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A further finite element stress analysis of angled abutments for an implant placed in the anterior maxilla.

Wu D, Tian K, Chen J, Jin H, Huang W, Liu Y - Comput Math Methods Med (2015)

Bottom Line: Response curves under oblique loading were similar in both models.With abutments angulation increased, maximum von Mises stress firstly decreased to minimum point and then gradually increased to higher level.From a biomechanical point of view, favorable peri-implant stress levels could be induced by angled abutments under oblique loading if suitable angulation of abutments was selected.

View Article: PubMed Central - PubMed

Affiliation: School of Stomatology, Fujian Medical University, Fuzhou, Fujian 350000, China ; Department of Oral Implantology, Affiliated Stomatological Hospital of Fujian Medical University, Fuzhou, Fujian 350002, China.

ABSTRACT
To systematically measure and compare the stress distribution on the bone around an implant in the anterior maxilla using angled abutments by means of finite element analysis, three-dimensional finite element simplified patient-specific models and simplified models were created and analyzed. Systematically varied angled abutments were simulated, with angulation ranging from 0° to 60°. The materials in the current study were assumed to be homogenous, linearly elastic, and isotropic. Force of 100 N was applied to the central node on the top surface of the abutments to simulate the occlusal force. To simulate axial and oblique loading, the angle of loading was 0°, 15°, and 20° to the long axis of implant, respectively. There was the strong resemblance between the response curves for simplified patient-specific models and simplified models. Response curves under oblique loading were similar in both models. With abutments angulation increased, maximum von Mises stress firstly decreased to minimum point and then gradually increased to higher level. From a biomechanical point of view, favorable peri-implant stress levels could be induced by angled abutments under oblique loading if suitable angulation of abutments was selected.

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Related in: MedlinePlus

Response curve of abutment angulation to maximum von Mises stress in cortical bone and cancellous bone under 15° oblique loading in simplified patient-specific models and simplified models.
© Copyright Policy - open-access
Related In: Results  -  Collection


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fig4: Response curve of abutment angulation to maximum von Mises stress in cortical bone and cancellous bone under 15° oblique loading in simplified patient-specific models and simplified models.

Mentions: Numerical and graphic results were generated for maximum von Mises stress. According to different jawbone models, two samples were modeled in this study. The general patterns for stress distribution (Figures 2(a) and 2(b)) were similar for all models. High stress values were located at cervical cortical bone regions adjacent to implants (Figures 2(c) and 2(d)). Relatively low stress values were identified in cancellous bone regions (Figures 2(e) and 2(f)) due to the lower elastic property of this type of bone compared to cortical bone. Variation of the maximum von Mises stress and response curves of abutments angulation versus maximum von Mises stress in simplified patient-specific models and simplified models under axial loading angle are shown in Figure 3, respectively. The response curves show the strong resemblance between simplified patient-specific models and simplified models. The magnitude of maximum von Mises stress in cortical and cancellous bone increased with an increase in the abutments angulation. In simplified models when the angulation of angled abutments was changed from 0° to 60° maximum von Mises stress increased by 75% and 117%, from 1.2 MPa to 2.1 MPa and 13.7 MPa to 29.6 MPa in cancellous and cortical bone, respectively. In simplified patient-specific models when the angulation of angled abutments was changed from 0° to 60° maximum von Mises stress increased by 94% and 116%, from 1.6 MPa to 3.1 MPa and 19.5 MPa to 42.2 MPa in cancellous and cortical bone, respectively. Variation of the maximum von Mises stress and response curves of abutments angulation versus maximum von Mises stress in simplified patient-specific models and simplified models under oblique loading (15° and 20°) are shown in Figures 4 and 5, respectively. Response curves of abutments angulation to maximum von Mises stress basically were also similar in both models. With abutments angulation increasing, maximum von Mises stress firstly decreased to minimum point and then gradually increased to higher level. In simplified models under oblique loading (15°) maximum von Mises stress in cancellous and cortical bone firstly reduced by 26% and 34%, from 1.5 MPa to 1.1 MPa and from 18.9 MPa to 12.5 MPa, and then increased to 1.5 MPa and 20.1 MPa, respectively. In simplified patient-specific models under oblique loading (15°) maximum von Mises stress in cancellous and cortical bone firstly reduced by 22% and 23%, from 1.8 MPa to 1.4 MPa and from 21.1 MPa to 16.2 MPa, and then increased to 2.1 MPa and 29.1 MPa, respectively. In simplified models under oblique loading (20°) maximum von Mises stress in cancellous and cortical bone firstly reduced by 31% and 47%, from 1.6 MPa to 1.1 MPa and from 22.4 MPa to 11.8 MPa, and then increased to 1.3 MPa and 17.1 MPa, respectively. In simplified patient-specific models under oblique loading (20°) maximum von Mises stress in cancellous and cortical bone firstly reduced by 33% and 33%, from 2.1 MPa to 1.4 MPa and from 24.5 MPa to 16.3 MPa, and then increased to 1.7 MPa and 24.1 MPa, respectively.


