scholarly journals Investigating inlay designs of class II cavity with deep margin elevation using finite element method

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Yung-Chung Chen ◽  
Chi-Lun Lin ◽  
Chun-Hsien Hou
Keyword(s):  
Finite Element ◽  
Stress Responses ◽  
Mechanical Performance ◽  
Material Selection ◽  
Design Guidelines ◽  
Geometric Design ◽  
Design Parameters ◽  
Element Analysis ◽  
Tooth Structure ◽  
Deep Margin

Abstract Background This study evaluates the mechanical performance of deep margin elevation technique for carious cavities by considering the shape designs and material selections of inlay using a computational approach combined with the design of experiments method. The goal is to understand the effects of the design parameters on the deep margin elevation technique and provide design guidelines from the biomechanics perspective. Methods Seven geometric design parameters for defining an inlay’s shape of a premolar were specified, and the influence of cavity shape and material selection on the overall stress distribution was investigated via automated modelling. Material selection included composite resin, ceramic, and lithium disilicate. Finite element analysis was performed to evaluate the mechanical behavior of the tooth and inlay under a compressive load. Next, the analysis of variance was conducted to identify the parameters with a significant effect on the stress occurred in the materials. Finally, the response surface method was used to analyze the stress responses of the restored tooth with different design parameters. Results The restored tooth with a larger isthmus width demonstrated superior mechanical performance in all three types of inlay materials, while the influence of other design parameters varied with the inlay material selection. The height of the deep margin elevation layer insignificantly affected the mechanical performance of the restored tooth. Conclusions A proper geometric design of inlay enhances the mechanical performance of the restored tooth and could require less volume of the natural dentin to be excavated. Furthermore, under the loading conditions evaluated in this study, the deep margin elevation layer did not extensively affect the strength of the tooth structure.

BIOMECHANICAL EVALUATION OF ENDODONTIC POST-RESTORED TEETH — FINITE ELEMENT ANALYSIS

2013 ◽  
Vol 13 (01) ◽  
pp. 1350012 ◽  
Author(s):  
KUO-CHIH SU ◽  
CHIH-HAN CHANG ◽  
SHU-FEN CHUANG ◽  
E. Y. K. NG
Keyword(s):  
Finite Element ◽  
Von Mises Stress ◽  
Design Parameters ◽  
Vertical Force ◽  
Horizontal Force ◽  
Endodontically Treated Teeth ◽  
Element Analysis ◽  
Tooth Structure ◽  
Biomechanical Behavior ◽  
Post Stress

Endodontically treated teeth are usually weak and need prosthodontic restorations. The selection and design of endodontic posts are associated with the biomechanical behavior of teeth. This study analyzed the stress in endodontically treated teeth using the finite element method. The model of a restored tooth consists of the post, core, crown, dentin, periodontal ligament, cortical bone, cancellous bone, and gingiva. The post is given various design parameters: three diameters (1.3, 1.8, and 2.3 mm), four lengths (9.7, 12.7, 15.7, and 18.7 mm), three shapes (cylindrical, tapered, and two-step cylindrical), and five materials (gold alloy, stainless steel, titanium, carbon fiber, and glass fiber). Static loads of 100 N are applied in the vertical, horizontal, and oblique directions on the incisal edge, and the generated von Mises stress is calculated. Results show that increases in the post diameter and elastic modulus decrease the post stress. The dentin stress slightly decreases with increasing post stress. The loading mode greatly affects the peak dentin stress magnitude (horizontal force (37 MPa) > oblique force (28 MPa) > vertical force (9 MPa)) and location. Furthermore, the horizontal force induces harmful bending of the tooth structure.

Finite Element Analysis of Carbon Nanotube Structured Badminton Racket

2020 ◽  
Vol 17 (11) ◽  
pp. 4980-4983
Author(s):  
K. Vidyasagar ◽  
A. Bhujanga Rao ◽  
K. Vijay Chandra ◽  
B. Gautam
Keyword(s):  
Finite Element ◽  
Carbon Nanotube ◽  
Carbon Fibers ◽  
Material Selection ◽  
Twist Angle ◽  
Strain Curve ◽  
Design Parameters ◽  
Element Analysis ◽  
Carbon Nano Tubes ◽  
Structural Failures

The deflection sensitivity of badminton racket and specific design parameters need to be considered while developing a rugged racket structure. Titanium alloys, ceramics, fibreglass and carbon fibers are using to develop badminton rackets. During swing and hit the racket for smashes, the structural failures are challenging. This paper focused on material selection to withstand to the max load applied. Armchair and Zig–Zag Carbon Nano Tubes are studied using Finite Element Modelling (FEM). The Stress–Strain curve, modulus of Elasticity, Bending Stiffness and Moment of Inertia are analysed with varying radius of the carbon nanotube. Max bend is 900 along with twist angle 500 is applied on SWCNT Structures. The harvested results are impressive with reasonably good elastic and applied loads withstand properties to elect the Zig–Zag SWCNT structures for developing the badminton rackets.

