scholarly journals Effect of the acrylic occlusal device on the stress distribution in the external hexagon implant in situations of dental tightening. A 3D finite element analysis

2021 ◽  
Vol 10 (6) ◽  
pp. e33610615601
Author(s):  
Victor Eduardo de Souza Batista ◽  
Lorena Scaioni Silva ◽  
Anderson Catelan ◽  
Carolina Santinoni dos Santos ◽  
Aljomar José Vechiato-Filho ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
3D Models ◽  
Element Analysis ◽  
3D Finite Element ◽  
3D Finite Element Analysis ◽  
Posterior Maxilla ◽  
Von Mises ◽  
Reducing Stress

The aim in the present study was to analyze the stress in the external hexagon implant (EH) in a situation of parafunction on three-unit implant-supported prostheses with and without the use of the acrylic occlusal device (AOD) using three-dimensional (3D) finite element analysis (FEA). Eight 3D models referring to the posterior maxilla with three EH supporting single and or splinted screwed metal-ceramic restoration and use of the AOD. AOD was modeled with a thickness of 2 mm. EHs were analyzed using von Mises criteria in the ANSYS 19.2 program. AOD showed to be effective in reducing stress in the EH. However, the use of the AOD was not effective enough to suggest the non-splinting of EH dental implant. The association of splinting and the use of an AOD in the posterior region of the maxilla may be an effective way to decrease the stress in the EH implant in a situation of parafunction.

Maxillary sinus pneumatization and augmentation: A three-dimensional finite element analysis

2021 ◽  
Vol 11 (11) ◽  
pp. 1892-1900
Author(s):  
Yanbo Jiang ◽  
Ming Gong ◽  
Donghui Chen ◽  
Jiaojie Li ◽  
Hailun Zhou ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Bone Graft ◽  
Maxillary Sinus ◽  
Three Dimensional ◽  
Element Analysis ◽  
3D Finite Element ◽  
Dimensional Finite Element ◽  
Von Mises ◽  
Three Dimensional Finite Element

This study aimed to explore the biomechanical behaviors of maxillary sinus elevation with bone grafts of various heights and widths using three-dimensional (3D) finite element analysis. We constructed 27 3D finite element models according to bone graft dimensions for three maxillary sinuses. These models were classified as (i) tapered, (ii) ovoid, and (iii) square. Each maxillary sinus type was analyzed with bone graft heights of 3 mm, 6 mm, and 9 mm and mesiodistal bone graft widths of 8 mm, 10 mm, and 12 mm. Different sinus pressure of 100 Pa, 500 Pa, and 1,000 Pa was applied to each aspect of the maxillary sinus. The maximum von Mises (max-VM) stress for each bone graft model was highest in the square group. The bone graft’s max-VM stress was decreased while increasing bone graft height from 3 to 9 mm in the tapered and square groups. In the ovoid group, the max-VM stress of all bone graft models decreased when the bone graft height increased from 3 to 6 mm. Thus 6 mm is the most appropriate bone graft height for all types of maxillary sinus elevation.

scholarly journals Evaluating the performance of hollow stems used in total hip replacement by 3D finite element analysis

2020 ◽  
Vol 175 ◽  
pp. 12004 ◽  
Author(s):  
Ghais Kharmanda ◽  
Imad Antypas ◽  
Aleksey Dyachenko
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Von Mises Stress ◽  
Element Analysis ◽  
3D Finite Element ◽  
3D Finite Element Analysis ◽  
Topology And Shape Optimization ◽  
Von Mises ◽  
Austin Moore ◽  
A Performance

A 3D finite element analysis is carried out to evaluate the performance of our different developed hollow stems compared to the classical solid one. The hollow stems were developed considering the topology and shape optimization. Three types of optimized hollow stems were provided: KAD (Kharmanda-Antypas-Dyachenko) stem with a single hole, OAM (Optimized Austin-Moore) stem with double holes and IAM (Improved Austin-Moore) stem with three holes. A multi-objective formulation was developed as a performance scale for all kinds of studied stems (solid and hollow). This study is carried out according to the daily loading cases and considering that all used components (ball, stem, cortical and cancellous) are assumed to be made of isotropic and homogeneous materials. In the numerical applications, it is first shown the significant advantage of the three hollow stems compared to the solid one considering a performance function scale. Next, when comparing all hollow stems (KAD, OAM and IAM) in details, it is shown that the KAD stem for the daily loading cases, leads to the most homogeneous von-Mises stress distribution in both cortical and cancellous tissues.

scholarly journals Effect of Direct and Indirect Materials on Stress Distribution in Class II MOD Restorations: A 3D-Finite Element Analysis Study

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Şemsi Alp ◽  
Laden Gulec Alagoz ◽  
Nuran Ulusoy
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Class Ii ◽  
Element Analysis ◽  
3D Finite Element ◽  
3D Finite Element Analysis ◽  
3D Cad ◽  
Restorative Materials ◽  
Cad Cam ◽  
Von Mises

