JKAOH Journal of Korean Academy of Oral Health

ISSN(Print) 1225-388X ISSN(Online) 2093-7784

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  • Original Article 2020-03-30

    Prediction of dental caries in 12-year-old children using machine-learning algorithms

    Yong-Hoon Yang, Ji-Soo Kim, Seung-Hwa Jeong

    Abstract : Objectives: The decayed-missing-filled (DMFT) index is a representative oral health indicator. Prediction of DMFT index is an important basis for the development of public oral health care projects and strategies for caries prevention. In this study, we used data from the 2015 Korean children’s oral health survey to predict DMFT index and caries risk groups using statistical techniques and four different machine-learning algorithms. Methods: DMFT prediction models were constructed using multiple linear regression and four different machine-learning algorithms: decision tree regressor, decision tree classifier (DTC), random forest regressor, and random forest classifier (RFC). Thereafter, their accuracies were compared. Results: For the DMFT predictive model, the prediction accuracy of multiple linear regression and RFC were 15.24% and 43.27%, respectively. The accuracy of DTC prediction was 2.84 times that of multiple linear regression. The important feature of the machine-learning model, which predicts DMFT index and the caries risk group, was the number of teeth with sealants. Conclusions: Using data from the 2015 Korean children’s oral health survey, which is considered big data in the field of oral health survey in Korea, this study confirmed that machine-learning models are more useful than statistical models for predicting DMFT index and caries risk in 12-year-old children. Therefore, it is expected that the machine-learning model can be used to predict the DMFT score.

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  • Editorial 2021-06-30

  • Original Article 2020-03-30

    Oral health condition according to distribution of periodontopathic bacterial complex

    Ji-Hye Kim, Dong-Ik Lee, Sang-Uk Im, Eun-Suk Jeon, Keun-Bae Song, Youn-Hee Choi

    Abstract : Objectives: The purpose of this study was to evaluate the association between the distribution of periodontopathic bacteria and oral conditions. Methods: Stimulated saliva was collected from 162 adults aged 60 years and above. The prevalence and amount of periodontopathic bacteria in the saliva were analyzed using real-time PCR. Pocket depth and clinical attachment loss were examined to evaluate the oral conditions of the subjects. Patients who had at least one tooth surface involved, with a pocket depth ≥4 mm or clinical attachment loss ≥5 mm were classified as having periodontal disease. Results: The detection rates of most bacteria in the orange and green complexes were more than 90%, while those of P. gingivalis and T. forsythia in the red complex were 58.6% and 61.7%, respectively. The number of bacteria in the red complex positively correlated with each other. There were no significant differences in the number of types of red complex bacteria in the saliva and the distribution of residual number of teeth and periodontal disease (P>0.05). On the other hand, the number of remaining teeth in subjects with higher bacterial density were more than those with lesser bacterial density. In addition, the occurrence of dental disease differed significantly depending on the number of P. gingivalis and T. forsythia. Conclusions: The relative amount of periodontopathic bacteria is important in the occurrence of periodontal disease, and the number of these bacteria positively correlated with each other.

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  • Editorial 2020-12-30

  • Original Article 2021-06-30

    Association between masticatory function and cognitive impairment in the elderly

    Taejun Park , Hyojin Heo , Min-Jeong Cho , Hyeon Chang Kim , Yoosik Youm , Keun-Bae Song , Youn-Hee Choi

    Abstract : Objectives: With the surge in the elderly population, a growing interest in the prevention and treatment of geriatric diseases has been observed, along with awareness of the severity of problems associated with dementia, a cognitive impairment. The purpose of this study was to investigate the correlation between chewing ability and cognitive function among elderly people residing in a rural area. Methods: A total of 162 elderly individuals, aged between 65 and 97 years, were surveyed. Trained examiners conducted interviews and assessments of chewing ability, on the basis of the number of remaining teeth, denture status, masticatory performance evaluating gum, ShadeEye-NCC measuring overall change in color of the gum (ΔE), and T-Scan®III analyzing distribution of occlusion patterns. Cognitive function was assessed using the Korean version of the Mini-Mental State Examination-Dementia Screening (MMSE-DS) tool. Results: Participants with a low score in the MMSE-DS were found to have distinguishably lower denture need, smaller number of remaining teeth, and lesser color change in the masticatory performance evaluating gum. In the cognitive impairment group, a tendency of having unilateral and anterior occlusion led to occlusal discomfort and chewing difficulties. Conclusions: The study highlights important associations between chewing ability and cognitive function. The finding corroborates that tooth loss may be a predictive risk factor for cognitive impairment.

