• 한국치위생학회지
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• 제1권2호
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• pp.201-211
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• 2001

Dental caries causes the majority of tooth loss among Koreans. Korea is experiencing an increase in dental caries. And it shows a high prevalence of caries in preschool children, which contrasted with the much-improved situation in developed countries. So, it is important to control caries from preschool periods in Korea. Recently, inspections of the teeth of preschool children for evidence of dental disease became a legislative duty in Korea following Oral Health Act(2000). But, standardized oral health programs in preschool children is not yet proposed. Therefore, it is necessary to develop an community based oral health program in preschool children. The purpose of this study was to obtain basic data for the development of community based oral health program in preschool children of Sungnam city. Oral health status in primary dentition were surveyed in 862 2-6 year-old preschool children of Sungnam city by WHO criteria. From the data, df rate, percentage of preschool child ren with active caries, dft index, dt rate, percentage of preschool children with pit and fissure sealant of each age were calculated, and discussed. The obtained results were as follows : 1. The experience of dental caries in primary dentition showed a tendency to increase quickly between 2 and 3 year old children. So, the oral health program in preschool children should be developed to prevent dental caries and control their oral health under three years of age. 2. In 5 year-old children, the percentage with active caries was 60.8% and dft index was 5.06. The dt rate showed a tendency to decrease as proportion to age, but even though 6 year-old children, the dt rate was 47.7%. Therefore, the annual screening dental examination and oral health education programs at the institution for preschool children should be developed to detect and treat dental caries in primary dentition at early stage. 3. The percentage of preschool children with pit and fissure sealant at six years of age was 10.2%. So, pit and fissure sealant and professional fluoride application programs in Public Health Center should be developed to prevent dental caries. 4. Also, it is necessary to establish oral health goals in preschool children and develop water fluoridation program 10 improve and preserve oral health of preschool children in Seongnam city, effectively.

• 대한소아치과학회지
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• 제43권4호
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• pp.347-353
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• 2016

본 연구의 목적은 S-PRG 필러를 포함하는 치면열구전색제(BeautiSealant)의 법랑질 전단결합강도 및 미세누출을 평가함에 있다. 45개의 소구치를 실험대상으로 사용하였으며, 자가부식 프라이머 도포 후 BeautiSealant를 적용한 군(SEPBS), 인산 부식 후 BeautiSealant를 적용한 군(AEBS), 인산 부식 후 $Clinpro^{TM}$ sealant를 적용한 군(AECP)으로 나누어 실험하였다. 전단결합강도 측정을 위해 치면열구전색제 블록을 법랑질 표면에 적용하였고, 미세누출을 평가하기 위해 소구치의 소와열구에 치면열구전색제를 도포하였다. 전단결합강도와 관련하여 SEPBS군은 AEBS, AECP군에 비해 유의하게 낮은 값을 보였으나(p < 0.05), AEBS군과 AECP군 사이에는 통계적으로 유의한 차이가 존재하지 않았다. 미세누출과 관련하여 3군 사이에 통계적으로 유의한 차이가 존재하지 않았다.

• 한국치위생학회지
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• 제15권1호
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• pp.119-127
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• 2015

Objectives: The purpose of the study is to investigate the relationship between dental caries and oral health behaviors in middle and high school students by web-based survey of the ninth(2013) Korean youth risk behavior. Methods: The subjects were 75,149 students from 400 middle schools and 400 high schools. Finally, the survey participation rate was 96.4%(72,435 students from 799 schools) by complex sample design. The questionnaire consisted of general characteristics of the subjects, oral health behaviors, and oral health status. General characteristics included gender, types of schools, economic condition, and residential types. Oral health behaviors included subjective oral health condition, frequency of tooth brushing, tooth brushing after meal within recent 7 days, sealant within 12 months, fluoride application within 12 months, scaling within 12 months, and oral health education experience within 12 months. Oral health condition included dental caries incidence within 12 months. Results: Oral health behavior influenced on dental caries in the middle and high school students in Korea. This study showed the relationship between the sociodemographic characteristics, tooth brushing frequency, sealant experience, dental caries and halitosis experience, and scaling within 12 months. Scaling is the best prevention method for dental caries and halitosis in the students. Conclusions: The study showed the necessity for practical oral health education and the effect of fluoride application for dental caries prevention.

