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    Lateral Cephalometric Standards for Mongolian 6-15 Year Old Children with Normal Occlusion
    (Mongolian National University of Medical Sciences, 2018-09-25) ; ; ;
    Keiji Moriyama
    ;
    Objectives: The aim of this study was to establish the age and gender-specific lateral cephalometric standards for Mongolian children with normal occlusion. Methods: A total of 541 children between 6 and 15 years of age were selected based on the normal occlusion criteria. Lateral cephalograms of each subject were scanned and analyzed with the use of WinCeph version 11.0 software package. Descriptive statistics (mean and standard deviation) were calculated for all measured variables. Independent t-tests were performed to assess the intergender differences. Results: Cephalometric angular measurements remain largely constant, whereas most cephalometric linear measurements change with advancing age, such as anterior facial height (N-Ans, Ans-Me), hard palatal length (Ans-Pns) mandibular ramus height (Cd-Go), mandibular body length (Cd-Gn) were increasing significantly by dental age in both gender. Gender differences were not statistically significant for any of the angular measurement at ages studied, but linear measurements of male subjects had larger average values than female subjects. Conclusion: Our results showed that linear cephalometric dimension of the hard tissue was gender-dependent. Therefore, gender-specific differences of craniofacial distances should be taken into account during diagnosis and treatment planning. The results from this study can be used as reference values for 6-15 years old children of Mongolia.
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    Lateral Cephalometric Linear Measurement Standards of Mongolian Children with Normal Occlusion from 6-7 Years of Age
    (Mongolian National University of Medical Sciences, 2017-06-25) ; ; ; ;
    Moriyama, Keiji
    Objectives: The aim of this study was to analyze craniofacial linear dimensions in subjects with normal occlusions to establish age and gender-specific lateral cephalometric linear measurement norms for Mongolian children. Methods: 161 six year old children and 122 seven year old children were recruited for this study. Digital cephalograms of 75 six year old children (34 male and 41female), 49 seven year old children (22 male and 27 female) were selected to establish lateral cephalometric linear measurement norms. Anatomic landmarks were identified directly on the digital images. The means and standard deviations of linear measurements were calculated using 18 variables. Student’s t-test was employed to test for gender differences in each age. Results: Anterior cranial base length and midfacial length were significantly larger in six year old male subjects. Mo-Ms and A-Ptm were significantly larger in seven year old male subjects. Conclusion: Our results showed that linear craniofacial dimension of the hard tissue was gender-dependent. Therefore, gender-specific differences of craniofacial distances should be taken into account during diagnosis and treatment planning. The results from this study can be used as reference values for 6-7 years old children of Mongolia.
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    Association between maternal education and malocclusion in Mongolian adolescents: a cross-sectional study
    (2016-11) ;
    Fujiwara, Takeo
    ;
    Komazaki, Yuko
    ;
    Kawaguchi, Yoko
    ;
    Tanaka, Toshihiro
    OBJECTIVE: Malocclusion is a highly prevalent condition, affecting 20-60% of adolescents worldwide. Although its treatment is often expensive and unaffordable for disadvantaged individuals, few studies have examined the relationship between malocclusion and socioeconomic status. We investigated the prevalence of malocclusion among Mongolian adolescents and its association with maternal education in a community-based sample in Mongolia. DESIGN: Cross-sectional study. SETTINGS: 2 large secondary schools with different backgrounds in Ulaanbaatar, Mongolia. PARTICIPANTS: Complete dental casts of 557 randomly recruited Mongolian schoolchildren aged 11-16 years were evaluated using the Dental Health Component of the Index of Orthodontic Treatment Need to dichotomise orthodontic treatment requirements. Exclusion criteria were the presence of orthodontic treatment history and absence of maternal educational status. Questionnaires were administered to caregivers to assess socioeconomic status. Poisson regression analysis was performed to examine the association between malocclusion and maternal educational status. RESULTS: The prevalence of malocclusion requiring orthodontic treatment among all adolescents was 35.2% (95% CI 31.2 to 39.2). In the unadjusted analysis, the prevalence ratio (PR) for malocclusion was higher (PR=1.46; 95% CI 0.96 to 2.20) among adolescents of mothers with a high educational background than among those of mothers with a low educational background. After adjusting for covariates, the PR remained significantly higher (PR=1.72; 95% CI 1.06 to 2.82) among adolescents of mothers with a high educational background. Other socioeconomic status variables, including family income and the educational level of the father, showed no association with malocclusion. CONCLUSIONS: These findings suggest that malocclusion requiring orthodontic treatment in adolescents is more prevalent among children of mothers with high levels of education. Further studies are needed to clarify the behavioural factors and environmental circumstance that contribute to this.
