• Journal of the korean academy of Pediatric Dentistry
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• v.31 no.3
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• pp.506-515
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• 2004

The objective of this study was to compare the rate of in vitro demineralization of bovine permanent (BP), human deciduous (HD) and human permanent (HP) enamel. Twenty aye flattened and polished enamel samples for each group (BP, HD, HP) were immersed in a demineralizing solution (0.1 mol/L lactic acid, 0.2% Carbopol 907, and 50% saturated hydroxyapatite) for 1, 2, 4 or 8 days. All 25 samples from each group were subjected to Quantitative light induced fluorescence analysis (QLF) and 5 samples from each group were randomly selected for Transverse Microradiography analysis (TMR). Integrated mineral loss (IML) and lesion depth (LD) were determined by TMR. The fluorescence radiance (FR) of sound enamel $(FR_S)$, demineralized enamel $(FR_D)$ were determined by QLF and FR ratio $(FR_D/FR_S)$ was calculated. Bovine enamel samples showed significant correlation between FR ratio and lesion depth(p<0.05) and deciduous enamel samples does not showed significant correlation between FR ratio and lesion depth(p>0.05). Permanent enamel samples showed significant correlation between FR ratio and lesion depth(p<0.05) The constant of demineralization time between FR ratio from regression analysis were as follows: bovine enamel was -4.643(p<0.05) deciduous enamel was -5.421(p<0.05) and permanent enamel was -4.435(p<0.05).

• Journal of dental hygiene science
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• v.5 no.1
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• pp.19-24
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• 2005

The purpose of this study was to examine the oral health states of elderly people over the age of 65 from the city of Seongnam, including the number of present permanent tooth, dental caries, rate of treatment need, CPITN and use of prosthesis, in a bid to lay the foundation for improving elderly oral health programs. The findings of the study were as follows: 1. The DMF rate of the male senior citizens stood at 98.3 percent, and that of the women numbered 99.0 percent and DMFT index 20.8. 2. The number of present permanent tooth excluded the third molars was 13. 3. Regarding CPITN, $CPITN_1$ was 74.9 percent, and $CPITN_2$ was 56.2 percent. $CPITN_3$ was 8.0 percent. 4. The rate of full denture wearing of the elderly people was 26.1 percent in the upper part and 17.8 percent in the lower part. And their rate of full denture need was 7.4 percent in the upper part and 4.3 percent in the lower part. 5. Establishing an planned abject for Oral health, Seongnam City has reviewed the necessity of development on enhancement of Oral health.

• The Journal of the Korea Contents Association
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• v.13 no.9
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• pp.305-311
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• 2013

This study analyzed the oral status after recording the images by using QLF-D with targets of 38 youth people with hearing impairment and hearing language impairment. In order to investigate the state of oral hygiene, plaque index (O'Leary index) and contents of investigation of the state of the teeth included the number of sound teeth, the number of caries teeth, dental caries experience and the number of filling teeth. The following results were obtained. First, women lacked the management on plaque and had more caries teeth compared with men. In terms of impairment classification, subjects with both hearing and language impairment lacked the management on plaque and had more caries teeth. Second, subjects who did not get an oral exam for one year had more caries teeth. Oral hygiene score was the highest with the brushing time for 3-4 minutes. The number of sound teeth was increased as the brushing time was increased. In addition, the oral hygiene management time was the highest when cleaning the teeth, gums and tongue at the same time. Third, it was shown that the satisfaction of oral health education by using the new equipment was high. As a result of this study, in order to improve the oral health level of impaired students, they shall be trained to manage their teeth by themselves and educated to increase their motivation and practice. Thus, it is thought that various approaches which are differentiated from existing methods are required to be tried.

• Journal of the korean academy of Pediatric Dentistry
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• v.34 no.3
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• pp.370-382
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• 2007

The aims of this study were to compare the status of dental caries between mental retarded persons(MR) and normal persons and investigated the association among dental caries and oral factors(plaque index, S. mutans, Lactobacillus, buffering capacity, salivary total IgA and anti-S. mutans IgA titers). DMFS index and plaque index were significantly greater in the MR person group than in the normal person group. The concentration of S. mutans-specific IgA was significantly greater in the normal person group than in the MR person group, but that of salivary total IgA was not show the significant difference. Salivary buffering capacity was significantly greater in the normal person group than in the MR person group, but the counts of salivary S. mutans and Lactobacillus were not significantly different. By age group(I: 9-11Y, II: 12-14Y, III: 15-18Y), DMFS index and plaque index were significantly greater in the MR person group than in the normal person group at III. The S. mutans counts and Lactobacillus counts were significantly greater in the normal person group than in the MR person group at I, but those were contrary at II, III. There was a high correlation among caries index and buffering capacity, level of S. mutans and Lactobacillus, plaque index at III.

