title: Biomechanical analysis of a temporomandibular joint condylar prosthesis during various clenching tasks.
abstract: The objective of this study was to evaluate the effect of clenching tasks on the stress and stability of a temporomandibular joint (TMJ) condylar prosthesis, as well as on the stress and strain in the whole mandible and bone surrounding three screws. Three-dimensional finite element models of the mandible and a TMJ condylar prosthesis using three screws were established. Six static clenching tasks were simulated in this study: incisal clench (INC), intercuspal position (ICP), right unilateral molar clench (RMOL), left unilateral molar clench (LMOL), right group function (RGF), and left group function (LGF). Based on the simulation of the six clenching tasks, none of the inserted screws or the TMJ condylar prosthesis were broken. In addition, the stability of the TMJ condylar prosthesis was sufficiently high for bone ongrowth. For the whole mandibular bone, the maximum von Mises stress and von Mises strain observed in the cortical bone and cancellous bone were yielded by the ICP and RMOL, respectively. For the bone surrounding the inserted screws, the maximum von Mises stress and von Mises strain in both the cortical bone and cancellous bone were yielded by the LMOL. Clenching tasks had significant effects on the stress distribution of the TMJ condylar prosthesis, as well as on the stress and strain distribution of the whole mandible and the bone surrounding the inserted screws.
authors.affiliation: School of Dentistry, College of Medicine, China Medical University, Taichung 404, Taiwan.
authors.forename: Heng-Li
authors.initials: HL
authors.lastname: Huang
authors.affiliation: Department of Medical Research, Taichung Veterans General Hospital, Taichung 407, Taiwan.
authors.forename: Kuo-Chih
authors.initials: KC
authors.lastname: Su
authors.affiliation: School of Dentistry, College of Medicine, China Medical University, Taichung 404, Taiwan; Department of Dentistry, China Medical University and Hospital, Taichung 404, Taiwan.
authors.forename: Lih-Jyh
authors.initials: LJ
authors.lastname: Fuh
authors.affiliation: School of Dentistry, College of Medicine, China Medical University, Taichung 404, Taiwan; Department of Dentistry, China Medical University and Hospital, Taichung 404, Taiwan.
authors.forename: Michael Y C
authors.initials: MY
authors.lastname: Chen
authors.affiliation: Department of Biomedical Imaging and Radiological Science, China Medical University, Taichung 404, Taiwan.
authors.forename: Jay
authors.initials: J
authors.lastname: Wu
authors.affiliation: Department of Biomedical Engineering, Hungkuang University, Taichung 433, Taiwan.
authors.forename: Ming-Tzu
authors.initials: MT
authors.lastname: Tsai
authors.affiliation: School of Dentistry, College of Medicine, China Medical University, Taichung 404, Taiwan. Electronic address: jthsu@mail.cmu.edu.tw.
authors.forename: Jui-Ting
authors.initials: JT
authors.lastname: Hsu
mesh_terms: D001732:Bite Force; D020342:Finite Element Analysis / Q000592:standards*; D006801:Humans; D008335:Mandibular Condyle / Q000503:physiopathology*; D008341:Mandibular Prosthesis; D013314:Stress, Mechanical; D013704:Temporomandibular Joint / Q000601:surgery*
keywords: Clenching tasks; Finite element method; Temporomandibular joint condylar prosthesis