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

    Effects of some commercial calamansi-containing beverages on the enamel surface

    Eun-kyoung Kim, Hae-Ryoung Park, Kyung-Yi Chung, Choong-Ho Choi, Seong-Soog Jeong

    Abstract : Objectives: The aim of this study was to investigate the effects of some commercial calamansi-containing beverages on the sound surface of bovine teeth as well as the dental erosion inhibitory effects of calcium. Methods: The pH and titratable acidity of six kinds of commercially available calamansi beverages were determined. Further, 3% calcium was added to the calamansi beverage Oranssi in the experimental group to confirm its dental erosion inhibitory effect. Jeju Samdasoo was used in the negative control group and Coca-Cola in the positive control group. After immersing the sound teeth specimens for 10 min, surface microhardness was measured using the Vickers hardness number (VHN), and surface changes in specimens were observed under a scanning electron microscope. Results: The average pH of the commercial calamansi beverages was 2.54±0.22. After 10 min of treatment with each experimental beverage, the surface hardness difference (ΔVHN) was highest in the Coca-Cola group (―49.05±12.59), followed by the Oranssi calamansi group (―43.77±13.70), 3% calcium-added Oranssi calamansi group (―2.71±12.58), and Samdasoo group (14.03±20.79). There was no significant difference between the bottled water and calcium-added Oranssi calamansi groups or between the Coca-Cola and Oranssi calamansi groups (P>0.05). However, there was a significant difference in the surface hardness between the bottled water and Coca-Cola groups (P

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  • Original Article 2020-12-30

    Caries prevalence by risk factor and tooth type using DMFT-related indices

    Hyunseok Lee , Soyoun An

    Abstract : Objectives: One of the main causes of tooth loss in Korea is dental caries, a chronic disease affecting individuals of all ages worldwide. The average decayed, missing, and filled teeth (DMFT) index, a measure of the caries experience of the population, has been stagnating in Korea for a number of years. The purpose of this study was to investigate the pattern of caries prevalence by tooth type, and to identify the characteristics and risk factors of the specific affected caries (SaC) and significant caries (SiC) groups in Korea’s 12-year-old children. Data were obtained from the 2018 Children’s Oral Health Survey.Methods: Data from a total of 22,303 subjects were included in the study. We grouped the data according to two DMFT-related indices, the SaC index, which includes all subjects who have experienced a carious lesion, and the SiC index, which includes the top one-third of the population by DMFT. We then analyzed the sociodemographic variables and oral health behaviors seen in these groups.Results: The average DMFT index for all the 12-year-old children was 1.89, and that of those in the SaC and SiC groups was 3.37 and 4.86, respectively. The teeth that were found to be most likely to develop caries were the mandibular and maxillary first molars, and the tooth associated with the highest mean DMFT index was the mandibular first premolar. Among the variables analyzed, perceived oral health status was the most influential variable in the SaC and SiC groups, followed by gender, and then the presence or absence of calculus. Household income was not a statistically significant variable.Conclusions: The results of this study revealed the characteristics common to 12-year-old children who are vulnerable to caries. This will provide valuable information when planning dental disease management projects.

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  • Editorial 2020-06-30

  • Original Article 2020-12-30

    Preventive effect of a 18-year water fluoridation program for dental caries in a rural area of Korea

    Ji-Soo Kim , Min-Ji Byon , Eun-Joo Jun , Seung-Hwa Jeong , Jin-Bom Kim

    Abstract : Objectives: The water fluoridation program in Hapcheon township area has been implemented since 2000. This study aimed to evaluate the caries-preventive effect of water fluoridation on permanent teeth after implementation of an 18-year community water fluoridation program in a suburban area.Methods: A survey was conducted in 2018 with 359 subjects, aged 8, 10, and 12 years, residing in the Hapcheon township area. In this prospective cohort study, the data on caries prevalence obtained from 671 subjects, aged 8, 10, and 12 years, in 2000, when the community water fluoridation program was initiated in the township, were used as a cohort to evaluate the caries-preventive effect after 18 years. The caries-preventive effect of community water fluoridation on permanent teeth was estimated by comparison of the adjusted DMFT scores between the program and the control group, and between the pre- and post-program data after 18 years. The confounding factor, mean number of fissure-sealed teeth, was adjusted to estimate the caries-preventive effect of fluoridation on permanent teeth.Results: Based on the results of the surveys conducted in Hapcheon-eup in 2000 and 2018, the mean number of fissure-sealed permanent teeth was 2.24 in 2000 and 1.38 in 2018. The mean DMFT scores of subjects aged 8, 10, and 12 years in 2018, adjusted for fissure-sealed permanent teeth in the fluoridated area, were significantly lower than those reported by the 2018 Korea National Children’s Oral Health Survey. In addition, the mean values of the adjusted DMFT scores of subjects aged 8, 10, and 12 years in 2018, after the 18-year fluoridation program, were significantly lower than those reported in 2000, the year the fluoridation program was initiated.Conclusions: Community water fluoridation has a high caries-reducing effect; thus, the reintroduction of water fluoridation program is desirable to prevent dental caries.

