• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.10a
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• pp.23-23
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• 2003

• Journal of Periodontal and Implant Science
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• v.13 no.1
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• pp.62.1-62.1
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• 1983

• Journal of Korean society of Dental Hygiene
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• v.15 no.3
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• pp.399-410
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• 2015

Objectives: The purpose of the study is to investigate the influencing factors of metabolic syndrome on the periodontal disease in the Korean adults over 40 years old. Methods: The data were extracted from the Fifth National Health Nutrition Survey 2010. The subjects were adults over 40 years old. The periodontal diseases were examined by direct survey. The questionnaire consisted of the general characteristics of the subjects, oral health behavior, metabolic syndrome, and relation to periodontal diseases. CPI(community periodontal index) was measured. CPI indicates periodontal condition and classified into alveolar arch of the upper jaw and the lower jaw. A periodontal disease is defined as $CPI{\geq}3$(over 4 mm). The variables for metabolic diseases included hypertension, diabetes mellitus, dyslipidemia, and obesity measured as BMI. Results: Diabetes mellitus is closely related to periodontal diseases prevalence. Low level of HDL increase the periodontal diseases. Number of toothbrushung, use of dental floss and interdental toothbrush as for the number of toothbrushing, more than twice toothbrushing a day, and use of dental floss and interdental toothbrush reduced periodontal diseases. Conclusions: The risk factors of periodontal disease in Korean adults over 40 years old were sex, age, residence, monthly income, education level, smoking, diabetes and low HDL cholesterol.

• The Korean Journal of Health Service Management
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• v.7 no.4
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• pp.1-12
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• 2013

This study is to analyze the personality trait and dental fear of high school students. This study is conducted with a total of 603 first grader at high school in DaeGu city from 1st September to 30th October, 2009. In prevention and dental treatment knowledge category, the average score of female are higher than male. The concern of oral health, the experience of oral health education and the number of toothbrush are significantly different in the knowledge category. In dental fear category, the number of dental pain, the visiting is treatment, the recognize of dental state, the number of toothbrush and the change of dental visiting date are significantly different. In the prevention knowledge according to dental fear state, low fear group 7.03 is higher than high fear group. In the dental treatment knowledge according to dental fear state, high fear group 7.15 is higher than low fear group. In personal temperament, there are not significantly relationship between prevention knowledge, dental treatment knowledge and dental fear. These findings are basis to development of education programs which were included prevention and dental treatment knowledge before visiting dental clinics for reducing dental fear.

• Journal of Korean society of Dental Hygiene
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• v.2 no.2
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• pp.159-173
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• 2002

The 180 toothbrushes out of 18 models( ten brushes for each model) were used for this examination among the toothbrushes for adults which were sold in the domestic markets. After three-month brushings through a roll ing method and Bass method were practiced with Toothbrush Stroke Tester which reproduced brushing methods outside the mouth, I investigated the morphology bristle tips of using scanning electron microscope(SEM). The conclusions are as follows. 1. Soft bristle toothbrushes(of 8 models out of 9 models) were badly damaged at the bristles end after 3 month toothbrushing. 2. Medium bristle toothbrushes(of four models out of five models) were irregularly worn at the bristles end after 3 month toothbrushing. 3. Hard bristle toothbrushes(of three models out of four models) were chisel-shapedly worn at the bristles end after 3 month toothbrushing. 4. Taper-shaped toothbrushes were very irregularly bent at the bristles end after 3 month toothbrushing. 5. It was examined in the bristle stiffness that soft bristle toothbrushes were found in 9 models(50.00%), medium bristle toothbrushes in 5 models(27.78%), and hard-bristle toothbrushes in 4 models(22.22%).