    Scopus© Citations 16
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    Associations between Malocclusion and Oral Health-Related Quality of Life among Mongolian Adolescents
    (2017-08)
    Araki, Miyu
    ;
    Yasuda, Yuko
    ;
    Ogawa, Takuya
    ;
    ;
    Malocclusion may affect oral health-related quality of life (OHR-QoL), however, the previously detected associations were affected by confounding factors. We hypothesized that there is indeed an association between OHR-QoL and malocclusion and investigated in a population-based study of 420 Mongolian adolescents mean age: 12.6 (standard deviation (SD) = 1.09) years from two secondary schools, located in an urban and a suburban area. We randomly selected two classes from each school. The Index of Orthodontic Treatment Need (IOTN) was used to assess malocclusion. OHR-QoL was assessed using the Child Perceptions Questionnaire (CPQ). Multivariate analysis was used to determine whether malocclusion had an independent effect on OHR-QoL. Overall, the existence of any type of malocclusion was not significantly associated with CPQ results. However, increased overjet was significantly associated with oral symptoms (coefficient: 0.66, 95% CI: 0.14-1.19), functional limitations (coefficient: 0.62, 95% CI: 0.17-1.08), and social well-being (coefficient: 0.50, 95% CI: 0.06-0.93). Deep bite was also significantly associated with oral symptoms (coefficient: 0.54, 95% CI: 0.23-0.84) and functional limitations (coefficient: 0.45, 95% CI: 0.19-0.72). Although malocclusion per se was not significantly associated with OHR-QoL, specific types of malocclusion, i.e., increased overjet and deep bite, were associated with OHR-QoL.
    Scopus© Citations 30
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    Cone-Beam Computed Tomography-ийн зурагт хоншоор эрүүний шүдний сурвалж хоорондын зайг тодорхойлсон дүн
    (2019-11-18) ; ; ;
    З.Сүнжидмаа
    ;
    Б.Эрдэнэбулган
    Үндэслэл: Сүүлийн жилүүдэд Монгол улсад төдийгүй Дэлхий нийтэд нүүр амны гажиг заслын (НАГЗ) эмчилгээнд орчин үеийн эмчилгээний шинэ аргууд эмнэл зүйн практикт өргөн нэвтэрч үүнээс улбаалан эмчилгээний төрөл олширч, чанар сайжирч байна.1 Манай оронд рентген шинжилгээний аргуудыг ашиглан өвчин эмгэгийн явц, оношилгоо, эмчилгээний үр дүнг судалсан олон тооны судалгааны ажлууд байгаа боловч Монгол хүний хоншоор эрүүний ясны морфометрийн үзүүлэлтүүдийг CBCT аргаар тодорхойлсон судалгааны ажил хараахан хийгдээгүй байгаа нь энэ судалгааг хийх үндэслэл болсон. Монгол хүний хоншоор, эрүүний шүдний сурвалж хоорондын зайг CBCT зурагт тодорхойлох. Зорилго: зорилт: Монгол хүний хоншоор, эрүүний шүдний сурвалж хоорондын зайг CBCT зурагт тодорхойлох. Материал арга зүй: Судалгааг АШУҮИСийн НАСЭ-ийн Нүүр Амны Дүрс Оношилгооны тасгийг түшиглэн ретроспектив судалгааны аргыг ашиглан хийж гүйцэтгэв. Шүдний сурвалж хоорондын зайг хэмжихдээ шалгуур үзүүлэлтийг хангасан CBCT зургийн Axial зүслэгт хоншоорын I, II бага араа, I их араа шүдний медиал дисталь ь талд, эрүүний II бага араа, I их араа шүднүүдийн медиал, дисталь ь талд шугаман хэмжилт хийсэн. Хэмжилтийг хийхдээ шүдний паалан ясжмаг эдийн заагаас сурвалж тийш 3, 5, 7 мм-ийн зайтай Choi H (2014) нарын аргаар хацар талын сурвалжийн хооронд, медиал дисталь ь чиглэлд, 2 сурвалжийн хамгийн ойр хэсэгт, урд шүдний нягт ялтаснаас арын шүдний нягт ялтасны хооронд шугаман хэмжилт хийв. Дүгнэлт: Хоншоорын шүдний сурвалж хоорондын зай нь паалан ясжмаг эдийн заагаас 7 мм зайд хамгийн өргөн байна. Хоншоорт соёо-I бага араа шүдний сурвалж хоорондын зай хамгийн өргөн байна. Эрүүний шүдний сурвалж хоорондын зай нь паалан ясжмаг эдийн заагаас 7 мм зайд хамгийн өргөн бол их араа шүдтэй харьцуулахад бага араа шүдний сурвалж хоорондын зай өргөн байна.