• 대한소아치과학회지
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• 제24권2호
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• pp.460-474
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• 1997

The purpose of this study was to evaluate and compare the effectiveness of various low-viscosity resin systems used as rebonding agents to prevent microleakage at the margins of class I composite resin restorations. Seventy sound human premolars were selected for experiment. Class I cavities were prepared and each cavity was conditioned with a 37% phosphoric acid for 15 sec, rinsed with water for 15 sec, and dried with compressed air. Bonding agent(Scotchbond Multipurpose, 3M Co.) was applied and a hybrid composite resin (Z-100, 3M Co.) was placed using an incremental technic. The excess cured composite resin was carefully removed with Sof-Lex discs(3M Co.) to expose the original margins of the cavity. The following seven groups were established : group 1 was not rebonded and used as control group ; group 2 was rebonded with a Scotchbond Multipurpose(3M Co.) and finished ; group 3 was rebonded with a Fortify(BISCO) and finished ; group 4 was rebonded with a Concise white sealant(3M Co.) and finished ; group 5 was rebonded with a Concise white sealant(3M Co.) and not finished ; group 6 was rebonded with a P&F sealant(BISCO) and finished; group 7 was rebonded with a P&F sealant(BISCO) and not finished. The specimens were then subjected to 500 thermocycles between 5 & 65 with a 10 see dwell time and immersed in 2% methylene blue dye solution for 24 hours and sectioned with low-speed diamond cutter into two part under water condition. The extent of microleakage at rebonded margins was evaluated microscopically and scored for dye penetration according to the following scale : 0=no dye penetration ; 1=dye penetration to half-way along axial wall between enamel surface and DEJ ; 2=dye penetration beyond halfway along axial wall between enamel surface and DEJ ; 3=dye penetration to the full depth of DEJ or beyond DEJ. Selected samples were prepared for SEM observation to determine the depth of penetration of the rebonding agent into the marginal interface. The obtained results were as follows: 1. In the group 2 and 3, which is rebonded with a Scotchbond Multipupose and Fortify, dye penetration score were decreased significantly than that of group 1 (P<0.05), but group 4 and 6 were not statistically different from group 1(P>0.05). 2. There were significant differences between group 4, 6 and group 5, 7 when compared by dye penetration score (P<0.05). 3. In the SEM observation, Scotchbond Multipurpose and Fortify were penetrated within $30-40{\mu}m$ depth of the outermost surface. However, both sealants were failed to penetrate into the debonded interface.

• 한국치위생학회지
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• 제11권6호
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• pp.1005-1016
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• 2011

Objectives : The purpose of this study was to examine the awareness of mothers on their children's oral health and their concern for that by socio-demographic characteristics and the relationship of their awareness of methods of dental-caries prevention to their practice of the methods. Methods : The subjects in this study were 337 guardians of preschoolers at kindergartens and daycare centers. A self-administered survey was conducted from April 25 to May 27, 2011, and the collected data were analyzed by the statistical package SPSS 18.0. Results : 1.Self-rated concern for children's oral health, 87.7 percent and 12.1 percent replied, "So-so." Whether they were working or not and whether they were mainly responsible for child rearing made significant differences to that(p<.05). 2. As to subjective awareness of their children's oral health, the largest group of the mothers answered "So-so." (44.9%) The second replied that their children were in good oral health(40.5%), and the third group in poor oral health(14.2%). 3. The relationship between self-rated concern for their children's oral health and awareness of methods of caries prevention, statistically significant differences were found according to toothbrushing education and sealant(p<.05). There were no statistically significant differences in practice, but application of fluoride was the least. 4. The relationship between self-rated awareness for their children's oral health and awareness of the preventive methods of caries, there were statistically significant gaps in awareness of toothbrushing education(p<.05). In practice, statistically significant gaps were found in practice of toothbrushing education and sugar-intake restriction(p<.01). 5. In regard to the correlation between awareness and practice of the preventive methods of caries, awareness of all the factors involving toothbrushing education, sealant, application of fluoride and restriction of sugar intake had a significant positive correlation to practice of them. Better awareness led to better practice. Conclusions : In order to ensure children's successful oral health care, more authentic education of how to prevent dental caries should be offered by experts such as dental hygienists and dentists. Especially, detailed information on application of fluoride, restriction of sugar intake and pit and sealant should be provided for mothers to help their children to stay away from dental caries.