• Journal of Korean society of Dental Hygiene
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• v.21 no.2
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• pp.99-107
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• 2021

Objectives: To compare and evaluate the degree of abrasion of the denture base resin according to the type of denture cleansers. Methods: Denture base resin specimens were prepared and dried. The resin specimens were installed in the automatic brushing machine so that the toothbrush weighed 200 g. The brushing was performed 1,000 times each, a total of 10,000 times using (1) distilled water (DW), (2) non-abrasive cleanser (NAC), and (3) toothpaste (TP), respectively. Thirty specimens were allocated for each group. The thickness of abrasion by brushing was calculated by converting the weight of the specimen. Results: In all DW, NAC, and TP groups, significant differences were found in the average amount of abrasion of the resin specimen due to 1,000 to 10,000 brushings (p<0.001). The average abrasion amount of the resin specimen due to brushing 10,000 times was 2.31±1.20 ㎛ in DW group, 2.52±0.25 ㎛ in NAC group, 6.50±0.60 ㎛ in TP group, and the amount of abrasion in the TP group was statistically significant compared to other groups (p<0.001). Conclusions: The use of TP is not recommended as a method for maintaining the longevity of dentures and for oral health, and NAC was considered to be possible to be used as a denture cleanser because it had a similar amount of abrasion of that of DW.

• Journal of dental hygiene science
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• v.8 no.2
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• pp.103-107
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• 2008

The purpose of this study is to compare the amount of dentifrice used in general by the subjects with the amount of dentifrice both by Pea-size and by sideways application(transverse technique) after the subjects of dental hygiene students applied dentifrice on the toothbrushes for kids. The amount of dentifrice was calculated by the weight differences between toothbrush itself and toothbrush with dentifrice on it after toothbrushes for children were allotted to subjects. For the first measurement, the subjects were told to apply out the amount of dentifrice considered proper for children when they brush their teeth. For the second one, they were told to apply out the amount of Pea-size dentifrice recommended to children. Finally, the subjects had to applied dentifrice out on their toothbrush in the sideways or transverse technique after they were taught the way to applied dentifrice out. In this experiment, the average amount of dentifrice per usage when he or she brush his or her teeth as usual was 0.40 g, and the average amount of dentifrice applied to Pea-size application was 0.43 g, and the average amount of dentifrice applied to Transverse technique application was 0.26 g. Transverse technique not only can be easy to show and teach the way to both children and their parents, but also can be recommendable to children because it can minimize fluoride intake carelessly.

• The Journal of Korean Academy of Prosthodontics
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• v.33 no.2
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• pp.210-230
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• 1995

To compare the wear resistance of four kinds of commercial acrylic resin teeth [SR-Orthosit PosterioresR(Ivoclar Co., Liechtenstein), Endura PosteriorR(Shofu Inc. Japan), trubyte IPN teethR(Dentsply International Inc., York,), Trubyte BiotoneR(dentsply Inermational Inc. Brazil) by means of the toothbrush abrasion method, the artificial resin teeth were embedded in epoxy resin with the occlusal surfaces aligned in one plane for a total of 40 blocks. There after, each lock was mounted in the arm of the toothbrush abrasion machine(K 236, Japan). Wear measurements were made on the three preconditioned states. Those were as follows : no treatment specimens, thermocycled specimens, and thermocycled specimens which were immeresed applied load of 400g during the buring the brushing cycle. At the end of the 30,000-stroke cycle, each specimen was removed, and weighed. The microhardness of four kinds of commercial resin teeth were determined by means of microhardness tester. Microhardness tests were performed on te no treatment specimens, thermocycled specimens, and thermocycled specimens with immersion in the denture cleansing solution. Finally, the comparison of thermal properties were perfomed using differential scanning calorimeter(DSC-1500). The following results were obtained : 1. In the case of no treatment teeth, the wear amount of endura Posterior(EN) was the greatest among the others(p<0.01), and the wear amount of three kinds of artificial resin teeth was increased in the order of Trubyte IPN teeth(IN), Trubyte Biotone(BN), SR-Orthosit Posteriores(SN) but there was no statistic significance(p>0.01). 2. The wear amount of Trubyte IPN teeth(IT) and Trubyte Biotone(BT), was increased due to thermocycling effect, but that of Endura Posteriores(ET) was decreased conversely(p<0.01). 3. Except for the SR-Orthosit Posteriores(STC), the wear amount of three kinds of artificial resing teeth(that is, ETC, ITC, BTC) was increased due to denture cleansing solution$(Cledent^R)$, but there was no statistic significance(p>0.01). But the wear amount of the SR-Orthosit Posteriores(STC) was the greatest among the others(p<0.01). 4. The wear amount of toothbrush was the greatest in case of contact with occlusal surface of SROrthosit Posteriores resin teeth(p<0.01). 5. the microhardness values(KHN) of the SR-Orthosit Posteriores was the highest among the experimental artificial resin teeth(p<0.01). 6. There was no relationship between microhardness valuse(KHN) and wear amount of four kinds of experimental artificial resin teeth(p<0.01). 7. The differential canning calorimetric property of four kinds of artificial resin teeth did not show endothermal or exothermal peak in the range of $100^{\circ}C$

