scholarly journals Evaluation of stress distributions in peri-implant and periodontal bone tissues in 3- and 5-unit tooth and implant-supported fixed zirconia restorations by finite elements analysis

2015 ◽  
Vol 09 (03) ◽  
pp. 329-339 ◽  
Author(s):  
Sedat Guven ◽  
Koksal Beydemir ◽  
Serkan Dundar ◽  
Veysel Eratilla
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Stress Distributions ◽  
Finite Elements Analysis ◽  
Element Analysis ◽  
3D Finite Element ◽  
Cervical Portion ◽  
Distribution Of Stress ◽  
Stress Accumulation

ABSTRACT Objective: In this study, it is aimed to compare the distribution of stress on periodontal and peri-implant bone tissues in 3- and 5-unit-dental and implant-supported zirconia restorations using finite element analysis. Materials and Methods: Stress distribution formed in periodontal and peri-implant bone tissues as a result of chewing forces was analyzed in dental and implant-supported three-dimensional (3D) finite element models of zirconia restoration with 5-unit placed on the numbers of 43, 44, 45, 46, and 47 and with 3-unit placed on the number of 45, 46, and 47. Four different loading conditions were used. 200 N force was applied in 30° from the buccal inclination of number 43, 45, and 47 restorations separately and totally 850 N force was applied in 30° from the buccal inclination of whole restoration. The study was performed through static nonlinear analysis with the 3D finite element analysis method. Results: Stress accumulation in bone tissues in the tooth-supported model was found less than in implant-supported models. Stress accumulation was observed in the cervical portion of the implant in implant-supported models, and stress accumulation was observed surrounding bone of roots in tooth-supported models. The highest stress values were occurred in 5 unit implant-supported model in all loadings. Conclusion: In posterior restorations increased in the number of supported teeth and implant can reduce the destructive forces on periodontal and peri-implant bone tissues and may allow longer period retention of the restorations in the mouth.

scholarly journals Comparison of Tooth- and Bone-Borne Appliances on the Stress Distributions and Displacement Patterns in the Facial Skeleton in Surgically Assisted Rapid Maxillary Expansion—A Finite Element Analysis (FEA) Study

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1152
Author(s):  
Rafał Nowak ◽  
Anna Olejnik ◽  
Hanna Gerber ◽  
Roman Frątczak ◽  
Ewa Zawiślak
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Rapid Maxillary Expansion ◽  
Stress Distributions ◽  
Maxillary Expansion ◽  
Facial Skeleton ◽  
Element Analysis ◽  
Maxillary Constriction

The aim of this study was to compare the reduced stresses according to Huber’s hypothesis and the displacement pattern in the region of the facial skeleton using a tooth- or bone-borne appliance in surgically assisted rapid maxillary expansion (SARME). In the current literature, the lack of updated reports about biomechanical effects in bone-borne appliances used in SARME is noticeable. Finite element analysis (FEA) was used for this study. Six facial skeleton models were created, five with various variants of osteotomy and one without osteotomy. Two different appliances for maxillary expansion were used for each model. The three-dimensional (3D) model of the facial skeleton was created on the basis of spiral computed tomography (CT) scans of a 32-year-old patient with maxillary constriction. The finite element model was built using ANSYS 15.0 software, in which the computations were carried out. Stress distributions and displacement values along the 3D axes were found for each osteotomy variant with the expansion of the tooth- and the bone-borne devices at a level of 0.5 mm. The investigation showed that in the case of a full osteotomy of the maxilla, as described by Bell and Epker in 1976, the method of fixing the appliance for maxillary expansion had no impact on the distribution of the reduced stresses according to Huber’s hypothesis in the facial skeleton. In the case of the bone-borne appliance, the load on the teeth, which may lead to periodontal and orthodontic complications, was eliminated. In the case of a full osteotomy of the maxilla, displacements in the buccolingual direction for all the variables of the bone-borne appliance were slightly bigger than for the tooth-borne appliance.

scholarly journals Displacement and stress distribution of the craniomaxillofacial complex under different surgical conditions: a three-dimensional finite element analysis of fracture mechanics

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Junjie Chen ◽  
Yuhan Xu ◽  
Chengri Li ◽  
Lingling Zhang ◽  
Fang Yi ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Three Dimensional ◽  
Lateral Wall ◽  
Lateral Extension ◽  
Element Analysis ◽  
Lateral Osteotomy ◽  
Model C ◽  
Stress Accumulation