• Restorative Dentistry and Endodontics
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• 제39권3호
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• pp.180-186
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• 2014

Objectives: The purpose of this in vitro study was to evaluate the microleakage and penetration of fissure sealant in permanent molar teeth with fluorosis after pretreatment of the occlusal surface. Materials and Methods: A total of 120 third molars with mild dental fluorosis were randomly divided into 6 groups (n = 20). The tooth surfaces were sealed with an unfilled resin fissure sealant (FS) material. The experimental groups included: 1) phosphoric acid etching (AE) + FS (control); 2) AE + One-Step Plus (OS, Bisco) + FS; 3) bur + AE + FS; 4) bur + AE + OS + FS; 5) Er:YAG laser + AE + FS; and 6) Er:YAG laser + AE + OS + FS. After thermocycling, the teeth were immersed in 0.5% fuchsin and sectioned. Proportions of mircoleakage (PM) and unfilled area (PUA) were measured by digital microscope. Results: Overall, there were significant differences among all groups in the PM (p = 0.00). Group 3 showed the greatest PM, and was significantly different from groups 2 to 6 (p < 0.05). Group 6 showed the lowest PM. Pretreatment with Er:YAG with or without adhesive led to less PM than bur pretreatment. There were no significant differences among groups in PUA. Conclusions: Conventional acid etching provided a similar degree of occlusal seal in teeth with fluorosis compared to those pretreated with a bur or Er:YAG laser. Pretreatment of pits and fissures with Er:YAG in teeth with fluorosis may be an alternative method before fissure sealant application.

• Restorative Dentistry and Endodontics
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• 제45권1호
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• pp.12.1-12.8
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• 2020

Objectives: The aim of this in vitro study was to evaluate the microhardness and surface roughness of composite resins before and after tooth bleaching procedures. Materials and Methods: Sixty specimens were prepared of each composite resin (Filtek Supreme XT and Opallis), and BisCover LV surface sealant was applied to half of the specimens. Thirty enamel samples were obtained from the buccal and lingual surfaces of human molars for use as the control group. The surface roughness and microhardness were measured before and after bleaching procedures with 35% hydrogen peroxide or 16% carbamide (n = 10). Data were analyzed using 1-way analysis of variance and the Fisher test (α = 0.05). Results: Neither hydrogen peroxide nor carbamide peroxide treatment significantly altered the hardness of the composite resins, regardless of surface sealant application; however, both treatments significantly decreased the hardness of the tooth samples (p < 0.05). The bleaching did not cause any change in surface roughness, with the exception of the unsealed Opallis composite resin and dental enamel, both of which displayed an increase in surface roughness after bleaching with carbamide peroxide (p < 0.05). Conclusions: The microhardness and surface roughness of enamel and Opallis composite resin were influenced by bleaching procedures.

• 한국치위생학회지
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• 제16권6호
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• pp.849-861
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• 2016

Objectives: The purpose of the study was to investigate the relationships among snack habits, oral health practice, and oral health status in preschool children. Methods: The subjects were 209 preschool children and their mothers in Jeonbuk from March 24 to May 30, 2014. The study instruments comprised snack habits, oral health practice, and oral health status. Data were analyzed for independent t-test, one way ANOVA and hierarchical multiple regression using SPSS Win 21.0 version. Results: Higher dft index was shown in the older age (p=0.033), lower mother's education (p<0.001), lower mother's daily toothbrushing (p<0.001), check-up after tooth-brushing (p<0.001), tooth-brushing practice before sleeping (p<0.001), tooth-brushing practice after snack (p<0.001), regular dental check-up (p<0.001), fluoride and sealant for prevention caries (p<0.001), limitation of sugar snack intake (p<0.007), periodic replacement toothbrush (p=0.022). The cause of higher dft index included soda (p<0.001), yogurt (p<0.001), snack (p=0.002), bread and cake (p=0.002) and caramel and candy (p<0.001). Fruit (p<0.001), vegetable (p<0.001) and milk (p=0.004) decreased dft index. Factors affecting oral health status were tooth-brushing practice before sleeping, tooth-brushing practice after snack, regular dental check-up, fluoride and sealant for prevention caries, and intake of soda, yogurt, caramel, candy, and fruit. The explanation power of the final model was 67.6%. Conclusions: It is necessary to develop the oral health education program for the preschool children and mothers to enhance the best oral health condition.

