scholarly journals Resistance fracture of minimally prepared endocrowns made by three types of restorative materials: a 3D finite element analysis

2021 ◽  
Vol 32 (11) ◽  
Author(s):  
Qingzhen Meng ◽  
Yuejiao Zhang ◽  
Danlu Chi ◽  
Qimei Gong ◽  
Zhongchun Tong
Keyword(s):  
Maximum Principal Stress ◽  
Height Loss ◽  
Pulp Chamber ◽  
Endodontically Treated Teeth ◽  
Element Analysis ◽  
External Edge ◽  
3D Finite Element ◽  
Crown Length ◽  
Cad Cam ◽  
Tooth Tissue

AbstractA thin endocrown restoration was often applied in endodontically treated teeth with vertical bite height loss or inadequate clinical crown length. A model of mandibular molars made by endocrown restoration with 1 mm thickness and 2 mm depth of pulp chamber was constructed and imported into FEA ANSYS v18.0 software. The three CAD/CAM materials, feldspathic (Mark2), lithium disilicate (EMAX), and lava ultimate (LU), were assigned, and the five load indenters were loaded on the full occlusal (FO), occlusal center (OC), central fossa (CF), buccal groove (BG), and mesiobuccal cusp (MC) of restoration in the model. The MinPS and MaxPS of the thin endocrown were significantly higher than those of tooth tissue in five types of loads except for the LU endocrown loaded in the FO group. The smaller the contact surface of the load was, the higher MaxPS and MinPS were. MaxPS and MinPS of the MC were the highest, followed by the BG and CF in the restoration. In the stress distribution of tooth tissue, MaxPS in the LU endocrown accumulated at the external edge of enamel and was significantly higher than MaxPS in Mark2 and EMAX endocrown concentrated on the chamber wall of dentin under OC, CF and BG loads. Within the limitations of this FEA study, the LU endocrown transferred more stress to tooth tissue than Mark2 and EMAX, and the maximum principal stress on endocrown restoration and tooth tissue at the mesiobuccal cusp load was higher than that at the central fossa and buccal groove load.

scholarly journals Resistance Fracture of Minimally Prepared Endocrowns Made By Three Types of Restorative Materials: A 3D Finite Element Analysis

2021 ◽  
Author(s):  
Qingzhen Meng ◽  
Yuejiao Zhang ◽  
Danlu Chi ◽  
Qimei Gong ◽  
Zhongchun Tong
Keyword(s):  
Maximum Principal Stress ◽  
Height Loss ◽  
Pulp Chamber ◽  
Endodontically Treated Teeth ◽  
Element Analysis ◽  
External Edge ◽  
3D Finite Element ◽  
Crown Length ◽  
Cad Cam ◽  
Tooth Tissue

Abstract A thin endocrown restoration was often applied in endodontically treated teeth with vertical bite height loss or inadequate clinical crown length. A model of mandibular molars made by endocrown restoration with 1 mm thickness and 2 mm depth of pulp chamber was constructed and imported into FEA ANSYS v18.0 software. The three CAD/CAM materials, feldspathic (Mark2), lithium disilicate (EMAX) and lava ultimate (LU), were assigned, and the five load indenters were loaded on the full occlusal (FO), occlusal center (OC), central fossa (CF), buccal groove (BG) and mesiobuccal cusp (MC) of restoration in the model. The MinPS and MaxPS of the thin endocrown were significantly higher than those of tooth tissue in five types of loads except for the LU endocrown loaded in the FO group. The smaller the contact surface of the load was, the higher MaxPS and MinPS were. MaxPS and MinPS of the MC were the highest, followed by the BG and CF in the restoration. In the stress distribution of tooth tissue, MaxPS in the LU endocrown accumulated at the external edge of enamel and was significantly higher than MaxPS in Mark2 and EMAX endocrown concentrated on the chamber wall of dentin under OC, CF and BG loads. Within the limitations of this FEA study, the LU endocrown transferred more stress to tooth tissue than Mark2 and EMAX, and the maximum principal stress on endocrown restoration and tooth tissue at the mesiobuccal cusp load was higher than that at the central fossa and buccal groove load.

scholarly journals Restoration of Endodontically Treated Molars Using All Ceramic Endocrowns

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Roopak Bose Carlos ◽  
Mohan Thomas Nainan ◽  
Shamina Pradhan ◽  
Roshni Sharma ◽  
Shiny Benjamin ◽  
...  
Keyword(s):  
Single Unit ◽  
Clinical Success ◽  
Case Reports ◽  
Butt Joint ◽  
Pulp Chamber ◽  
Endodontically Treated Teeth ◽  
Posterior Teeth ◽  
The Core ◽  
All Ceramic ◽  
Cad Cam

Clinical success of endodontically treated posterior teeth is determined by the postendodontic restoration. Several options have been proposed to restore endodontically treated teeth. Endocrowns represent a conservative and esthetic restorative alternative to full coverage crowns. The preparation consists of a circular equigingival butt-joint margin and central retention cavity into the entire pulp chamber constructing both the crown and the core as a single unit. The case reports discussed here are moderately damaged endodontically treated molars restored using all ceramic endocrowns fabricated using two different systems, namely, CAD/CAM and pressed ceramic.

