JKAOH Journal of Korean Academy of Oral Health

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

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  • Editorial 2020-06-30

  • Original Article 2020-03-30

    Molecular epidemiology and characterization of Streptococcus mutans strains in Korea

    Se-Yeon Kim, Il Kown Bae, Jung-Ha Lee, Jeong Hwan Shin, Jin-Bom Kim

    Abstract : Objectives: We investigated the characteristics of Streptococcus mutans in the national culture collection from Korea. Twenty-nine (dental plaque, n=27; endodontic infections, n=1; blood, n=1) isolates were included in this study. Methods: Antimicrobial susceptibilities were tested using the disk diffusion test. Multilocus sequence typing (MLST), serotyping, and collagen-binding genes were used for polymerase chain reaction (PCR) and direct sequencing. A collagen-binding (to assess the adhesion properties) assay was performed. S. mutanss demonstrated high susceptibility to antimicrobial agents. Differences in collagen-binding abilities of the cnm-positive and -negative groups were compared using the Mann-Whitney U test (P

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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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  • Original Article 2020-09-30

    Analysis of oral health contents in middle and high school health textbooks in Korea

    Ji-Liang Kim , Jung-Eun Park , Jong-Hwa Jang

    Abstract : Objectives: This study investigated the contents and structure of chapters on oral health to determine the quality of middle and high school health textbooks. We also comparatively analyzed the learning objectives of these textbooks according to the oral health curriculum proposed by the Virginia Department of Health (VDH) and South Carolina Department of Education (SCDE). Methods: The structure and educational contents of eight health textbooks (middle school, five; high school, three) published in 2019 were analyzed methodologically. We compared the structure and contents between the middle and high school curricula. We also carried out comparisons among five publishing companies. Results: Of the eight health textbooks examined, five (middle school, four; high school, one) had chapters on oral health. In terms of structure, textbooks published by company A had the lowest percentage (0.96%) of pages on oral health. The highest percentage (1.50%) was found in a middle school textbook published by company D. We noted subject-level differences between the curriculum proposed by VDH, SCDE, and that of the published textbooks. There were more keywords pertaining to the definition and development of oral diseases than those for its prevention and management. Conclusions: It is critically important to impart oral health education to middle and high school students for self-management of oral health during adolescence, a period characterized by both rapid physical and psychological development. Therefore, we recommend that all health textbooks should include chapters on oral health. Further, in the health textbooks that already include oral health information, we propose that the revised curricula should include key learning objectives.

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  • Original Article 2019-09-30

    Financial estimate of light-curing composite resin treatment after National Health Insurance Service coverage

    Jae-In Ryu, Se-Hwan Jung, Dong-Hun Han, Sae-Rom Lee, Ji-Eun Jeon

    Abstract : Objectives: This study aimed to estimate the financial budget of light-curing composite resin fillings based on the expanded coverage of the National Health Insurance Service (NHIS), called “Moon Care.” Methods: The estimated population with dental caries and the amount of light-curing composite resins used were determined. The fees for the resin fillings per tooth were considered for the calculations. The expected budget for the next five years for children and adolescents aged 5-12 and 5-19 years were calculated. Results: During the first year of the coverage, the budget for children and adolescents aged

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  • Editorial 2020-09-30

  • 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 2019-09-30

    Inhibition of dental erosion through addition of calcium to commercial plum beverages

    Ji-Eun Kim, In-Gyeong Yun, Seong-Soog Jeong, Ki-Ho Chung, Choong-Ho Choi

    Abstract : Objectives: We examined the effect of commercial plum beverages on dental erosion and whether the addition of calcium to these beverages would inhibit dental erosion. Methods: We analyzed three groups as follows: Maesil 1 group (Chorok Maesil), Maesil 2 group (Sunkist plum), both of which were selected from commercially-available plum beverages, and Calcium-added maesil group (addition of 3% calcium to Chorok Maesil). For negative and positive control groups, Jeju Samdasoo and Coca Cola were selected, respectively. The characteristics of the experimental beverages were analyzed, and the specimens were immersed in the experimental beverage. The degree of erosion was measured by Vickers hardness number (VHN) and scanning electron microscope images. Results: Positive control group had the lowest pH (2.50±0.03), followed by Maesil 2 (pH 2.59±0.01), Maesil 1 (pH 2.81±0.02), calcium-added maesil (pH 4.19±0.01), and negative control group (pH 7.57±0.06). Significant differences were found in surface microhardness between positive control, Maesil 1, Maesil 2 and calcium-added maesil group before immersion and at 30 minutes after immersion (P

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  • Original Article 2019-12-30

    Tooth whitening effects of manicure-type hydrogen peroxide tooth whitening gel

    Yong-Gwan Kim, Ji-Hyeon Park, Ja-Won Cho

    Abstract : Objectives: To examine the tooth whitening effects of a 3% hydrogen peroxide gel. Methods: Twenty participants were given experimental tooth whitening gels containing 3% hydrogen peroxide, and another 20 participants, who served as the control group, were given tooth whitening gels that contained no hydrogen peroxide. Both groups used their respective whitening agents for 1 week, and tooth lightness was examined at baseline and 4 and 7 days after the experiment. Results: Compared with the control group, in the experimental group, lightness values, determined using VITA classical A1-D4® and VITA SYSTEM 3D-MASTER®, were significantly increased after using the 3% hydrogen peroxide whitening agent (P

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  • Original Article 2019-09-30

    Efficacy of different tooth-brushing methods for removing dental plaque

    Jeongmin Ko, Seon-Jip Kim, Hyun-Jae Cho

    Abstract : Objectives: This study aimed to measure the efficacy of different tooth-brushing methods for removing plaque in Korea. Methods: This study was conducted with the approval of the Institutional Review Board (IRB) of the Seoul National University School of Dentistry (S-D20180021). Thirty participants aged between 19 and 30 years, who did not have periodontal disease, were enrolled in this observational study. Participants were given the same type of toothbrush and toothpaste and asked to brush their teeth as they usually would. During brushing, participants were recorded with a camcorder that was attached to a mirror. Participants were aware they were being recorded. After they had finished brushing their teeth, a dental plaque staining and oral plaque index (PI) examination was performed. The PI score was measured using the Turesky modified Quigley Hein Index. Brushing methods were classified as rolling, horizontal, vertical, circling, and oblique. Skipped surfaces were recorded separately. Following this, statistical analysis was performed using SPSS software. Results: Most surfaces of the mouth were skipped. The most commonly used brushing method was the circling method, followed by the vertical, horizontal, rolling, and oblique methods. The most frequently used method on the vestibular surface was circling, with 52.92% of the oral surface skipped. The oblique brushing method had the lowest mean PI score with a mean±SD of 1.73±0.82. The mean PI score of the skipped surfaces was the highest with a mean±SD of 2.52±0.81. We also analyzed the linear mixed model considering the different lengths of time spent brushing. Both the brushing method used and the time spent brushing had a significant effect on the PI score, but no interactions between these were observed. In areas where a horizontal brushing method had been used, the PI score was significantly decreased. Conclusions: This study suggests that the horizontal brushing method is an efficient tooth-brushing method compared to the other methods. Additionally, tooth-brushing for more than 10 seconds on 3 to 4 teeth area was effective in removing dental biofilm.

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March, 2021
Vol.45 No.1

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