Development and evaluation of a jaw-tracking system for mice: reconstruction of three-dimensional movement trajectories on an arbitrary point on the mandible

BioMedical Engineering OnLine

Go Yasuda¹  Haruka Kohara¹  Noriaki Yoshida¹  Ryo Hamanaka¹  Emi Moriuchi¹  Yoshiyuki Koga²  Ayumi Fujishita²  Tomoko Yoshimi² 

[1] 0000 0000 8902 2273, grid.174567.6, Department of Orthodontics and Dentofacial Orthopedics, Graduate School of Biomedical Sciences, Nagasaki University, 1-7-1 Sakamoto, 852-8588, Nagasaki, Japan;0000 0004 0616 1585, grid.411873.8, Department of Orthodontics, Nagasaki University Hospital, 1-7-1 Sakamoto, 852-8588, Nagasaki, Japan;

关键词: Motion capture;    Jaw movements;    Mastication;    Mouse;    Rigid transformation;   

DOI  :  10.1186/s12938-019-0672-z

来源: publisher

【 摘 要 】

BackgroundMastication is one of the most fundamental functions for the conservation of life. The demand for devices for evaluating stomatognathic function, for instance, recording mandibular movements or masticatory muscle activities using animal models, has been increasing in recent years to elucidate neuromuscular control mechanisms of mastication and to investigate the etiology of oral motor disorders. To identify the fundamental characteristics of the jaw movements of mice, we developed a new device that reconstructs the three-dimensional (3D) movement trajectories on an arbitrary point on the mandible during mastication.MethodsFirst, jaw movements with six degrees of freedom were measured using a motion capture system comprising two high-speed cameras and four reflective markers. Second, a 3D model of the mandible including the markers was created from micro-computed tomography images. Then, the jaw movement trajectory on the certain anatomical point was reproduced by integrating the kinematic data of the jaw movements with the geometric data of the mandible.ResultsThe 3D movements at any points on the mandible, such as the condyle, molar, and incisor during mastication, could be calculated and visualized with an accuracy > 0.041 mm in 3D space. The masticatory cycle was found to be clearly divided into three phases, namely, the opening, closing, and occlusal phases in mice.ConclusionsThe proposed system can reproduce and visualize the movements of internal anatomical points such as condylar points precisely by combining kinematic data with geometric data. The findings obtained from this system could facilitate our understanding of the pathogenesis of eating disorders or other oral motor disorders when we could compare the parameters of stomatognathic function of normal mice and those of genetically modified mice with oral behavioral dysfunctions.

【 授权许可】

CC BY