The aim of this study is to investigate the stress distributions of different restoration options for class II mesio-occluso-distal (MOD) cavities. A class II MOD cavity with proximal box gingival floor 1 mm below cementoenamel junction was designed in a mandibular first molar tooth model. 3D finite-element analysis (FEA) and 3D-CAD modelling were used to examine the occlusal stresses distributed to the remaining buccal enamel (RBE), remaining lingual enamel (RLE), adhesive surfaces, and restorative materials by direct and indirect materials resulting from a 600 N of static occlusal load stimulating foodstuff. von Mises (VM) and maximum principal (Pmax) stresses were evaluated for two CAD/CAM materials and three direct materials. CAD/CAM materials exerted less stress than the direct restorative materials. Significant von Mises and Pmax stress value differences were seen among all restoration models on RBE. Reducing RLE and including it into the cavity would be a more effective option for this model in this scenario. As VM and Pmax stresses of PIHC CAD/CAM material for RBE and dentin were significantly lower than other tested materials, it may be the choice of material for indirect MOD restorations.

scholarly journals Retention System and Splinting on Morse Taper Implants in the Posterior Maxilla by 3D Finite Element Analysis

2018 ◽  
Vol 29 (1) ◽  
pp. 30-35 ◽  
Author(s):  
Cleidiel Aparecido Araujo Lemos ◽  
Fellippo Ramos Verri ◽  
Joel Ferreira Santiago Júnior ◽  
Daniel Augusto de Faria Almeida ◽  
Victor Eduardo de Souza Batista ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Bone Tissue ◽  
Stress Distributions ◽  
Element Analysis ◽  
3D Finite Element ◽  
3D Finite Element Analysis ◽  
Posterior Maxilla ◽  
Oblique Loading

Abstract The purpose of this study was to evaluate different retention systems (cement- or screw-retained) and crown designs (non-splinted or splinted) of fixed implant-supported restorations, in terms of stress distributions in implants/components and bone tissue, by 3-dimensional (3D) finite element analysis. Four 3D models were simulated with the InVesalius, Rhinoceros 3D, and SolidWorks programs. Models were made of type III bone from the posterior maxillary area. Models included three 4.0-mm-diameter Morse taper (MT) implants with different lengths, which supported metal-ceramic crowns. Models were processed by the Femap and NeiNastran programs, using an axial force of 400 N and oblique force of 200 N. Results were visualized as the von Mises stress and maximum principal stress (σmax). Under axial loading, there was no difference in the distribution of stress in implants/components between retention systems and splinted crowns; however, in oblique loading, cemented prostheses showed better stress distribution than screwed prostheses, whereas splinted crowns tended to reduce stress in the implant of the first molar. In the bone tissue cemented prostheses showed better stress distribution in bone tissue than screwed prostheses under axial and oblique loading. The splinted design only had an effect in the screwed prosthesis, with no influence in the cemented prosthesis. Cemented prostheses on MT implants showed more favorable stress distributions in implants/components and bone tissue. Splinting was favorable for stress distribution only for screwed prostheses under oblique loading.

Effect of Splinting of Tilted External Hexagon Implants on 3‐Unit Implant‐Supported Prostheses in the Posterior Maxilla: A 3D Finite Element Analysis

2021 ◽  
Author(s):  
Daniel A. Faria Almeida ◽  
Fellippo R. Verri ◽  
Cleidiel A. A. Lemos ◽  
Victor E. Souza Batista ◽  
Joel. F. Santiago Júnior ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Element Analysis ◽  
3D Finite Element ◽  
3D Finite Element Analysis ◽  
Posterior Maxilla

scholarly journals Influence of Resin Cement Thickness and Elastic Modulus on the Stress Distribution of Zirconium Dioxide Inlay-Bridge: 3D Finite Element Analysis

Polymers ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3863
Author(s):  
Joseph Assaf ◽  
Louis Hardan ◽  
Cynthia Kassis ◽  
Rim Bourgi ◽  
Walter Devoto ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Zirconium Dioxide ◽  
Clinical Performance ◽  
Three Dimensional ◽  
Resin Cement ◽  
Element Analysis ◽  
3D Finite Element ◽  
3D Finite Element Analysis

The mechanical properties and the thickness of the resin cement agents used for bonding inlay bridges can modify the clinical performance of the restoration such as debonding or prosthetic materials fracture. Thus, the aim of this study was to evaluate the stress distribution and the maximum strain generated by resin cements with different elastic moduli and thicknesses used to cement resin-bonded fixed partial denture (RBFPD). A three-dimensional (3D) finite element analysis (FEA) was used, and a 3D model was created based on a Cone-Beam Computed Tomography system (CBCT). The model was analyzed by the Ansys software. The model fixation occurred at the root of the abutment teeth and an axial load of 300 N was applied on the occlusal surface of the pontic. The highest stress value was observed for the Variolink 0.4 group (1.76 × 106 Pa), while the lowest was noted for the Panavia 0.2 group (1.07 × 106 Pa). Furthermore, the highest total deformation value was found for the Variolink 0.2 group (3.36 × 10−4 m), while the lowest was observed for the Panavia 0.4 group (2.33 × 10−4 m). By means of this FEA, 0.2 mm layer Panavia F2.0 seemed to exhibit a more favorable stress distribution when used for cementation of posterior zirconium-dioxide-based RBFPD. However, both studied materials possessed clinically acceptable properties.

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