• Journal of dental hygiene science
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• v.13 no.4
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• pp.403-409
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• 2013

The purpose of this study was to evaluate the correlation between caries experience, Quantitative Light-Induced Fluorescence-Digital (QLF-D) redings and new caries activity test (Cariview) results in preschool children. Fifty-seven healthy kindergarten children (male 28, female 29) were participated this study. The calibrated dentist investigated the caries experience of children and new caries activity test. Cariview samples were incubated in the activated medium at $37^{\circ}C$ for 48 hours. All QLF-D taking and readings were performed by one experienced and trained operator under identical conditions in a dental unit chair located in a darkened room. Analysis range was limited to the maxillary and mandibular anterior teeth. QLF-D redings (white spot and dental plaque) were analysed using QLF system. The dft index had a relatively high correlation with the QLF-D redings (white spot: r=0.617, simple plaque score: r=0.500) (p<0.01). Also, there was significant correlation between dft index and the Cariview score (r=0.286) (p<0.05). However, the Cariview score had no significant correlation between dt index and ft index (p>0.05). QLF-D can be evaluated objectively the initial caries lesions and dental plaque correlated with caries experience. Therefore, QLF-D will be useful to the study of caries prediction.

• The Journal of the Korean dental association
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• v.10 no.1
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• pp.53-57
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• 1972

저자는 임상적 진단과 치수내 혈액상과이 관계를 규명하기 위하여 치아 우식증에 의하여 심부로 이환된 이십개의 치아를 선택하여 치수절단술을 시행한 후 기 혈액을 검토한 결과 다음과 같은 결론을 얻었다. 1. 임상적으로 치수충혈로 전단된 일곱 개의 치아중, 세 개의 혈액표본을 정상 혈액상을 나타냈고 두개의 혈액표본은 약간의 급성 염증상을 나타냈으나 나머지 두개의 혈액표본은 심한 만성 염증상을 나타냈다. 2. 임상적으로 급성치수염으로 진단된 열세개의 치아중, 열개의 혈액표본은 심한 만성 염증상을 나타냈고 한 개의 혈액표본은 약간의 만성 염증상을 나타냈으며 나머지 두개의 혈액 표본은 급성 염증상을 나타냈다.

• Journal of agricultural medicine and community health
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• v.45 no.2
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• pp.79-88
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• 2020

연구목적: 이 연구는 지역사회 치면열구전색 사업의 치아우식 예방효과를 평가하고자 시행되었다. 연구방법: 연구 대상자는 2005년부터 2008년까지 김천시에 소재한 34개 초등학교에 재학 중인 9,001명 중 2005년 최초 구강검사 당시 상·하악 제1대구치에 치아우식이 없는 치아와 학생 4,768명을 최종 대상자로 선정하였다. 2005년도에 치면열구전색을 실시한 1,478명에 대해 3년간 추적조사가 이루어졌고, 2006년에 치면열구전색을 실시한 999명에 대해 2년간 추적조사를 하였으며, 2007년에 치면열구전색을 실시한 458명에 대해 1년간 추적조사 후 기술통계 및 교차분석을 시행하였다. 연구결과: 치면열구전색 실시군의 DMFT rate는 1년 추적 후 1.4%에서 3년 추적 후 4.1%, DMFT index는 1년 추적 후 0.18개에서 3년 추적 후 0.70개로 추적기간이 길어질수록 높게 나타났다. 1일 평균 칫솔질 횟수는 DMFT rate와 DMFT index에 영향을 미쳤다. 즉 치면열구전색을 실시한 대상자라도 1일 평균 칫솔질 횟수가 적으면 DMFT rate와 DMFT index는 높게 나타났다. 결론: 치면열구전색을 실시한 대상자에서도 올바른 칫솔질에 대한 구강보건교육이 선행되어야 한다.

