A 3D numerical simulation of stress distribution and fracture process in a zirconia‐based FPD framework

Kou, Wen; Li, Decong; Qiao, Jiyan; Chen, Li; Ding, Yansheng; Sjögren, Göran

doi:10.1002/jbm.b.31782

Cited by 7 publications

(10 citation statements)

References 25 publications

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“…In the present study the main fracture mechanism in the three-unit c-FPD framework could be identified as tensile stress failure and the crucial location for fracture was identified as being in the gingival embrasure. These findings are in agreement with those in previous numerical simulation analyses (Kelly , 1995;Kou et al, 2007;Dittmer et al, 2009;Kou et al, 2011). However, one unique feature in the present 3D numerical simulation is the possibility it offers to follow the whole fracture process from beginning to end (Fig.…”

Section: Discussionsupporting

confidence: 93%

“…Comparison the results obtained in the earlier 3D numerical simulation study (Kou et al, 2011) with a previous laboratory test (Sundh et al, 2005) reveals that the fracture patterns in the numerical study and the laboratory test were in agreement with each other. In both studies the fracture went between one of the connectors and diagonally through the loading point and no fracture could be observed in the abutments.…”

Section: Validation Of the Numerical Simulationsupporting

confidence: 72%

“…In both studies the fracture went between one of the connectors and diagonally through the loading point and no fracture could be observed in the abutments. Moreover, comparison between the two studies shows that the fracture pattern in the gingival part in the 3D numerical simulation (Kou et al, 2011) correlated well to the laboratory test (Sundh et al, 2005) and a compression curl could be seen in both the 3D numerical simulation and the laboratory test. The results in the previous 3D numerical study (Kou et al, 2011) were also compared with a previous fractographic analysis ( Kou and Sjögren, 2010).…”

Section: Validation Of the Numerical Simulationmentioning

confidence: 64%

“…Moreover, comparison between the two studies shows that the fracture pattern in the gingival part in the 3D numerical simulation (Kou et al, 2011) correlated well to the laboratory test (Sundh et al, 2005) and a compression curl could be seen in both the 3D numerical simulation and the laboratory test. The results in the previous 3D numerical study (Kou et al, 2011) were also compared with a previous fractographic analysis ( Kou and Sjögren, 2010). The fracture initiation sites in the fractographic analysis were similar as in the previous 3D numerical modeling, the fracture mechanism was tensile failure and the fracture initiation was identified in the right gingival portion of the framework.…”

Section: Validation Of the Numerical Simulationmentioning

confidence: 64%

“…The vast development in computer technology means that the calculation speed has increased, leading to extended applications of the numerical method (Holberg et al, 2013;Lee and Lim, 2013;Papanicolaou et al, 2015). In a previous paper, a three-dimensional (3D) numerical simulation was applied to studying the fracture process in a three-unit dental c-FPD framework under perpendicular mechanical loading towards the occlusal surface (Kou et al, 2011). The fracture in the previous numerical simulation test largely correlated with the patterns of the results in a corresponding laboratory test (Sundh et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Numerical simulation of the fracture process in ceramic FPD frameworks caused by oblique loading

