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This study was conducted to investigate the fluoride release of fluoride-containing restorative materials in fluoride recharging according to the concentration of fluoride toothpaste used in Korea.
Samples of glass ionomer cement, resin-modified glass ionomer cement, alkasite restorative material, and composite resin were prepared and fluoride release was measured on days 1, 3, 7, 14, 21, 28. Thereafter, fluoride-free, 500 ppm, and 1450 ppm fluoride toothpaste was applied to each restorative materials, and the fluoride release was measured on days 1, 3, 7.
Glass ionomer cement showed the highest cumulative fluoride release until the 7th day of measurement, and from the 14th day onwards, the resin-modified glass ionomer cement showed the highest cumulative fluoride release, but there was no significant difference.
When restorative material groups were recharged with 500 ppm of fluoride toothpaste, the fluoride release was significantly higher only for the alkasite restorative material compared to the fluoride-free toothpaste group (p < 0.017). When restorative material groups were recharged with 1450 ppm of fluoride toothpaste, the fluoride release was significantly higher in all restorative groups compared to the fluoride-free toothpaste group (p < 0.017).

PURPOSE: This study aims to examine the relationships among social discrimination, subjective health, and personal satisfaction based on the country of origin. METHODS: The analysis was based on 16,958 immigrants who participated in the National Survey of Multicultural Family 2015 in Korea. This study conducted stratified cross-analysis of social discrimination for the differences in subjective health and personal satisfaction. Multivariate-adjusted odds ratios and 95% confidence intervals for the relationships among social discrimination, subjective health, and personal satisfaction were examined with multivariable logistic regression. RESULTS: There were differences in experience of social discrimination, subjective health status, and personal satisfaction according to the country of origin. Groups without the experience of social discrimination had better subjective health and personal satisfaction than the other groups. CONCLUSION: This study demonstrates that a discrimination prevention program needs to be developed based on a cultural approach.
Diagnostic Self Evaluation* ; Discrimination (Psychology) ; Emigrants and Immigrants* ; Humans ; Korea ; Logistic Models ; Odds Ratio ; Personal Satisfaction* ; Social Discrimination*

OBJECTIVES: The current study aimed to explore the relationship between subjective sleep, emotions, social support and excessive daytime sleepiness (EDS), and extract the strongest predictor of EDS in female undergraduate students. METHODS: Our subjects consisted of 168 female undergraduate students (mean age 21.64±1.66). All participants completed Epworth Sleepiness Scale (ESS), Insomnia Severity Index, Hospital Anxiety and Depression Scale, Social Support Scale, and the Munich Chronotype Questionnaire. RESULTS: There were significant associations between insomnia, anxiety, depression with EDS, but not with subjective total sleep time of workdays and freedays. Also, 23.8% (n=40) of subjects endorsed clinical levels of EDS (ESS>10). Insomnia, anxiety, and depression were higher, and social support was lower in the EDS group compared to the normal group. Finally, we explored factors that influenced EDS, resulting in anxiety and social support being the strongest predictors of EDS. Social support was the strongest predictor of EDS compared to other predictors (β=-0.276, p<0.001). CONCLUSIONS: Results suggest that social support may be important to consider in female undergraduate students who experience EDS.
Anxiety ; Depression ; Female* ; Humans ; Sleep Initiation and Maintenance Disorders

The purpose of this study was to evaluate the accessibility of pediatric dental clinics and quantitatively compare the regions with the best and worst accessibility to pediatric dental clinics in South Korea using the geographic information system. Seoul city showed the highest density of pediatric dental clinics, while Gyeongbuk and Jeonbuk provinces showed the lowest density. Seoul city had a service area ratio of 100% in all districts on a 10 km basis. In Gyeongbuk and Jeonbuk provinces, more than half of the districts had a service area ratio of 0%. In Seoul, the average distance from elementary school to the nearest pediatric dental clinic was 3.45 km. The average distance values were 43.66 km and 40.57 km in Gyeongbuk and Jeonbuk provinces, respectively, which were 12.66 times and 11.76 times longer than the average distance in Seoul city.