scholarly journals Influence of Number of Implants and Attachment Type on Stress Distribution in Mandibular Implant-Retained Overdentures: Finite Element Analysis

2017 ◽  
Vol 5 (2) ◽  
pp. 244-249 ◽  
Author(s):  
Mohamed I. El-Anwar ◽  
Eman A. El-Taftazany ◽  
Hamdy A. Hamed ◽  
Mohamed A. Abd ElHay
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Finite Element Models ◽  
Oblique Angle ◽  
Element Analysis ◽  
3D Finite Element ◽  
Cad Cam ◽  
The Right ◽  
Molar Region

AIM: This study aimed to compare the stresses generated by using two or four root form dental implants supporting mandibular overdentures that were retained with ball and locator attachments.METHODS: Under ANSYS environment, four 3D finite element models were prepared. These models simulated complete overdentures supported by two or four implants with either ball or locator attachments as a connection mechanism. The models’ components were created by CAD/CAM package then were imported to ANSYS. Load of 100 N was applied at the right premolar/molar region vertically and at an oblique angle of 110° from lingual direction.RESULTS: Within the conditions of this research, in all cases, it was found that cortical and cancellous bone regions were the least to be stressed. Also, the ball attachment produced higher stresses.CONCLUSION: Caps deformation and stresses are negligible in cases of using locator attachment in comparison to ball attachments. This may indicate longer lifetime and less repair/maintenance operations in implant overdentures retained by locator attachments. Although the study revealed that bone was insensitive to a number of implants or attachment type, it may be recommended to use two implants in the canine region than using four, where the locator attachments were found to be better.

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 Effect of Biologically Oriented Preparation Technique on the Stress Concentration of Endodontically Treated Upper Central Incisor Restored with Zirconia Crown: 3D-FEA

Molecules ◽  
2021 ◽  
Vol 26 (20) ◽  
pp. 6113
Author(s):  
Luigi Giovanni Bernardo Sichi ◽  
Fernanda Zapater Pierre ◽  
Laura Viviana Calvache Arcila ◽  
Guilherme Schmitt de Andrade ◽  
João Paulo Mendes Tribst ◽  
...  
Keyword(s):  
Stress Concentration ◽  
Resin Composite ◽  
Maximum Principal Stress ◽  
Structural Testing ◽  
Preparation Technique ◽  
Dental Resin ◽  
Endodontically Treated Teeth ◽  
Element Analysis ◽  
Fixed Base ◽  
Zirconia Crowns

The aim of this study was to evaluate the effect of biologically oriented preparation technique on the stress concentration of endodontically treated upper central incisors restored with zirconia crown (yttria-stabilized zirconia polycrystalline ceramic) through finite element analysis (FEA). Four models of maxillary central incisors containing enamel, dentin, periodontal ligament, cortical and medullary bone were created in CAD. Each model received a polymeric core-build up with nanofilled dental resin composite. The evaluated models were SM—preparation in shoulder 90°; CM—chamfer preparation; BOPT—biologically oriented preparation technique and BOPTB—BOPT preparation 1 mm below the cement-enamel junction. All models received zirconia crowns (5Y-TZP), fiberglass post and 1 mm ferrule. The models were imported into the analysis software with parameters for mechanical structural testing using the maximum principal stress and the tensile strength as the analysis criteria. Then, load of 150 N was applied at the cingulum with 45° slope to the long axis of the tooth, with the fixed base for each model. The type of marginal preparation affected the stresses concentration in endodontically treated teeth and in the zirconia crown margin. Considering the stress magnitude only, BOPT is a viable option for anterior monolithic zirconia crowns; however, with the highest stress magnitude at the restoration margin.

3D Finite Element Analysis of Stationary Power Generation Diesel Engine Connecting Rod

2011 ◽  
Vol 332-334 ◽  
pp. 1992-1995 ◽  
Author(s):  
Bin Zheng ◽  
Yong Qi Liu ◽  
Rui Xiang Liu ◽  
Jian Meng
Keyword(s):  
Power Generation ◽  
Finite Element ◽  
Diesel Engine ◽  
Safety Factor ◽  
Maximum Principal Stress ◽  
Connecting Rod ◽  
Element Analysis ◽  
3D Finite Element ◽  
Maximum Deformation ◽  
3D Finite Element Method

In this paper, with the ANSYS, stress distribution and safety factor of stationary power generation diesel engine connecting rod were analyzed by using 3D finite element method. The results show that the position of maximum principal stress is transition location of small end and connecting rod shank at maximum compression condition. The value of stress is 176 MPa in dangerous position. Maximum deformation is 0.0713mm. Safety factor is 1.86. The oil-hole of small end is the exposed destructive positions at maximum stretch condition. Maximum stress value is 67.7 MPa in dangerous position. Maximum deformation is 0.0145mm.

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