 한다. 이밖에도 다른 외부장기의 감염이 혈행성으로 폐로 전이되어서 폐렴이 발생할 수도 있다. 폐렴의 원인균은 각종 세균, mycoplasma, chlamidae, rickettsiae, virus 등 매우 다양하며, 균이 아닌 자극성 물질 또 호산구의 폐침윤 등에 의해서도 폐렴이 발생할 수 있다.

• The Journal of the Korean dental association
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• v.23 no.2 s.189
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• pp.121-127
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• 1985