Objectives: This study was conducted to investigate the correlation between the individual characteristics of the children and the teeth that had performed pulpectomy for children who visited Wonkwang University Dental Hospital for 5 years and had pulpectomy performed. Methods: Age, sex, number of teeth that had performed pulpectomy and restorative treatment at the time of diagnosis were investigated, and the correlation was statistically analyzed. Results: The number of teeth had performed pulpectomy and number of teeth had performed restorative treatment were statistically significant (P<0.001). There was a statistically significant correlation between the age and sex of the children who had performed pulpectomy and the number of teeth had performed pulpectomy (P<0.05). Conclusions In order to improve children’s oral health, it is considered that there is a need for a new national policy to move up children’s first visit to dental clinic and to allow them to visit continuously.

In dental trauma, reattachment of the original tooth fragment improves the reproduction of original tooth shape, texture, color, and radiolucency; thus, it provides good aesthetics.A 9-year-old boy was referred due to complicated crown-root fracture of the maxillary right central incisor. Although it had poor prognosis due to severe coronal damage and subcrestal fracture, reattachment of the tooth fragment was chosen due to the patient's age. One-visit apexification with mineral trioxide aggregate (MTA) was performed, followed by osteotomy and reattachment of the tooth fragment with post placement.Regular observation revealed no clinical signs or symptoms and no radiologic complications.
Apexification ; Child ; Esthetics ; Humans ; Incisor ; Male ; Miners ; Osteotomy ; Pemetrexed ; Prognosis ; Reproduction ; Tooth

This study aimed to determine whether the curing times of Xtra Power and High Power modes of high-power light emitting diode (LED) curing light are sufficient for polymerization of resin sealants. The specimens were prepared and their microhardness values were measured and compared with those of specimens polymerized under conventional LED curing light.The filled sealant polymerized for 8 seconds in the High Power mode and for 3 seconds in the Xtra Power mode showed significantly lower microhardness than the control specimen (p = 0.000). The unfilled sealant polymerized for 8, 12 seconds in the High Power mode and for 6 seconds in the Xtra Power mode showed significantly lower microhardness than the control specimen (p = 0.000).The results of this study suggest that the short curing time with the Xtra Power and High Power modes of highpower LED curing light are not sufficient for adequate polymerization of sealants under specific conditions, taking into account the curing times and the type of sealant.
Polymerization ; Polymers

The purpose of this study was to investigate the changes of the position of the mental foramen according to age by using panorama of children with mixed and early permanent dentition. 180 panorama of 6 to 13-year-old boys and girls were analyzed and PiView(Infinitt, Korea) program was used.The horizontal position of the mental foramen was evaluated by the relative position of the teeth. The vertical position of the mental foramen was evaluated by the ratios between the distance from the center of the mental foramen to the inferior border of the mandible and the distance from to the alveolar crest to the inferior border of the mandible.The mental foramen was horizontally located in the anterior aspect of the second primary molar(premolar), and vertically slight below the half of mandibular body. As the age increased, it moved to the posterior and the downward and showed a significant correlation with age.
Adolescent ; Child ; Dentition, Permanent ; Female ; Humans ; Mandible ; Tooth

This study aimed to investigate the correlation between maxillary canine's dental maturity and skeletal maturity of growing children. Cephalometric radiographs, hand-wrist radiographs and panoramic radiographs of 299 children aged 6 – 17 years were analyzed to measure the cervical vertebral maturation stages (CVMS), skeletal maturity indicators (SMI) and Demirjian index (DI). Spearman correlation test was used to analyze the correlation between dental maturity and skeletal maturity.There was significant positive correlation between the DI and CVMS in both boys and girls (p = 0.000). Similarly positive correlation was found between the DI and SMI (p = 0.000).The results of this study suggest that the dental maturity of maxillary canine can be used as auxiliary maturity indicator in growing children.
Child ; Female ; Humans