The purpose of this study was to utilize it as a basic data for local self-government in each region to plan and perform the oral health program targeting children and mothers as guardian. Data had been obtained by using children's oral examination and mothers' self-reported questionnaire method from June 1 to June 30 in 2007 targeting kindergartens where are located in the region of Hwaseong city. The survey was conducted targeting totally 239 people. Its results are as follows. 1. The healthy-tooth rate in the whole children accounted for 79.12%, thus girls were indicated to be a little higher with 80.36% than boys with 78.13%. Carious-tooth rate showed 8.74% for boys and 6.07% for girls. The dental-caries experience treatment rate showed 11.37% for boys and 12.59% for girls. 2. The index of children at age 5, df rate was 39.3% in the whole, thereby having been indicated that boys with 41.3% are higher than girls with 37.2%. Even dft index is showing the higher index in boys with 3.9 than girls with 3.2. 3. As a result of examining mothers' oral-health behavior, mothers with out employment thought the self oral-health state to be good(p = 0.002). In appearance of scaling experience or of periodic dental checkup, a slight difference is being shown according to general characteristics, but wasn't significant. 4. As a result of examining children's oral management, it was indicated that the higher economic level(p = 0.011) and the more in mothers without employment lead to giving a light meal less(p = 0.41). In appearance of children's periodic dental checkup, the higher academic background level(p = 0.047) and the more employment(p = 0.044) led to receiving dental examination.
Journal of Korean Home Economics Education Association
/
v.17
no.3
s.37
/
pp.53-70
/
2005
This study was to offer a basic data for setting up new curriculum and preparing for effective instruction and education methode on md and nutrition section by researching & analyzing the degree of necessity, difficulty and utilization in actual life of food and nutrition section which requires a close relation with actual life and home economics for the second grade students who studied home economics in the first grade in a middle school. The results obtained were as follows. A highest number of students$(38.9\%)$ responded that 'they learned skills required in home life such as cooking, laundry and childcare' on a question of home economics recognition and the next highest percentage of students$(27.5\%)$ responded' they learned of healthy life and correct human building through home economics education'. For the recognition of a food and nutrition section the highest percentage of students$(38.8\%)$ responded that 'they learned the knowledge and principle of food nutrition for the improvement of a food and nutrition', and the next highest percentage of students$(30.7\%)$ responded 'they teamed practical skills required in actual life'. The meal and nutrition of juvenile, and the principle and practice of cooking was highly ranked in order for the necessity on the food and nutrition section, girl students accounting for higher percentage than boys in overall food and nutrition section and all areas. A nutrition of juvenile, a meal of juvenile, and the principle of cooking and cooking practice was middle ranked in order for the difficulty of the food and nutrition section. Girl students recognized overall food and nutrition section more difficult and also they recognized a nutrition of juvenile and a meal of juvenile more difficult than boy students, but boy students recognized the principle of cooking and cooking practice more difficult than girls. On the practical use of the food and nutrition section in actual life, a meal of juvenile, the principle of cooking and cooking practice, nutrition of juvenile was low ranked in order. Boy students practically used overall food and nutrition section including a meal of juvenile and nutrition of juvenile in detail with high percentage, and girl students practically used the principle of cooking and cooking practice with high percentage. . Regarding interrelation of the degree of necessity, difficultly and utilization on food and nutrition section, as the degree of necessity was high on food and nutrition, the degree of practice was high in all the areas, and as respondents recognized food and nutrition section difficult, they practically used a food and nutrition section at low percentage.