Finite Element Analysis of MOD Cavity Depth in a Restored Tooth

1999 ◽  
Author(s):  
Chun-Li Lin ◽  
Chih-Han Chang ◽  
Chau-Hsiang Wang ◽  
Huey-Er Lee
Keyword(s):  
Finite Element ◽  
Mesh Generation ◽  
Stress Gradient ◽  
Design Parameters ◽  
Cavity Preparation ◽  
Element Analysis ◽  
Cavity Depth ◽  
Tooth Structure ◽  
Cavity Design ◽  
Automatic Mesh

Abstract Numerous studies have confirmed a correlation between the restored tooth fracture and the cavity design parameters. Improper geometric design of cavity could increase the unfavorable stresses of remaining tooth structure and cause fracture. However, the quantitative guideline for cavity preparation is unclear. This study developed an automatic mesh generation tool and employed finite element method to examine the stress distribution with different cavity depth designs in class II MOD restoration. The results indicated that for deeper cavity designs the unfavorable stress gradient was evident, therefore, the existence of a pulpal wall is essential.

scholarly journals Development of Simulation Based p-Multipliers for Laterally Loaded Pile Groups in Granular Soil Using 3D Nonlinear Finite Element Model

2020 ◽  
Vol 11 (1) ◽  
pp. 26
Author(s):  
Muhammad Bilal Adeel ◽  
Muhammad Asad Jan ◽  
Muhammad Aaqib ◽  
Duhee Park
Keyword(s):  
Finite Element ◽  
Element Model ◽  
Design Guidelines ◽  
American Petroleum Institute ◽  
Winkler Foundation ◽  
Group Effect ◽  
Pile Groups ◽  
Element Analysis ◽  
Laterally Loaded Pile ◽  
Laterally Loaded

The behavior of laterally loaded pile groups is usually accessed by beam-on-nonlinear-Winkler-foundation (BNWF) approach employing various forms of empirically derived p-y curves and p-multipliers. Averaged p-multiplier for a particular pile group is termed as the group effect parameter. In practice, the p-y curve presented by the American Petroleum Institute (API) is most often utilized for piles in granular soils, although its shortcomings are recognized. In this study, we performed 3D finite element analysis to develop p-multipliers and group effect parameters for 3 × 3 to 5 × 5 vertically squared pile groups. The effect of the ratio of spacing to pile diameter (S/D), number of group piles, varying friction angle (φ), and pile fixity conditions on p-multipliers and group effect parameters are evaluated and quantified. Based on the simulation outcomes, a new functional form to calculate p-multipliers is proposed for pile groups. Extensive comparisons with the experimental measurements reveal that the calculated p-multipliers and group effect parameters are within the recorded range. Comparisons with two design guidelines which do not account for the pile fixity condition demonstrate that they overestimate the p-multipliers for fixed-head condition.

Study of material selection and design improvement for a portable blender by using finite element analysis

2021 ◽  
Author(s):  
R. M. Farizuan ◽  
A. R. Irfan ◽  
H. Radhwan ◽  
Shafeeq Ahmad Shamim Ahmad ◽  
Khoo Kin Fai ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Material Selection ◽  
Element Analysis ◽  
Design Improvement

scholarly journals Fractographical Analysis and Biomechanical Considerations of a Tooth Restored With Intracanal Fiber Post: Report of the Fracture and Importance of the Fiber Arrangements

2016 ◽  
Vol 41 (5) ◽  
pp. E149-E158 ◽  
Author(s):  
VF Wandscher ◽  
CD Bergoli ◽  
IF Limberger ◽  
TP Cenci ◽  
P Baldissara ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Glass Fiber ◽  
Shear Stresses ◽  
Fiber Post ◽  
Element Analysis ◽  
Parallel Fibers ◽  
Tooth Structure ◽  
Anterior Teeth ◽  
Compressive Stresses

SUMMARY Objective: This article aims to present a fractographic analysis of an anterior tooth restored with a glass fiber post with parallel fiber arrangement, taking into account force vectors, finite element analysis, and scanning electron microscopy (SEM). Methods: A patient presented at the Faculty of Dentistry (Federal University of Santa Maria, Brazil) with an endodontically treated tooth (ETT), a lateral incisor that had a restorable fracture. The treatment was performed, and the fractured piece was analyzed using stereomicroscopy, SEM, and finite element analysis. Results: The absence of remaining coronal tooth structure might have been the main factor for the clinical failure. We observed different stresses actuating in an ETT restored with a fiber post as well as their relationship with the ultimate fracture. Tensile, compression, and shear stresses presented at different levels inside the restored tooth. Tensile and compressive stresses acted together and were at a maximum in the outer portions and a minimum in the inner portions. In contrast, shear stresses acted concomitantly with tensile and compressive stresses. Shear was higher in the inner portions (center of the post), and lower in the outer portions. This was confirmed by finite element analysis. The SEM analysis showed tensile and compression areas in the fiber post (exposed fibers=tensile areas=lingual surface; nonexposed fibers=compression areas=buccal surface) and shear areas inside the post (scallops and hackle lines). Stereomicroscopic analysis showed brown stains in the crown/root interface, indicating the presence of microleakage (tensile area=lingual surface). Conclusion: We concluded that glass fiber posts with parallel fibers (0°), when restoring anterior teeth, present a greater fracture potential by shear stress because parallel fibers are not mechanically resistant to support oblique occlusal loads. Factors such as the presence of remaining coronal tooth structure and occlusal stability assist in the biomechanical equilibrium of stresses that act upon anterior teeth.

Finite Element Analysis on the Deformation of Energy-Saving Wire-Mesh Frame Wallboard

2014 ◽  
Vol 501-504 ◽  
pp. 731-735
Author(s):  
Li Zhang ◽  
Kang Li
Keyword(s):  
Finite Element ◽  
Energy Saving ◽  
Theoretical Basis ◽  
Steel Wire ◽  
Wire Mesh ◽  
Design Parameters ◽  
Element Analysis ◽  
Finite Element Program ◽  
Element Program ◽  
Influence Degree

This paper analyzes the influence degree of related design parameters of wire-mesh frame wallboard on deformation through finite element program, providing theoretical basis for the design and test of steel wire rack energy-saving wallboard.

Sign in / Sign up

Export Citation Format

Share Document