• Restorative Dentistry and Endodontics
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• v.30 no.3
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• pp.149-157
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• 2005

Mechanical removals in decayed teeth have been performed using drill and sharp hand instruments. These methods have some disadvantages such as pain, local anesthesia and overextended cavities Therefore chemo-mechanical excavation of dentin carious lesions has been introduced. The purpose of this study was to evaluate the efficacy of traditional mechanical methods using burs and chemo-mechanical methods (Carisolv) of caries dentin. Mechanical caries removal was carried with low speed round bur Chemo-mechanical caries excavation was performed with Carisolv (Medi-team), using the Carisolv hand instruments. The mean time to remove caries with two different methods was evaluated and the data analyzed with SPSS software (ver 11.5) by t-test (p < 0.05). For histomorphometry of caries removal were also carried with mechanical or chemo-mechanical (Carisolv) methods from 20 extracted caries permanent molars. Complete caries removal was verified with a $\#$23 sharp explorers, Caries Detector (Kuraray Co. Japan), and standard apical radiography. 1. Chemo-mechanical method was taken more times than mechanical method (1.5 fold) (p < 0.05) 2. Excavation for caries took more time for molar lesion than premolar lesion, and the least time was taken to remove the caries in incisor lesion (p < 0.05). 3. There were no significant differences to remove the caries between the maxilla and mandible (p > 0.05). 4. The remaining carious dentin was detected after the ckemo-mechanical removal of the carious dentin, and no smear layer were seen after the mechanical and chemo-mechanical removal of the carious dentin.

• Journal of dental hygiene science
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• v.7 no.4
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• pp.271-274
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• 2007

The purposes of this study were to understand the oral health promotion behavior and dental health condition of primary school children and to examine the relationships between the two variables. For that purpose, 729 fifth and sixth graders from four primary school located in Seoul were surveyed. In addition to the survey responses, dental examination results were used for analysis. The findings were as follows: 1. The children scored 3.51 out of full 5 points in oral health promotion behavior. they scored the highest at 3.82 in dietary habits, which were followed by going to a dentist for prevention purposes at 3.43, the method and frequency of brushing teeth at 3.40 and the use of fluorine at 3.39. 2. It turned out that 46.9% of the children had decayed permanent teeth. The number of decayed teeth was $1.66{\pm}2.32$, that of missing teeth was $0.03{\pm}0.24$. 3. There were reverse correlations(r = -0.32) between the children's subjective perception of their dental health condition and decayed teeth. The more positive perceptions they had for their own dental health condition, the less decayed teeth they had(p < 0.01). 4. There were also reverse correlations(r = -0.10) between the children's oral health promotion behavior and decayed teeth. The more they were engaged in Behavior of alimentation, the less decayed teeth they had(p < 0.01). The results indicate that primary school children can keep their dental health by practicing the right oral health promotion behavior, which calls for a need to develop and apply dental health education programs to promote the oral health promotion behavior among primary school children.

• Journal of the korean academy of Pediatric Dentistry
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• v.32 no.4
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• pp.611-619
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• 2005

The aim of this study was to apply the quantitative light-induced fluorescence(QLF) and use of fluorescein-enhanced QLF method for quantitative assessment of early enamel demineralization in vitro, comparing effectiveness of light sources : argon laser, halogen lamp, light emitting diode (LED) and plasma arc lamp. Sixty extracted teeth were used, prepared by gentle pumicing and coating in an acid-resistant nail-varnish, except for an exposure to a demineralizing solution. Teeth were removed at regular intervals (24, 48 and 72hrs), air-dried and QLF image were taken. Mineral loss, as measured by difference of optical density, was recorded. For dyeenhanced QLF a 0.075% sodium fluorescein dye was applied after QLF examination and mineral loss was recorded. The following result were obtained : 1. Comparing with mean difference of optical density, plasma arc lamp was higher than other light sources in all group (p<0.05). 2. Comparing each group with mean difference of optical density, there was significant different using plasma are lamp and halogen lamp. 3. For use of dye-enhanced QLF, comparing with mean difference of optical density, plasma arc lamp were higher than other light sources in all group(p<0.05). 4. With this model dye-enhanced QLF compared with QLF in optical density, dye-enhanced QLF was higher than QLF in optical density. From the results presented in this paper, it was concluded that plasma light source was more effective compared with other light source for the detection and the quantification of early enamel caries.