著者

Rafiqul Islam Mohammad Khursheed Alam Ayako Mukai Yumiko Murakami Masahito Shoumura Naoto Osuga Mohd Fadhli Khamis

出版者

THE SOCIETY FOR HARD TISSUE REGENERATIVE BIOLOGY

雑誌

Journal of Hard Tissue Biology (ISSN:13417649)

巻号頁・発行日

vol.26, no.4, pp.361-368, 2017-10-01 (Released:2017-10-03)

参考文献数

24

被引用文献数

1

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Research related to tooth size, tooth size discrepancy and relationship with BMI in transgender population is yet to be explored in dentistry. The purpose of this study is to establish normative data on mesiodistal width dimensions associated with BMI and tooth size discrepancy in transgender population. The data were derived from dental casts of 151 transgender individuals (75 transgender male, 76 transgender female; age group 18-30). Data were analysed using independent t-test and ANOVA. The mean and standard deviation were calculated for individual tooth size, Bolton’s overall and anterior ratios, and BMI separately for transgender males and females. The mesiodistal widths of the maxillary teeth showed higher variability than the mandibular teeth and the mean value was higher in transgender females than in males and revealed statistically significant differences. Bolton’s anterior ratios were found to be 78.05 (±3.67) for male and 78.90 (±4.12) for female. The mean of Bolton’s overall tooth ratio for male 91.03(±3.66) and for women was 91.46(±3.91) with no significant differences (p >0.05). No significant differences between BMI and mesiodistal tooth dimensions except for the left first molar tooth in mandible and left lateral incisor tooth in maxilla between overweight and underweight groups (p<0.05). These findings indicate that population-specific standards are necessary for clinical assessments and for several dental treatment purposes. Moreover, it is appropriate to use transgender norms in a regular dental practice for transgender individuals.

著者

土井 克則 Mohd FADHLI 川島 渉 中村 佳朗

出版者

一般社団法人 日本航空宇宙学会

雑誌

日本航空宇宙学会論文集 = Journal of the Japan Society for Aeronautical and Space Sciences (ISSN:13446460)

巻号頁・発行日

vol.59, no.693, pp.273-280, 2011-10-05

参考文献数

14

被引用文献数

3

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A boomerang thrown properly into the air can fly in an elliptical path and return to the point of origin. In this study, such a motion of the boomerang was numerically simulated to clarify the mechanism of the motion. The simulation was conducted by the double CFD method which is the coupling method of the computational fluid dynamics and the computational flight dynamics. We considered the case that a small flat boomerang was thrown with a translational and a rotational velocity, an angle of the translational velocity from a horizontal plane, and no roll angle. Results showed that the boomerang lifted and traveled in a path with changing roll and pitch angles due to a pressure distribution on its surface, and returned to a point near the origin. Furthermore, an experiment was performed to confirm the validity of the computational results, and the experimental result was qualitatively corresponding to the computational results.