• Journal of Korean society of Dental Hygiene
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• v.1 no.1
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• pp.39-51
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• 2001

This study was performed to collect basic data for the development of effective oral health education program of lower graders in elementary school. The subject in this study were 704 first-year, second-year and third-year in Hyoje elementary school. The authors collected the tissue where dental caries involved. the possibilities of dental caries prevention. cariogenic food and noncariogenic food. time and frequency of toothbrushing. size of using toothbrush, intake frequency of cariogenic food and the experience with visiting dental clinics, the purpose of visiting dental clinics and fear for dental treatment. The collected data were analyzed. The finding of this study were as follows: 1. Twenty-four percent of students had not correct understanding about the tissue which dental caries are involved. Eleven percent of students thought that it was impossible to prevent dental caries. 2. Sixty-four percent of student brushed their teeth before going to bed, and 63.0% of responded students brushed their teeth twice or more a day. Seventy-eight percent of students used small toothbrush. and there was a Significant difference of size of using toothbrush among the first, second and third graders(P<0.01). Sixty-nine percent of students intake cariogenic food once or more a day. 3. Eighty-six percent of students had experienced with visiting denial clinics. sixty-two percent of students visited dental clinics when they had a toothache. and there was a significant difference of the purpose of visiting dental clinics among the first. second and third graders(P<0.01). Seventeen percent of students responded that dental treatment is fearful there was a significant difference of fear for denial treatment among the first, second and third graders(P<0.05). 4. It was recommended that effective oral health education programs should be developed to increase toothbrushing after breakfast, to decrease intake frequency of cariogenic food, to increase frequency of visiting dental clinics regularly, and to reduced fear for dental treatment.

• Journal of the korean academy of Pediatric Dentistry
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• v.28 no.1
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• pp.118-128
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• 2001

This study was performed to evaluate the toothbrush abrasion characteristics of seven commercially available light-cured cervical restorative materials one resin-modified glass-ionomer material(Fuji II LC) three polyacid-modified composites(Compoglass, Dyract, F2000), and three light-cured composites(Heliomolar, Palpique Estelite, UniFil F). All samples were stored in distilled water at $37^{\circ}C$ for 10 days. 2.0N of weight was loaded during the test and the abraded surfaces were examined with profilometer and SEM after 100,000 cycles. The results obtained were summarized as follows; 1. The highest hardness value of 79.7 was observed in the FT group and the lowest value of 20.0 was observed in the HM group. Results of Tukey test showed that an overall significant difference was indicated except the CG and DR groups(p<0.05). 2. The highest surface roughness was observed in the FL group and the lowest was observed in the UF group. Results of Tukey test showed the significant difference between the FL or FT and UF groups(p<0.05). 3. Statistically higher abrasion and surface roughness were observed for the dentifrice of paste type, Perio A+, than for that of gel paste type, Tom & Jerry. 4. The surface roughness values increased on the abraded surfaces because of the protrusion of filler particles due to selective removal of matrix resin.