2019, Vol.19, No.2

Journal of Korean society of Dental Hygiene 2023 KCI Impact Factor : 0.8

pISSN : 2287-1705 / eISSN : 2288-2294
https://journal.kci.go.kr/jksdh

Objectives: This study aimed to analyze the correlation between oral function, oral environment, and brain cognitive function in the elderly. Methods: The subjects were 60 users of senior community center and elderly day care center. The survey was conducted from November to December 2018. Subjects were assessed by oral examination and myofunction test. Oral myofunction was measured using IOPIR and Lip de CumR. Survey data were analyzed using the statistical programs of PASW Statistics ver. 18.0. Results: Tongue muscle strength and lips muscle strength was higher in males than in females. The tongue and lip strengths were higher in the <81 years old group than the ≥81 years old group. Functional tooth analysis showed that there was a ≥15 teeth group (40.91±7.36) and a <15 teeth group (32.52±7.14). Lip muscle strength analysis showed that the ≥15 teeth group (10.54±3.40) was higher than the <15 teeth group (8.20±2.41, p <0.05). Tongue muscle strength, lumbar muscle strength, and functional tooth number were lower in the elderly subjects with mild cognitive impairment. Cognitive function was significantly correlated with functional tooth number (r=0.386, p <0.001), tongue strength (r=0.478, p <0.001), and lip strength (r=0.281, p <0.05). Tongue strength was significantly correlated with lip strength (r=0.360, p <0.001) and functional tooth number (r=0.633, p <0.001). Lip strength was significantly correlated with functional tooth number (r=0.376, p <0.001). Conclusions: These results showed that age and functional tooth number influenced oral muscle strength and that the number of functional teeth and oral muscle strength were low in the elderly with mild cognitive impairment. Oral myofunction training and oral care program are suggested to improve the quality of life of the elderly.

Objectives: The resin infiltration technique is a promising alternative therapy for arresting the early dental caries. However, there are very few reports on the safety and biocompatibility of this technique. We evaluated various properties of resin infiltrant (RI) based on a triethylene glycol dimethacrylate (TEGDMA).The water sorption (Wsp) and water solubility (Wsl) was assessed. Additionally, the cytotoxicity of RI against both animal and human fibroblast cell lines was investigated. Methods: The RI of the Icon®, the first product developed for resin infiltration, is mainly composed of TEGDMA in the resin matrix. The Wsp and Wsl for the RI were measured in accordance with ISO 4049 specifications. Fourier-transform infrared spectroscopy (FTIR) was used for analyzing the polymerization before and after curing of RI. The cytotoxicity of RI against the mouse fibroblasts (L929) and human gingival fibroblasts (hTERT-hNOF) was evaluated using MTT [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide] assay and the data were analyzed using one-way analysis of variance. Results: Wsp and Wsl of the RI specimens were 53.37 μg/mm3 and 10.6 μg/mm3, respectively. FTIR analysis revealed a slightly higher degree of curing with longer irradiation time. The degree of conversion for RI was high (80.9%) after 40 seconds of light curing. There was a significant decrease in the viability of L929 and hTERThNOF cells at RI extraction solution concentrations above 50%, respectively, compared to that in the negative control ( p < 0.05). Conclusions: Even though the RI exhibited positive effect on the early prevention of dental caries, the clinicians should also consider the toxicity of RI on periodontal tissues.

Objectives: This study aimed to identify the factors related to the completion status of continuing education and to help develop professional ability by presenting improvement directions. Methods: A questionnaire survey involving 500 dental hygienists working at 155 dental clinics in Gwang-ju was conducted between June 19 and July 29, 2017. Descriptive analysis, chi-square tests, and t-tests were conducted using Statistical Package for Social Sciences Version 21.0 for Windows. Finally, to investigate the factors related to the completion of continuing education, logistic regression analysis was performed. Results: The odds ratio (OR) was higher in the group with more than 16 years of total work carrier (OR=3.40, 95% confidence interval (CI)=1.22–9.45) than that in the group with 1–5 years of work carrier. Groups receiving information from associations (OR=5.35, 95% CI=1.74–16.40), groups that directly search for information (OR=6.53, 95% CI=1.84–23.12), and groups receiving information from colleagues (OR=3.55, 95% CI=1.17–10.77) had higher ORs than groups receiving no information. The OR was higher in the group receiving cost support for participation (OR=2.20, 95% CI=1.06–4.55) than the group receiving no support. Regarding total education completion status in 2012–2014, groups that completed grades 1–7 (OR=2.51, 95% CI=1.35–4.64) and those that completed grade 8 or higher (OR=14.37, 95% CI=7.68–26.89) had higher ORs than groups who received no education. Conclusions: The rate of completion of continuing education can be increased by reviewing the course contents, publicity activities, and cost of continuing education.