• 대한소아치과학회지
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• 제36권3호
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• pp.440-447
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• 2009

본 연구는 예방적 레진 수복술에 전통적으로 사용되던 소와열구 전색제를 대신하여, 유동성 복합 레진이 사용될 경우의 타당성을 검토하기 위해 시행되었다. 비커스 미세경도를 측정하기 위해 직경 10 mm, 높이 3 mm인 11개의 시편을 제작하여 비커스 미세경도 측정기(FM-7, FUTURE-TEC Inc., Japan)를 이용하여 압입하중 50 gf, 유지시간 15초의 조건 하에서 측정하여 각 군의 평균값을 산출하였다. 표면조도를 측정하기 위해 칫솔마모시험기(Toothbrush abrasive machine K236, Tokyo Machine Co., Japan)로 4개의 시편 표면에 200 rpm의 속도로 4000회의 칫솔질을 시행한 뒤 표면조도형상측정기(Form Talysurf series 2, Rank Taylor Hobson Co., England)를 이용해 표면조도를 측정하였다. ${\alpha}$=0.05의 유의 수준에서 Kruskal-Wallis rank test와 Mann-Whitney U test를 사용하였다. 또한 주사전자현미경으로 관찰하여 각 군의 마모 양상을 비교하여 다음과 같은 결론을 얻었다. 1. 비커스 미세경도 측정 결과 Filtek Z350 flowable (3M ESPE, U.S.A), Palfique Estelite LV (Tokuyama Dental, Japan), Ultraseal XT plus (Ultradent, U.S.A) 순으로 높게 나타났으며 모든 군 간에 통계적으로 유의한 차이가 있었다(p<0.0001). 2. 표면 조도 측정 결과, $Ultraseal^{(R)}$, $Estelite^{(R)}$, $Z350^{(R)}$ 순으로 높게 나타났으나 통계적으로 유의한 차이는 없었다(p=0.116). 3. 마모되지 않은 표면과 마모가 일어난 표면을 주사전자현미경으로 관찰한 결과, 전색제인 Ultraseal XT plus와 유동성 복합레진인 Palfique Estelite LV, 나노필러를 함유한 유동성 복합레진인 Filtek Z350 flowable이 서로 다른 마모 양상이 나타나는 것을 볼 수 있었다. 이상의 결과를 토대로 할 때, 유동성 복합 레진이 전색제에 비해 물성 적 측면에서 더 우수한 것으로 나타났다.

• 치위생과학회지
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• 제5권2호
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• pp.89-95
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• 2005

Dental caries is the most prevalent dental issue of childhood. So it is important to control caries form 5 years children and above all, the study of oral health status have been preceding for preventive dental caries. The purpose of this study was to assess the oral health status of 5 years children in seongnam city. The study population consisted of 1035 kindergraten children which had been selected stratified random sampling. The survey is based on WHO, 2000 oral health assessment, which has been modified. From data dt index, ft index, dft index, dt rate, ft rate, percentage of active caries, percentage of pit and fissure sealant, and so on. The findings were as follows: (1) In 5 years children, the experience of dental caries was 73.0% and the percentage with active caries was 49.4%. Dmf index was 4.13 and this observation shows a statistical singnificance. (2) Average number of 5 years children the experience of dental caries surface index was 3.11 and dfts index was 8.91. (3) The experience of dental caries fo the frist molar was 1.9% and the percentage with active caries was 1.1%. Otherwise the percentage of pit and fissure sealant of the first molar was 6.7%. It is show the low percentage for preventive dental caries. (4) Shows percentage of teeth needing treatment for one surface and above two surface was each 27.3%, 34.0%. And percentage of children required single crown and pulp treatment & single crown and tooth extraction was each 3.8%, 4.7%, 3.3%. (5) Soojung-gu and jungwon-gu were having poor oral hygiene as compared to bundang-gu. So it is necessary to establish community oral health program effectively. And for preventive dental caries and early diagnosis and early treatment consider with community characteristic.