Kou

Qiao

Chen

et al. 2015

Journal of the Mechanical Behavior of Biomedical Materials

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Finite element analysisFixed partial denture Fracture process Numerical simulationOblique loading a b s t r a c t Using a newly developed three-dimensional (3D) numerical modeling code, an analysis was performed of the fracture behavior in a three-unit ceramic-based fixed partial denture (FPD) framework subjected to oblique loading. All the materials in the study were treated heterogeneously; Weibull's distribution law was applied to the description of the heterogeneity. The Mohr-Coulomb failure criterion with tensile strength cut-off was utilized in judging whether the material was in an elastic or failed state. The simulated loading area was placed either on the buccal or the lingual cusp of a premolar-shaped pontic with the loading direction at 301, 451, 601, 751 or 901 angles to the occlusal surface. The stress distribution, fracture initiation and propagation in the framework during the loading and fracture process were analyzed. This numerical simulation allowed the cause of the framework fracture to be identified as tensile stress failure. The decisive fracture was initiated in the gingival embrasure of the pontic, regardless of whether the buccal or lingual cusp of the pontic was loaded. The stress distribution and fracture propagation process of the framework could be followed step by step from beginning to end. The bearing capacity and the rigidity of the framework vary with the loading position and direction. The framework loaded with 901 towards the occlusal surface has the highest bearing capacity and the greatest rigidity. The framework loaded with 301 towards the occlusal surface has the least rigidity indicating that oblique loading has a major impact on the fracture of ceramic frameworks.& 2015 Elsevier Ltd. All rights reserved. IntroductionCeramics are among the most inert biomaterials known. Their advantages include high biocompatibility (Depprich et al., 2008), good esthetic appearance (Ghazal et al., 2008), low solubility and low thermal conductivity (Chai et al., 2007). Among the crucial problems for ceramics, however, are low fracture resistance and brittleness and, consequently, no or little apparent plastic deformation can occur before fracture (Munz and Fett, 1999 j o u r n a l o f t h e m e c h a n i c a l b e h a v i o r o f b i o m e d i c a l m a t e r i a l s 5 0 ( 2 0 1 5 ) 2 0 6 -2 1 4

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Section: Discussionsupporting

confidence: 93%

Section: Validation Of the Numerical Simulationsupporting

confidence: 72%

Section: Validation Of the Numerical Simulationmentioning

confidence: 64%

Section: Validation Of the Numerical Simulationmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

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Numerical simulation of the fracture process in ceramic FPD frameworks caused by oblique loading

Kou

Qiao

Chen

et al. 2015

Journal of the Mechanical Behavior of Biomedical Materials

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Fracture resistance of three-unit zirconia fixed partial denture with modified framework

et al. 2016

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Obtaining ideal prosthetic framework design is at times hindered by anatomical limitations in the posterior region that might increase the risk for zirconia restoration fracture. Modification such as increasing the bulk thickness especially in the connector region could result in strengthening the zirconia framework. Three-unit zirconia fixed partial dentures replacing mandibular molars were fabricated using the following two techniques: CAD/CAM technology and manual copy milling. Modified framework with unveneered full thickness connectors were designed and fabricated with the aforementioned methods. Conventional frameworks (0.5 mm thick with rounded 3 mm connectors) served as control (N = 20). After cementation on epoxy dies, the frameworks were loaded to fracture in a universal testing machine. Fractured surfaces were prepared for examination using scanning electron microscopy. Statistical analysis revealed significant differences in fracture resistance between conventional and modified framework design for both fabrication techniques tested. SEM examination indicated that critical crack originated at the tensile surface of the connectors for conventional frameworks. The critical crack for modified frameworks occurred on the axial wall of the abutments. The modification of the zirconia framework design presented significant improvement of the fracture resistance compared to the conventional design.

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Influence of various materials on biomechanical behavior of endocrown-restored, endodontically-treated mandibular first molar: A 3D-finite element analysis

Chen

et al. 2015

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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To evaluate the effect of restorative materials on stress distribution of endodontically treated teeth, the 3D models of an endodontically treated mandibular fi rst molar, restoration, and cement layer were created. Three different materials (composite resin, ceramage and ceramic) were studied and two loading conditions (vertical and oblique load) were simulated. Mohr-Coulomb failure criterion of enamel, dentine, endocrown and cement were evaluated separately. It is indicated that under both loading conditions, the highest values of Mohr-Coulomb failure criterion were observed in Ceramage-restored group for remaining tooth structure while in ceramic-restored group for the restoration. Compared to composite resin and Ceramage, ceramic endocrown transferred less stress, namely was more protective to the tooth structure.

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A 3D numerical simulation of stress distribution and fracture process in a zirconia‐based FPD framework

Cited by 7 publications

References 25 publications

Numerical simulation of the fracture process in ceramic FPD frameworks caused by oblique loading

Numerical simulation of the fracture process in ceramic FPD frameworks caused by oblique loading

Fracture resistance of three-unit zirconia fixed partial denture with modified framework

Influence of various materials on biomechanical behavior of endocrown-restored, endodontically-treated mandibular first molar: A 3D-finite element analysis

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