Biomechanical behavior and Weibull survival of CAD-CAM endocrowns with different marginal designs: A 3D finite element analysis

AboElhassan, Rewaa G.; Watts, David C.; Alamoush, Rasha A.; Elraggal, Alaaeldin

doi:10.1016/j.dental.2023.11.012

Cited by 2 publications

(3 citation statements)

References 51 publications

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“…The study by AboElhassan et al found that the stresses in the dentin of the shoulder type were higher than that of the butt-joint type, which may be due to the difference in tooth preparation. AboElhassan’s study was prepared horizontally at 2 mm supragingival to the cementoenamel junction, with less enamel remaining [ 37 ], while this study only lowered 1.5 mm of space on the occlusal surface for restoration design, retaining more enamel and dentin, so that more of the stresses were shared by the enamel.…”

Section: Discussionmentioning

confidence: 99%

Effect of margin designs and loading conditions on the stress distribution of endocrowns: a finite element analysis

Zeng,

Luo,

et al. 2024

BMC Oral Health

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Background Margin designs and loading conditions can impact the mechanical characteristics and survival of endocrowns. Analyzing the stress distribution of endocrowns with various margin designs and loading conditions can provide evidence for their clinical application. Methods Three finite element analysis models were established based on the margin designs: endocrown with a butt-joint type margin (E0), endocrown with a 90° shoulder (E90), and endocrown with a 135° shoulder (E135). The E0 group involved lowering the occlusal surface and preparing the pulp chamber. The E90 group created a 90° shoulder on the margin of model E0, measuring 1.5 mm high and 1 mm wide. The E135 group featured a 135° shoulder. The solids of the models were in fixed contact with each other, and the materials of tooth tissue and restoration were uniform, continuous, isotropic linear elasticity. Nine static loads were applied, with a total load of 225 N, and the maximum von Mises stresses and stress distribution were calculated for teeth and endocrowns with different margin designs. Results Compared the stresses of different models under the same loading condition. In endocrowns, when the loading points were concentrated on the buccal side, the maximum von Mises stresses were E0 = E90 = E135, and when there was a lingual loading, they were E0 < E90 = E135. In enamel, the maximum von Mises stresses under all loading conditions were E0 > E90 > E135. In dentin, the maximum von Mises stresses of the three models were basically similar except for load2, load5 and load9. Compare the stresses of the same model under different loading conditions. In endocrowns, stresses were higher when lingual loading was present. In enamel and dentin, stresses were higher when loaded obliquely or unevenly. The stresses in the endocrowns were concentrated in the loading area. In enamel, stress concentration occurred at the cementoenamel junction. In particular, E90 and E135 also experienced stress concentration at the shoulder. In dentin, the stresses were mainly concentrated in the upper section of the tooth root. Conclusion Stress distribution is similar among the three margin designs of endocrowns, but the shoulder-type designs, especially the 135° shoulder, exhibit reduced stress concentration.

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Section: Discussionmentioning

confidence: 99%

Effect of margin designs and loading conditions on the stress distribution of endocrowns: a finite element analysis

Zeng,

Luo,

et al. 2024

BMC Oral Health

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“…Similar to composite materials, bone has directional dependency under external loads [23][24][25][26][27][28], which makes it crucial yet challenging to accurately simulate using traditional computer-aided design (CAD) models [29][30][31]. These conventional models, which frequently assume isotropic or orthotropic features, considerably simplify the complex behavior of human cancellous bone.…”

Section: Introductionmentioning

confidence: 99%

“…The finite element method (FEM) is used in this study to improve the mechanobiology analysis of dental implants [1,20,21,24,[29][30][31][32][34][35][36][37]44,[46][47][48][49]. FEM is a well-known computer method for modeling and analyzing complex physical events by breaking a continuum into a few discrete parts.…”

Section: Introductionmentioning

confidence: 99%

Advancing 3D Dental Implant Finite Element Analysis: Incorporating Biomimetic Trabecular Bone with Varied Pore Sizes in Voronoi Lattices

Alemayehu,

Todoh,

Huang

2024

JFB

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The human mandible’s cancellous bone, which is characterized by its unique porosity and directional sensitivity to external forces, is crucial for sustaining biting stress. Traditional computer- aided design (CAD) models fail to fully represent the bone’s anisotropic structure and thus depend on simple isotropic assumptions. For our research, we use the latest versions of nTOP 4.17.3 and Creo Parametric 8.0 software to make biomimetic Voronoi lattice models that accurately reflect the complex geometry and mechanical properties of trabecular bone. The porosity of human cancellous bone is accurately modeled in this work using biomimetic Voronoi lattice models. The porosities range from 70% to 95%, which can be achieved by changing the pore sizes to 1.0 mm, 1.5 mm, 2.0 mm, and 2.5 mm. Finite element analysis (FEA) was used to examine the displacements, stresses, and strains acting on dental implants with a buttress thread, abutment, retaining screw, and biting load surface. The results show that the Voronoi model accurately depicts the complex anatomy of the trabecular bone in the human jaw, compared to standard solid block models. The ideal pore size for biomimetic Voronoi lattice trabecular bone models is 2 mm, taking in to account both the von Mises stress distribution over the dental implant, screw retention, cortical bone, cancellous bone, and micromotions. This pore size displayed balanced performance by successfully matching natural bone’s mechanical characteristics. Advanced FEA improves the biomechanical understanding of how bones and implants interact by creating more accurate models of biological problems and dynamic loading situations. This makes biomechanical engineering better.

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Biomechanical behavior and Weibull survival of CAD-CAM endocrowns with different marginal designs: A 3D finite element analysis

Cited by 2 publications

References 51 publications

Effect of margin designs and loading conditions on the stress distribution of endocrowns: a finite element analysis

Effect of margin designs and loading conditions on the stress distribution of endocrowns: a finite element analysis

Advancing 3D Dental Implant Finite Element Analysis: Incorporating Biomimetic Trabecular Bone with Varied Pore Sizes in Voronoi Lattices

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