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Masticatory Performance Measured with a Chewing Gum Containing Spherical Resinous Microparticles
Toshiya Kanazawa,Takashi Zaitsu,Masayuki Ueno,Yoko Kawaguchi 대한예방치과학회 2018 International Journal of Clinical Preventive Denti Vol.14 No.4
Objective: This study aimed to investigate the factors associated with masticatory performance, as measured with a chewing gum containing spherical resinous microparticles, and to evaluate the method by examining the relationship with self-reported masticatory status. Methods: The participants in this study comprised 903 industrial workers (mean age, 42.2±11.6 years). A questionnaire was administered to assess self-reported masticatory status. The masticatory performance score was calculated by counting the number of particles in the chewing gum. Clinical oral examinations were administered. Multiple linear regression analysis was conducted on the masticatory performance scores to examine the related factors. Analysis of covariance was conducted to investigate the association between the masticatory performance score and the self-reported masticatory status. Results: Significant predictors of the masticatory performance score were sex (p<0.001), age (p<0.001), decayed teeth (p=0.009), total-functional tooth units (p<0.001), periodontitis (p=0.003), and malocclusion (p=0.011). The relationship between the masticatory performance score and the self-reported masticatory status was attenuated after controlling for confounding factors. Conclusion: The masticatory performance increased with age and decreased as the oral health status worsened. Using this chewing gum method partly, but not comprehensively, reflects masticatory performance. Therefore, various masticatory performance- related indexes should be employed to measure masticatory performance accurately.
The Impact of ASEAN-Korea Free Trade Agreement on Foreign Direct Investment
Ryoma Kanazawa,강문성 한국경제연구학회 2019 Korea and the World Economy Vol.20 No.1
This paper aims to analyze and examine the impact of ASEAN-Korea FTA on FDI flows into Korea and ASEAN countries to verify the economic validity of AKFTA. In order to analyze the impact of AKFTA on FDI, this study employs the knowledge-capital model by considering industrial development stages of countries. This study conducts panel data (2001-2012) analysis to alleviate unobserved heterogeneity and multicollinearity. The results show that the AKFTA 2006 Goods Agreement has a statistically negative effect on FDI in the member countries, while the AKFTA 2009 Investment Agreement has a positive impact on FDI in the member countries.
Tomomi Kanazawa,Shin-ichi Motoyama,Takayuki Wakayama,Hiroyuki Akinaga 한국자기학회 2007 Journal of Magnetics Vol.12 No.2
Etching of NiFe films covered with an organic photo-resist or Ti was successfully performed by an inductively coupled plasma-reactive ion etching (ICP-RIE) system using CHF₃/O₂/NH₃ discharges exchanging CHF3 for CH₄ gas gradually. Experimental results showed that the organic photo-resist mask can be applied to the NiFe etching. In the case of the Ti metal mask, it was found that the etching-selectivity Ti against NiFe was significantly varied from 7.3 to ~0 by changing CHF₃/CH₄/O₂/NH₃ to CH₄/O₂/NH₃ discharges used in the ICP-RIE system. These results show that the present RIE of NiFe was dominated by a chemical reaction rather than a physical sputtering.
Toshiya Kanazawa,Takashi Zaitsu,Masayuki Ueno,Yoko Kawaguchi 대한예방치과학회 2019 International Journal of Clinical Preventive Denti Vol.15 No.1
Objective: This study aimed to investigate the factors associated with masticatory performance, as measured with a chewing gum containing spherical resinous microparticles, and to evaluate the method by examining the relationship with self-reported masticatory status. Methods: The participants in this study comprised 903 industrial workers (mean age, 42.2±11.6 years). A questionnaire was administered to assess self-reported masticatory status. The masticatory performance score was calculated by counting the number of particles in the chewing gum. Clinical oral examinations were administered. Multiple linear regression analysis was conducted on the masticatory performance scores to examine the related factors. Analysis of covariance was conducted to investigate the association between the masticatory performance score and the self-reported masticatory status. Results: Significant predictors of the masticatory performance score were sex (p<0.001), age (p<0.001), decayed teeth (p=0.009), total-functional tooth units (p<0.001), periodontitis (p=0.003), and malocclusion (p=0.011). The relationship between the masticatory performance score and the self-reported masticatory status was attenuated after controlling for confounding factors. Conclusion: The masticatory performance increased with age and decreased as the oral health status worsened. Using this chewing gum method partly, but not comprehensively, reflects masticatory performance. Therefore, various masticatory performance- related indexes should be employed to measure masticatory performance accurately