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Baek, Sun-Hye,Cha, Hyun-Suk,Cha, Jung-Yul,Moon, Yoon-Shik,Sung, Sang-Jin The Korean Association Of Orthodontists 2012 대한치과교정학회지 Vol.42 No.4
Objective: The aims of this study were to investigate mandibular deformation under clenching and to estimate its effect on the stability of orthodontic mini-implants (OMI). Methods: Three finite element models were constructed using computed tomography (CT) images of 3 adults with different mandibular plane angles (A, low; B, average; and C, high). An OMI was placed between #45 and #46 in each model. Mandibular deformation under premolar and molar clenching was simulated. Comparisons were made between peri-orthodontic mini-implant compressive strain (POMI-CSTN) under clenching and orthodontic traction forces (150 g and 200 g). Results: Three models with different mandibular plane angles demonstrated different functional deformation characteristics. The compressive strains around the OMI were distributed mesiodistally rather than occlusogingivally. In model A, the maximum POMI-CSTN under clenching was observed at the mesial aspect of #46 (1,401.75 microstrain [${\mu}E$]), and similar maximum POMI-CSTN was observed under a traction force of 150 g (1,415 ${\mu}E$). Conclusions: The maximum POMI-CSTN developed by clenching failed to exceed the normally allowed compressive cortical bone strains; however, additional orthodontic traction force to the OMI may increase POMI-CSTN to compromise OMI stability.
차용백(Cha, Young-Baek),조광민(Cho, Kwang-Min),권일권(Kwon, Il-Kwon) 한국사회체육학회 2016 한국사회체육학회지 Vol.0 No.66
The purpose of this study is to figure out the process of becoming a mania in outdoor camping participants using grounded theoric approach. Research participants were nine general camping participants selected by reputational sampling method. Nine participants were those who usually participated in camping club or voluntary participants. The data for this study included participants observation and in-depth interview. This study categorized the coding paradigm which was presented by using the findings derived from data into casual condition, context, phenomenon, intervening conditions, interaction and the consequences to draw out the process of becoming a camping mania and its significances. The results were as follows. First, research participants’ casual conditions were internal factors and external factors. Second, research participants felt financial burden, personal relationship and environmental restrictions. They endured the burden through maximize satisfaction. Third, the more they participated in active leisure experiences, the more they developed into mania.
Three-dimensional finite element analysis of the deformation of the human mandible
Sun-Hye Baek,Hyun-Suk Cha,Jung-Yul Cha,Yoon-Shik Moon,Sang-Jin Sung 대한치과교정학회 2012 대한치과교정학회지 Vol.42 No.4
Objective: The aims of this study were to investigate mandibular deformation under clenching and to estimate its effect on the stability f orthodontic mini-implants (OMI). Methods: Three finite element models were constructed using computed tomography (CT) images of 3 adults with different mandibular plane angles (A, low; B, average; and C, high). An OMI was placed between #45 and #46 in each model. Mandibular deformation under premolar and molar clenching was simulated. Comparisons were made between peri-orthodontic mini-implant compressive strain (POMI-CSTN) under clenching and orthodontic traction forces (150 g and 200 g). Results: Three models with different mandibular plane angles demonstrated different functional deformation characteristics. The compressive strains around the OMI were distributed mesiodistally rather than occlusogingivally. In model A, the maximum POMI-CSTN under clenching was observed at the mesial aspect of #46 (1,401.75 microstrain [μE]), and similar maximum POMI-CSTN was observed under a traction force of 150 g (1,415 μE). Conclusions: The maximum POMI-CSTN developed by clenching failed to exceed the normally allowed compressive cortical bone strains; however, additional orthodontic traction force to the OMI may increase POMI-CSTN to compromise OMI stability.