A further finite element stress analysis of angled abutments for an implant placed in the anterior maxilla.

Wu D, Tian K, Chen J, Jin H, Huang W, Liu Y - Comput Math Methods Med (2015)

Response curve of abutment angulation to maximum von Mises stress in cortical bone and cancellous bone under 15° oblique loading in simplified patient-specific models and simplified models.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4352728&req=5

fig4: Response curve of abutment angulation to maximum von Mises stress in cortical bone and cancellous bone under 15° oblique loading in simplified patient-specific models and simplified models.
Mentions: Numerical and graphic results were generated for maximum von Mises stress. According to different jawbone models, two samples were modeled in this study. The general patterns for stress distribution (Figures 2(a) and 2(b)) were similar for all models. High stress values were located at cervical cortical bone regions adjacent to implants (Figures 2(c) and 2(d)). Relatively low stress values were identified in cancellous bone regions (Figures 2(e) and 2(f)) due to the lower elastic property of this type of bone compared to cortical bone. Variation of the maximum von Mises stress and response curves of abutments angulation versus maximum von Mises stress in simplified patient-specific models and simplified models under axial loading angle are shown in Figure 3, respectively. The response curves show the strong resemblance between simplified patient-specific models and simplified models. The magnitude of maximum von Mises stress in cortical and cancellous bone increased with an increase in the abutments angulation. In simplified models when the angulation of angled abutments was changed from 0° to 60° maximum von Mises stress increased by 75% and 117%, from 1.2 MPa to 2.1 MPa and 13.7 MPa to 29.6 MPa in cancellous and cortical bone, respectively. In simplified patient-specific models when the angulation of angled abutments was changed from 0° to 60° maximum von Mises stress increased by 94% and 116%, from 1.6 MPa to 3.1 MPa and 19.5 MPa to 42.2 MPa in cancellous and cortical bone, respectively. Variation of the maximum von Mises stress and response curves of abutments angulation versus maximum von Mises stress in simplified patient-specific models and simplified models under oblique loading (15° and 20°) are shown in Figures 4 and 5, respectively. Response curves of abutments angulation to maximum von Mises stress basically were also similar in both models. With abutments angulation increasing, maximum von Mises stress firstly decreased to minimum point and then gradually increased to higher level. In simplified models under oblique loading (15°) maximum von Mises stress in cancellous and cortical bone firstly reduced by 26% and 34%, from 1.5 MPa to 1.1 MPa and from 18.9 MPa to 12.5 MPa, and then increased to 1.5 MPa and 20.1 MPa, respectively. In simplified patient-specific models under oblique loading (15°) maximum von Mises stress in cancellous and cortical bone firstly reduced by 22% and 23%, from 1.8 MPa to 1.4 MPa and from 21.1 MPa to 16.2 MPa, and then increased to 2.1 MPa and 29.1 MPa, respectively. In simplified models under oblique loading (20°) maximum von Mises stress in cancellous and cortical bone firstly reduced by 31% and 47%, from 1.6 MPa to 1.1 MPa and from 22.4 MPa to 11.8 MPa, and then increased to 1.3 MPa and 17.1 MPa, respectively. In simplified patient-specific models under oblique loading (20°) maximum von Mises stress in cancellous and cortical bone firstly reduced by 33% and 33%, from 2.1 MPa to 1.4 MPa and from 24.5 MPa to 16.3 MPa, and then increased to 1.7 MPa and 24.1 MPa, respectively.

Bottom Line: Response curves under oblique loading were similar in both models.With abutments angulation increased, maximum von Mises stress firstly decreased to minimum point and then gradually increased to higher level.From a biomechanical point of view, favorable peri-implant stress levels could be induced by angled abutments under oblique loading if suitable angulation of abutments was selected.

View Article: PubMed Central - PubMed

Affiliation: School of Stomatology, Fujian Medical University, Fuzhou, Fujian 350000, China ; Department of Oral Implantology, Affiliated Stomatological Hospital of Fujian Medical University, Fuzhou, Fujian 350002, China.

ABSTRACT
To systematically measure and compare the stress distribution on the bone around an implant in the anterior maxilla using angled abutments by means of finite element analysis, three-dimensional finite element simplified patient-specific models and simplified models were created and analyzed. Systematically varied angled abutments were simulated, with angulation ranging from 0° to 60°. The materials in the current study were assumed to be homogenous, linearly elastic, and isotropic. Force of 100 N was applied to the central node on the top surface of the abutments to simulate the occlusal force. To simulate axial and oblique loading, the angle of loading was 0°, 15°, and 20° to the long axis of implant, respectively. There was the strong resemblance between the response curves for simplified patient-specific models and simplified models. Response curves under oblique loading were similar in both models. With abutments angulation increased, maximum von Mises stress firstly decreased to minimum point and then gradually increased to higher level. From a biomechanical point of view, favorable peri-implant stress levels could be induced by angled abutments under oblique loading if suitable angulation of abutments was selected.

Show MeSH
Related in: MedlinePlus