Journal of the korean academy of Pediatric Dentistry
/
v.31
no.1
/
pp.66-78
/
2004
The objective of this study was to apply the vibration technique to reduce the viscosity of bonding adhesives and thereby compare the bond strength and resin penetration in enamel and dentin achieved with those gained using the conventional technique and vibration technique. For enamel specimens, thirty teeth were sectioned mesio-distally. Sectioned two parts were assigned to same adhesive system but different treatment(vibration vs. non-vibration). Each specimen was embedded in 1-inch inner diameter PVC pipe with a acrylic resin. The buccal and lingual surfaces were placed so that the tooth and the embedding medium were at the same level. The samples were subsequently polished silicon carbide abrasive papers. Each adhesive system was applied according to its manufacture's instruction. Vibration groups were additionally vibrated for 15 seconds before curing. For dentin specimen, except removing the coronal part and placing occlusal surface at the mold level, the remaining procedures were same as enamel specimen. Resin composite(Z250. 3M. U.S.A.) was condensed on to the prepared surface in two increments using a mold kit(Ultradent Inc., U.S.A.). Each increments was light cured for 40 seconds. After 24 hours in tap water at room temperature, the specimens were thermocycled for 1000cycles. Shear bond strengths were measured with a universal testing machine(Instron 4465, England). To investigate infiltration patterns of adhesive materials, the surface of specimens was examined with scanning electron microscope. The results were as follows: 1. In enamel the mean values of shear bond strengths in vibration groups(group 2, 4, 6) were greater than those of non-vibration group(group 1, 3, 5). The differences were statistically significant except AQ bond group. 2. In dentin, the mean values of shear bond strengths in vibration groups(group 2, 4, 6) were greater than those of non-vibration groups(group 1, 3, 5). But the differences were not statistically significant except One-Up Bond F group. 3. The vibration group showed more mineral loss in enamel and longer resin tag and greater number of lateral branches in dentin under SEM examination.
Journal of the korean academy of Pediatric Dentistry
/
v.35
no.4
/
pp.619-627
/
2008
The objective of this study was to compare the microleakage of five adhesive systems in the enamel and dentin of permanent teeth. Class V cavity preparations with occlusal margins in enamel and gingival margins in dentin were prepared on both buccal and lingual surfaces of 25 extracted human molar teeth. The tested adhesives were: Adper Scotchbond Multi-purpose Plus Adhesive (SM), Adper Single bond 2 (SB), Clearfil SE Bond (SE), Adper Prompt L-Pop (PL) and G-Bond (GB). The results were as follows: 1. At the enamel margins, PL showed the highest leakage value(0.85), and others showed values of SB(0.55), GB(0.50), SM(0.35) and SE(0.25) in decreasing order. There were statistically significant differences in PL vs. SM and PL vs. SE(p<0.05). 2. At the dentin margins, GB showed the highest leakage value(2.10), and others showed values of SE(1.45), PL(1.40), SB(1.05), SM(0.70) in decreasing order. There were statistically significant differences in GB vs. SB and GB vs. SM(p<0.05). 3. Dentin margins showed high dye penetration rate than enamel margins in all material tested groups and there were statistically significant differences for SE, PL and GB.
Using data from the Korean Labor & Income Panel Study (KLIPS), this study investigates private income transfers in Korea, where adult children have undertaken the most responsibility of supporting their elderly parents without well-established social safety net for the elderly. According to the KLIPS data, three out of five households provided some type of support for their aged parents and two out of five households of the elderly received financial support from their adult children on a regular base. However, the private income transfers in Korea are not enough to alleviate the impact of the fall in the earned income of those who retired and are approaching an age of needing financial assistance from external source. The monthly income of those at least the age of 75, even with the earning of their spouses, is below the staggering amount of 450,000 won, which indicates that the elderly in Korea are at high risk of poverty. In order to analyze microeconomic factors affecting the private income transfers to the elderly parents, the following three samples extracted from the KLIPS data are used: a sample of respondents of age 50 or older with detailed information on their financial status; a five-year household panel sample in which their unobserved family-specific and time-invariant characteristics can be controlled by the fixed-effects model; and a sample of the younger split-off household in which characteristics of both the elderly household and their adult children household can be controlled simultaneously. The results of estimating private income transfer models using these samples can be summarized as follows. First, the dominant motive lies on the children-to-parent altruistic relationship. Additionally, another is based on exchange motive, which is paid to the elderly parents who take care of their grandchildren. Second, the amount of private income transfers has negative