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  • Original Article 2021-03-30

    Related factors of re-visit intention to the oral health care center for the disabled

    Yeong-Ae Choi , Yun-Sook Jung , Jae-Min Kang , Young-Eun Lee , Youn-Hee Choi , Keun-Bae Song

    Abstract : Objectives: The aim of this study is to identify the factors related to re-visit intentions of patients who had visited the 10 oral health care centers for the disabled currently operating in Korea. Methods: A self-developed questionnaire (29 items) was distributed among 1,000 randomly selected patients and their guardians who had visited one of the 10 oral health care centers for the disabled, with a consent. Consequently, 874 questionnaires were collected and analysed for statistics using SPSS 25.0. Results: The patients traveled a long distance to visit the oral health care centers because of their specialization for the disabled. With the level of satisfaction with dentist services, dental hygienist services, and facilities increasing, the re-visit intention proportionally rose. Conclusions: This study presents basic data that provides information on the operation of 10 oral health care centers for the disabled. It is imperative to develop a more structured questionnaire, and conduct an annual survey of the disabled visiting the centers.

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  • Original Article 2020-03-30

    Effects of oral health-related self-efficacy on oral health-related quality of life in male high school students

    Kui-Ye Yang, Ji-Eon Jang

    Abstract : Objectives: To evaluate the association between oral health-related quality of life and oral health-related self-efficacy in high school students. Methods: A questionnaire-based survey was conducted among high school students in Daegu, South Korea from November to December 2015, and the final data of 432 students were analyzed. Results: Analysis of oral health-related self-efficacy in terms of general characteristics showed that both grade and income were significant factors (P

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  • Original Article 2021-06-30

    Influences of presenteeism of clinical dental hygienists

    Min Kyoung Hye , Min Hee Hong

    Abstract : Objectives: The aim of this study was to measure the presentism, intention of employment, self-efficacy, degree of exhaustion, and factors affecting presentism of clinical dental hygienists for use as basic data when developing measures to address presentism. Methods: A self-reported questionnaire was completed by 210 clinical dental hygienists from April 1 to June 30, 2020. Data were analyzed using SPSS 20.0. Independent t-test, one-way ANOVA, the Scheffé post-hoc test, and Pearson correlation analysis were applied, based on which a multiple regression analysis was conducted. Results: Dental hygienists scored 3.09 points in presenteeism. The variables that influenced clinical empowerment were job and career burnout, explaining 12.3% of the variance in scores among dental clinic hygienists. Conclusions: As a result, clinical dental hygienists’ presentism is associated with clinical background and exhaustion, and exhaustion as the strongest influence. Therefore, in order to reduce the loss of clinical dental hygienists due to presentism, it is necessary to develop and apply health promotion programs that can manage clinical dental hygienists’ health problems early and to provide support in the organizational aspects of their work.

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  • Letter 2020-03-30

  • Original Article 2021-03-30

    The finance and manpower of oral health care system in Korea and comparison with six selected countries

    Se-Hwan Jung

    Abstract : Objectives: The purpose of this study is to investigate the financial and manpower indicators of the oral health care system in Korea and to compare them with six selected countries — the US, Japan, Germany, France, the UK, and Sweden. Methods: It used the Organisation for Economic Co-operation and Development (OECD) statistics website and official data sources of the Korean government. Results: In Korea, total oral health care expenditure (TOHCE) per capita was US $ 208, the TOHCE as a share of GDP was 0.5%, the TOHCE as a percentage of total health care spending (THCE) was 6.2%, and the percentage of out-of-pocket payments of TOHCE was 58.8% in 2019. The number of practising dentists per 1,000 population was 0.50 in 2018, and the average annual growth rate since 2000 was 3.3%. Dental specialists as a percentage of practising dentists increased from 0.4% in 2009 to 21.8% in 2020, and the allied dental personnel-to-dentist ratio in dental hospitals and clinics rose from 1.95 in 2013 to 2.34 in 2019. In addition, in 2019, the number of dentists and dental hygienists working in health care institutions or health centers differed distinctly by area; public health dentists accounted for 88% of dentists working at health centers and multiple general dentists were secured in five metropolitans/provinces. Conclusions: In the 21st century, the financial and manpower indicators of oral health care in Korea rose significantly, comparable to the six selected countries, although quality limitations remain. In the future, it is expected that these policies in Korea will be enhanced based on the indicators identified in this study.

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December, 2021
Vol.45 No.4

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JKAOH Journal of Korean Academy of Oral Health
ISSN(Print) 1225-388X ISSN(Online) 2093-7784