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  • 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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  • Original Article 2020-03-30

    Antibacterial effect of different concentrations of Galla Chinensis extract on cariogenic bacteria in a biofilm model

    Eun-Jeong Kim, Bo-Hyoung Jin

    Abstract : Objectives: Galla Chinensis inhibited the adherence of planktonic oral bacteria and acid production by cariogenic bacteria. However, little is known about the relevant conditions of Galla Chinensis extract (GCE) exposure time and concentration and the effect of GCE on the structural and functional activity of cariogenic bacteria. The antibacterial effects of natural G. Chinensis extract on S. mutans, S. sanguinis, and S. oralis biofilms were evaluated in vitro. Methods: Biofilms formed on glass surfaces were treated with different concentrations of GCE at different exposure times. The effects were assessed by examining the bactericidal activity, acidogenesis, minimum inhibitory concentration, and morphology. Results: There was a statistically significant difference in the bacterial growth inhibition depending on the concentration of the GCE, with bacterial growth being inhibited as the concentration of GCE increased. A concentration of 1.0 mg/ml GCE had similar bactericidal effects against S. mutans and S. oralis biofilms to those produced by 2.0 mg/ml CHX. In the 1.0 mg/ml GCE group, incomplete septa were also observed in the outline of the cell wall, together with disruption of the cell membrane. In addition, there was also a slight exudation of the intracellular content from the bacteria in the 1.0 mg/ml GCE and 2 mg/ml CHX groups. Conclusions: These results indicate that GCE inhibits the growth of S. mutans, S. sanguinis, and S. oralis with increasing concentrations. It alters the microstructure of S. mutans biofilms. These results suggest that GCE might be a useful anti-bacterial agent for preventing dental caries.

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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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  • Original Article 2020-12-30

    Factors related to CPR performance ability of dental hygenists working in dental hospitals

    Eun-Young Choi , Choong-Ho Choi

    Abstract : Objectives: In this study, we aimed to investigate the cardiopulmonary resuscitation (CPR)-related knowledge, attitude, and performance among dental hygienists working in the hospitals. We believe that it is important to develop CPR education programs that would enable dental hygienists to offer accurate and timely aid in emergency situations.Methods: From June 20 to August 20, 2019, 220 dental hygienists at seven selected dental hospitals located in Gwangju Metropolitan City and Jeollanam-do, South Korea were requested to fill a questionnaire as part of a survey.The data regarding the general characteristics, CPR-related characteristics, and CPR-related knowledge, approach, and performance were collected, and analyzed using independent t-tests, one-way analysis of variance (ANOVA), Pearson’s correlation coefficient, and simple regression analysis using the SPSS Windows ver. 25.0.Results: Correlation analysis revealed that high CPR-related knowledge and a more positive approach towards CPR are both associated with high confidence in performing CPR (r=0.37, r=0.415, r=0.605). Furthermore, factors, such as high CPR-related knowledge, positive attitude towards CPR, knowledge regarding the location of automated external defibrillators (AEDs) in the hospital, and AED training experience significantly affects the CPR-related performance.Conclusions: Therefore, it is important to develop systematic and beneficial educational programs and provide and update educational material regularly in dental hospitals with an aim to improve CPR-related knowledge and attitude among the dental hygienists.

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  • 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 2020-12-30

    The prevalence of taurodontism in primary molar and correlation with permanent first molar

    Seunghee Woo , Jongsoo Kim , Joonhaeng Lee , Jongbin Kim

    Abstract : Objectives: The purpose of this study was to investigate the prevalence of permanent first molar taurodontism and identify the correlation between primary molars and permanent first molar taurodontism.Methods: Among the 10,113 children who underwent panoramic radiography at a dental hospital from January 2010 to December 2019, 685 children (404 boys, 281 girls) were included in this study.Results: Six children (0.8%) and 98 children (14.1%) showed taurodontism of the primary molars and permanent first molar, respectively. All of the children with taurodontism in the primary molars had at least one taurodontism in the permanent first molars.Conclusions: Early diagnosis of taurodontism in primary molars might allow dentists to make treatment plans in accordance with tooth development.

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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