Abstract Objective To provide a simplified treatment strategy for patients with maxillary transverse deficiency. We investigated and compared the fracture mechanics and stress distribution of a midline palatal suture under dynamic loads during surgically-assisted rapid palatal expansion. Methods Based on the cone-beam computed tomography (CBCT) data of a 21-year-old female volunteer, a three-dimensional model of the cranio-maxillofacial complex (including the palatal suture) was constructed. A finite element analysis model was constructed based on meshwork. After the yield strength of the palatal suture was set, an increasing expansion force (0–500 N) was applied within 140 ms to calculate the time–load curve, which mimicked nonsurgical bone expansion (model A). The same method was used to evaluate the fracture process, time and stress distribution of the palatal suture in maxillary lateral osteotomy-assisted (model B) and LeFort osteomy I (LFIO)-assisted expansion of the maxillary arch (model C). Results Compared with model A, the palatal suture of model B and model C showed a faster stress accumulation rate and shorter fracture time, and the fracture time of model B and model C was almost identical. Compared with model A, we discovered that model B and model C showed greater lateral extension of the maxilla, and the difference was reflected mainly in the lower part of the maxilla, and there was no difference between model B and model C in lateral extension of the maxilla. Conclusions Compared with arch expansion using nonsurgical assistance (model A), arch expansion using maxillary lateral wall-osteotomy (model B) or LFIO had a faster rate of stress accumulation, shorter time of fracture of the palatal suture and increased lateral displacement of the maxilla. Compared with arch expansion using LFIO (model C), arch expansion using lateral osteotomy (model B) had a similar duration of palatal suture rupture and lateral maxillary extension. In view of the trauma and serious complications associated with LFIO, maxillary lateral wall-osteotomy could be considered a substitute for LFIO.

An Investigation of Three Dimensional Elastic-Plastic Hemispherical Sliding Contact, Part II: Results

2007 ◽  
Author(s):  
John Moody ◽  
Itzhak Green
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Sliding Contact ◽  
Net Energy ◽  
Asperity Contact ◽  
Element Analysis ◽  
3D Finite Element ◽  
Elastic Plastic ◽  
Contact Part

This work presents the results from a three dimensional (3D) finite element analysis (FEA) of an elastic-plastic asperity contact model for two spherical bodies sliding across each other with various preset vertical interferences. Stresses, forces, contact areas, deformations, and net energy loss are presented for steel-on-steel and aluminum-on-copper contact.

scholarly journals Effect of Offset Implant Placement on the Stress Distribution Around a Dental Implant: A Three-Dimensional Finite Element Analysis

2015 ◽  
Vol 41 (6) ◽  
pp. 646-651 ◽  
Author(s):  
Hakimeh Siadat ◽  
Shervin Hashemzadeh ◽  
Allahyar Geramy ◽  
Seyed Hossein Bassir ◽  
Marzieh Alikhasi
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Concentration ◽  
Stress Distribution ◽  
Dental Implant ◽  
Three Dimensional ◽  
Element Analysis ◽  
3D Finite Element ◽  
Implant Placement ◽  
Mandibular Molar

There are some anatomical restrictions in which implants are not possible to be inserted in their conventional configuration. Offset placement of implants in relation to the prosthetic unit could be a treatment solution. The aim of this study was to evaluate the effect of the offset placement of implant-supported prosthesis on the stress distribution around a dental implant using 3D finite element analysis. 3D finite element models of implant placement in the position of a mandibular molar with 4 configurations (0, 0.5, 1, 1.5 mm offset) were created in order to investigate resultant stress/strain distribution. A vertical load of 100 N was applied on the center of the crown of the models. The least stress in peri-implant tissue was found in in-line configuration (0 mm offset). Stress concentration in the peri-implant tissue increased by increasing the amount of offset placement. Maximum stress concentration in all models was detected at the neck of the implant. It can be concluded that the offset placement of a single dental implant does not offer biomechanical advantages regarding reducing stress concentration over the in-line implant configuration. It is suggested that the amount of offset should be as minimum as possible.

scholarly journals Displacement and Stress Distribution of the Craniomaxillofacial Complex Under Different Surgical Conditions: A Three-Dimensional Finite Element Analysis of Fracture Mechanics

2021 ◽  
Author(s):  
Junjie Chen ◽  
Yuhan Xu ◽  
Chengri Li ◽  
Lingling Zhang ◽  
Fang Yi ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Three Dimensional ◽  
Lateral Wall ◽  
Lateral Extension ◽  
Element Analysis ◽  
Lateral Osteotomy ◽  
Model C ◽  
Stress Accumulation

