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Realistic kinetic loading of the jaw system during single chewing cycles: a finite element study
Author(s) -
Martinez Choy S. E.,
Lenz J.,
Schweizerhof K.,
Schmitter M.,
Schindler H. J.
Publication year - 2017
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1111/joor.12501
Subject(s) - mastication , finite element method , molar , kinematics , biting , masticatory force , bite force quotient , orthodontics , periodontal fiber , materials science , structural engineering , geology , engineering , physics , medicine , classical mechanics , paleontology
Summary Although knowledge of short‐range kinetic interactions between antagonistic teeth during mastication is of essential importance for ensuring interference‐free fixed dental reconstructions, little information is available. In this study, the forces on and displacements of the teeth during kinetic molar biting simulating the power stroke of a chewing cycle were investigated by use of a finite‐element model that included all the essential components of the human masticatory system, including an elastic food bolus. We hypothesised that the model can approximate the loading characteristics of the dentition found in previous experimental studies. The simulation was a transient analysis, that is, it considered the dynamic behaviour of the jaw. In particular, the reaction forces on the teeth and joints arose from contact, rather than nodal forces or constraints. To compute displacements of the teeth, the periodontal ligament ( PDL ) was modelled by use of an Ogden material model calibrated on the basis of results obtained in previous experiments. During the initial holding phase of the power stroke, bite forces were aligned with the roots of the molars until substantial deformation of the bolus occurred. The forces tilted the molars in the bucco‐lingual and mesio‐distal directions, but as the intrusive force increased the teeth returned to their initial configuration. The Ogden material model used for the PDL enabled accurate prediction of the displacements observed in experimental tests. In conclusion, the comprehensive kinetic finite element model reproduced the kinematic and loading characteristics of previous experimental investigations.