correlation with the income of the elderly parents, while being positively correlated with the income of the adult children. However, its income elasticity is not that high. Third, the amount of private income transfers shows a pattern of reaching the highest level when the elderly parents are in the age of 75 years old, following a decreasing pattern thereafter. Fourth, public assistance, such as the National Basic Livelihood Security benefit, appears to crowd out private transfers. Private transfers have fared better than public transfers in alleviating elderly poverty, but the role of public transfers has been increasing rapidly since the welfare expansion after the financial crisis in the late 1990s, so that one of four elderly people depends on public transfers as their main income source in 2003. As of the same year, however, there existed and occupied 12% of the elderly households those who seemed eligible for the National Basic Livelihood benefit but did not receive any public assistance. To remove elderly poverty, government may need to improve welfare delivery system as well as to increase welfare budget for the poor. In the face of persistent elderly poverty and increasing demand for public support for the elderly, which will lead to increasing government debt, welfare policy needs targeting toward the neediest rather than expanding universal benefits that have less effect of income redistribution and heavier cost. Identifying every disadvantaged elderly in dire need for economic support and providing them with the basic livelihood security would be the most important and imminent responsibility that we all should assume to prepare for the growing aged population, and this also should accompany measures to utilize the elderly workforce with enough capability and strong will to work.
The purpose of this study was to evaluate the effects of oral habits on the muscles of mastication and facial expression by means of two parameters: muscle stiffness and elasticity. 10 healthy, fully-dentate male subjects in their twenties were selected for this study; all had normal Class I occlusal relationships. Muscle stiffness and elasticity were measured with a tactile sensor(Venustron, Axiom Co., JAPAN) while subjects were asked to relax and perform various parafunctional activities such unilateral clenching(biting the bite force recorder with a force of 50kg on each subject's preferred side), jaw thrusting and lip bracing. The following muscles were examined: temporalis anterior(Ta), masseter(Mm), frontalis(Fr), inferior orbicularis oculi(OOci), zygomaticus major(Zm), superior and inferior orbularis oris(OOrs and OOri) and mentalis(Mn). Paired t-test, Correlation Coefficients, ANOVA and Multiple Comparison t-tests were used for statistical analysis. Unilateral clenching was highly correlated with bilateral stiffness and elasticity of all the muscles tested. Mm was affected by all three oral habits; Ta was affected by unilateral clenching(p<0.05); Zm was affected by unilateral clenching and OOrs, OOri and Mn were most affected by lip bracing(p<0.05). This study indicates that not only the masticatory muscles but also the muscles of facial expression, mainly circumoral muscles, can be significantly influenced by parafunctional activities such as unilateral clenching and lip bracing.
Park, Chan-Yong;Jeon, Young-Chan;Jeong, Chang-Mo;Yun, Mi-Jung
The Journal of Korean Academy of Prosthodontics
/
v.47
no.1
/
pp.21-28
/
2009
Purpose: The purpose of this study was to compare the wear characteristics of human enamel opposing 2 heat-pressed ceramics (e.max Press and Empress Esthetic), conventional feldspathic porcelain (Ceramco 3) and type III gold alloy. Material and methods: Intact cusps of extracted premolars were used for enamel specimens. Five disk samples were made for each of two heat-pressed ceramics groups, conventional feldspathic porcelain group and type III gold alloy group. Wear tests were conducted in distilled water using a pin-on-disk tribometer. The amount of enamel wear was determined by weighing the enamel specimens before and after wear tests, and the weight was converted to volumes by average density. The wear tracks were analyzed by scanning electron microscopy and surface profilometer to elucidate the wear characteristics. Results: 1. Ceramco 3 led to the greatest amount of enamel wear followed by Empress Esthetic, e.max Press and type III gold alloy. However, there was no significant difference between Ceramco 3 and Empress Esthetic (P>.05), and there were also no significant differences among Empress Esthetic, e.max Press and type III gold alloy (P>.05). 2. The average surface roughness of e.max Press after wear test was smallest followed by Empress Esthetic and Ceramco 3, but there was no significant difference between Empress Esthetic and Ceramco 3 (P>.05). 3. There were no significant differences among the depth of wear tracks of all the groups (P>.05). The group that showed the largest width of wear track was Ceramco 3 followed by Empress Esthetic, e.max Press and type III gold alloy. However, there was no significant difference between e.max Press and Empress Esthetic (P>.05), and there was also no significant difference between Empress Esthetic and Ceramco 3 (P>.05). Conclusion: Within the limits of this study, heat-pressed ceramics were not more abrasive than conventional feldspathic porcelain.