Abstract Objective: To provide a simplified treatment strategy for patients with maxillary transverse deficiency. We investigated and compared the fracture mechanics and stress distribution of a midline palatal suture under dynamic loads during surgically-assisted rapid palatal expansion. Methods: Based on the cone-beam computed tomography (CBCT) data of a 21-year-old female volunteer, a three-dimensional model of the cranio-maxillofacial complex (including the palatal suture) was constructed. A finite element analysis model was constructed based on meshwork. After the yield strength of the palatal suture was set, an increasing expansion force (0–500 N) was applied within 140 ms to calculate the time–load curve, which mimicked nonsurgical bone expansion (model A). The same method was used to evaluate the fracture process, time and stress distribution of the palatal suture in maxillary lateral osteotomy-assisted (model B) and LeFort osteomy I (LFIO)-assisted expansion of the maxillary arch (model C). Results: Compared with model A, the palatal suture of model B and model C showed a faster stress accumulation rate and shorter fracture time, and the fracture time of model B and model C was almost identical. Compared with model A, we discovered that model B and model C showed greater lateral extension of the maxilla, and the difference was reflected mainly in the lower part of the maxilla, and there was no difference between model B and model C in lateral extension of the maxilla. Conclusions: Compared with arch expansion using nonsurgical assistance (model A), arch expansion using maxillary lateral wall-osteotomy (model B) or LFIO had a faster rate of stress accumulation, shorter time of fracture of the palatal suture and increased lateral displacement of the maxilla. Compared with arch expansion using LFIO (model C), arch expansion using lateral osteotomy (model B) had a similar duration of palatal suture rupture and lateral maxillary extension. In view of the trauma and serious complications associated with LFIO, maxillary lateral wall-osteotomy could be considered a substitute for LFIO.

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.

Three Dimensional Structural Analysis of Complex Sluice Chamber Structures

2012 ◽  
Vol 170-173 ◽  
pp. 1971-1976
Author(s):  
Hong Yun Si ◽  
Min Chen
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Element Analysis ◽  
3D Finite Element ◽  
Massive Structure ◽  
Floor Structure ◽  
The Finite Element Model ◽  
Better Than

This paper mainly introduces how to use the software of Marc to calculate the displacement and stress of the sluice. The finite element model which concludes the sluice, piles and foundation was structured for calculation and analysis using the contact analysis function provided by the program. the displacement and stress of the massive structure was worked out to estimate its whole stability and evaluate workability state of the sluice under different structures. The example shows that the results of 3D finite element analysis can be used to accurately reflect the state of the buildings overall strength and displacement. The integral floor structure of contrary arch floor sluice is better than the separated floor structure to adapt to the foundation uneven settlement, but the separated floor structure of contrary arch floor sluice makes stress form more reasonable.

scholarly journals Evaluation of stress distribution in bone and three-unit fixed implant-supported prostheses with zirconia and titanium abutments: A 3D finite element analysis

2018 ◽  
Vol 12 (4) ◽  
pp. 258-263
Author(s):  
Fahimeh Hamedirad ◽  
Tahereh Ghaffari ◽  
Navideh Mehanfar
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
High Strength ◽  
Element Analysis ◽  
3D Finite Element ◽  
3D Finite Element Analysis ◽  
Lateral Forces ◽  
Distribution Of Stress ◽  
Surrounding Bone

Background. For esthetic considerations in anterior regions, abutments with high-strength ceramics such as alumina and zirconia have been developed as substitutes for titanium abutments. The present study was designed to investigate the distribution of stress in prosthesis and bone components of an implant-supported FPD with different abutments by using 3D finite element analysis. Methods. Ceramic FPDs were made from the canine to the upper left second premolar with titanium fixtures. In order to investigate the stress distribution, forces of 100 and 300 N were applied at angles of 0, 15 and 35 degrees to the central fossa of the second premolar and pontic, as well as the cingulum of the canine crown. Force loading was static. After analyzing the mechanical properties of the materials, boundary conditions and loading were performed according to the existing averages, and subsequently, the results obtained from this analysis were analyzed. Results. The highest level of stress was observed in the distal crest of the posterior implant (23.20 MPa) under lateral forces (15 and 35 degrees) in a model with both titanium abutments. Conclusion. Lateral forces induced higher accumulation of stress in the implant and surrounding bone, while abutment change did not affect the distribution of stress.

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