Fig. 8. Distribution of occlusal force in models. a Im67, b Im6, c Im4567, d Im456, e MT67, and f MT7. R right TMJ, L left TMJ, 4 first premolar, 5 second premolar, 6 first molar, and 7 second molar. Numbers within circles indicate implant superstructure
Fig. 8. Distribution of occlusal force in models. a Im67, b Im6, c Im4567, d Im456, e MT67, and f MT7. R right TMJ, L left TMJ, 4 first prem...
Fig. 7. Initializing models altering the load displacement curves of springs
Fig. 7. Initializing models altering the load displacement curves of springs
Fig. 6. Springs for opposing teeth and TMJs and load directions. Arrows indicate loads, arrowheads indicate restricted nods, and spiral lines indicate springs
Fig. 6. Springs for opposing teeth and TMJs and load directions. Arrows indicate loads, arrowheads indicate restricted nods, and spiral lines indicate springs
Fig. 5. Distribution of occlusal force in the natural teeth model displayed in Fig.4
Fig. 5. Distribution of occlusal force in the natural teeth model displayed in Fig.4
Fig. 4. Three-dimensional finite element model with natural teeth and no defect
Fig. 4. Three-dimensional finite element model with natural teeth and no defect
Fig. 3. Load displacement curves of natural teeth in FE model
Fig. 3. Load displacement curves of natural teeth in FE model
Fig. 2. Load displacement curves of springs
Fig. 2. Load displacement curves of springs
Fig. 1. Three-dimensional finite element model. The tooth roots and implant bodies are displayed with permeability. a Im67, b Im6, c Im4567, d Im456, e MT67, and f MT7
Fig. 1. Three-dimensional finite element model. The tooth roots and implant bodies are displayed with permeability. a Im67, b Im6, c Im4567, d Im456, e MT67, and f MT7
Material
Modulus of elasticity (MPa)
Poisson ratio
References
Cortical bone
140,000
...
Yoshitani, M., Takayama, Y. & Yokoyama, A. Significance of mandibular molar replacement with a dental implant: a theoretical study with nonlinear finite element analysis.
Int J Implant Dent 4, 4 (2018). https://doi.org/10.1186/s40729-018-0117-7
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Received: 13 March 2017
Accepted: 08 January 2018
Published: 27 February 2018
DOI: https://doi.org/10.1186/s407...
Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were m...
Author Masazumi Yoshitani, Yoshiyuki Takayama, and Atsuro Yokoyama state that there are no competing interests.
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Division of Oral Functional Science, Department of Oral Functional Prosthodontics, Graduate School of Dental Medicine, Hokkaido University, Kita-13, Nishi-7, Kita-ku, Sapporo, 060-8648, Japan
Masazumi Yoshitani & Atsuro Yokoyama
Removable Prosthodontics, Hokkaido University Hospital, Hokkaido University, Kita-14, Nishi-5, Kita-Ku, Sapporo, 060-8648, Japan
Yoshiyuki Takayama
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Within the limitations of this theoretical study, we demonstrated that restoration with the same number of implants as missing teeth shows almost symmetric occlusal force distribution, and it produced less biomechanically stress for a unilateral defect of the mandible. However, if restoration of a missing second molar with an implant is impossible or difficult, then an SDA with implants may also b...
It should be noted that our results were obtained under conditions of vertical loading by bilaterally balanced muscle activity with tight intercuspation in the correct mandibular position because the horizontal displacement of the premolars and molars was restrained. The actual distribution of occlusal forces may differ due to individual differences in the material properties of the soft tissue. A...
Occlusal adjustment is usually performed to obtain symmetrical occlusal force distribution in natural dentition. However, occlusal force distribution among natural teeth and implants depends on occlusal force because of the difference of displaceability between a natural tooth and an implant [14, 15]. Therefore, we evaluated the result of the analysis from viewpoints of symmetry of occlusal force ...
FEA is useful for mechanical simulations of a living body and has been used in implant dentistry research under careful consideration of the analysis conditions [32, 33]. Although some reports have demonstrated that bone density varies according to bone type and location, the material properties of the mandible were homogenous and isotropic in this study. However, the effect of this difference was...
In model Im456 (Fig. 8d), under loads 100 and 200 N, the occlusal force at the premolars on the defect side was larger than that in model Im4567 (shown in Fig. 8c). The occlusal force was also larger than that in model MT7 (shown in Fig. 6f). However, the occlusal force at the second premolar under load 200 N was 34.5 N, which was slightly smaller than the occlusal force at the second molar ...
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The surface of the mandible was generated using measurements of a commercially available model (QS7, SOMSO) of the dentate mandible with a 3...
From the viewpoint of occlusal force distribution, when a second molar defect remains without prosthesis, the force might concentrate in the implant, residual teeth, or temporomandibular joints (TMJs). Therefore, the aim of this study was to investigate occlusal force distribution in SDA in the mandible with/without an implant using a three-dimensional (3D) finite element model (FEM).
Dental implant treatment has been frequently applied in dental practice as the most important prosthodontic procedure with long-term predictability to restore oral function, maintain occlusion, and improve the quality of life (QoL) of a patient [1]. Clinically, dental implants are mainly applied to correct mandibular distally extended edentulism [2]. However, implant placement in the molar region ...
Dental implants are frequently applied to unilateral defects in the mandible. However, implant placement in the molar region of the mandible can be difficult due to anatomical structure. The aim of this study was to evaluate the distribution of occlusal force in a mandibular shortened dental arch (SDA) with implants.
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