Statement of problem: At present, as the esthetic demands are on the increase, there are many ongoing studies for tooth-colored post and cores. Most of them are about fiber post and prefabricated zirconia post, but few about one-piece milled zirconia post and core using CAD/CAM (computer-aided design/computer-aided manufacturing) technique. Purpose: The objective of this study was to compare microleakage of endodontically treated teeth restored with three different tooth-colored post and cores. Material and methods: Extracted 27 human maxillary incisors were cut at the cementoenamel junction, and the teeth were endodontically treated. Teeth were divided into 3 groups (n=9); restored with fiber post and resin core, prefabricated zirconia post and heat-pressed ceramic core, and CAD/CAM milled zirconia post and core. After the preparation of post space, each post was cemented with dual-polymerized resin cement (Variolink II). Teeth were thermocycled for 1000 cycles between $5-55^{\circ}C$ and dyed in 2% methylene blue at $37^{\circ}C$ for 24 hours. Teeth were sectioned (bucco-lingual), kept the record of microleakage and then image-analyzed using a microscope and computer program. The data were analyzed by one-way ANOVA and Scheffe's multiple range test (${\alpha}=0.05$). Results: All groups showed microleakage and there were no significant differences among the groups (P>.05). Prefabricated zirconia post and heat-pressed ceramic core showed more leakage in dye penetration at the post-tooth margin, but there was little microleakage at the end of the post. Fiber post and resin core group and CAD/CAM milled zirconia post and core group indicated similar microleakage score in each stage. Conclusion: Prefabricated zirconia post and heat-pressed ceramic core group demonstrated better resistance to leakage, and fiber post and resin core group and CAD/CAM milled zirconia post and core group showed the similar patterns. The ANOVA test didn't indicate significant differences in microleakage among test groups. (P>.05)
Journal of the korean academy of Pediatric Dentistry
/
v.28
no.1
/
pp.159-165
/
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).
Journal of the korean academy of Pediatric Dentistry
/
v.30
no.1
/
pp.54-60
/
2003
This study evaluated the influence of chemomechanical caries removal agent $Carisolv^{TM}$(MediTeam, Sweden) for composite resin adhesion to sound human permanent and primary dentin. The buccal/labial surfaces of 80 permanent molars and 80 primary incisors were used. Four types of adhesives and one composite resin were used; AQ Bond(Sun Medical, Japan), Clearfil SE Bond(Kuraray, Japan), Single Bond(3M, USA), Scotchbond Multi-Purpose(3M, USA) and Z100(3M, USA). One drop of $Carisolv^{TM}$(MediTeam, Sweden) was pretreated on the dentin for 0 second(control) and 60 seconds. The specimens were thermocycled for 1,000 times in baths kept 5 degrees C and 55 degrees C with a 30 seconds dwell time. Shear bond strengths were tested and the data was statistically analyzed using one-way ANOVA with subsequent post hoc Scheffe test at p<0.05. $Carisolv^{TM}$ treatment significantly decreased the shear bond strength. Shear bond strength of permanent dentin was significantly higher than that of primary dentin. Clearfil SE Bond treatment groups showed the highest shear bond strength and AQ Bond treatment groups showed the lowest shear bond strength.
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