Biomechanical Study on the Influence of Shaping Amplitude on Material Strenght of Titanium Implant

2013 ◽  
Vol 275-277 ◽  
pp. 23-27 ◽  
Author(s):  
Ya Lan Li ◽  
Wei Peng Guo ◽  
Wen Tao Jiang ◽  
Qing Yuan Wang ◽  
Yu Bo Fan
Keyword(s):  
Titanium Implant ◽  
Biomechanical Study ◽  
Titanium Implants ◽  
Uniaxial Tensile ◽  
Material Strength ◽  
Element Analysis ◽  
Three Point Bending ◽  
Uniaxial Tensile Testing ◽  
Residual Material ◽  
Different Levels

The effect of shaping amplitude on the residual material strength of titanium implants was studied. A purposely built to and fro three point bending apparatus was developed for different amplitudes on the implant material. The strength of the material after different levels of amplitude was investigated thorough uniaxial tensile testing. The effect of stress concentration due to amplitude was investigated by finite element analysis. It was concluded that plastic deformation due to shaping amplitude produced different effect on the residual strength of the material.

Comparison of modified Kessler tendon suture at different levels in the human flexor digitorum profundus tendon and porcine flexors and porcine extensors: an experimental biomechanical study

2011 ◽  
Vol 36 (8) ◽  
pp. 670-676 ◽  
Author(s):  
J. Havulinna ◽  
O. V. Leppänen ◽  
T. L. N. Järvinen ◽  
H. Göransson
Keyword(s):  
Tensile Testing ◽  
Flexor Tendon ◽  
Biomechanical Study ◽  
Flexor Digitorum Profundus ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Testing ◽  
Polyester Suture ◽  
Flexor Digitorum ◽  
Flexor Digitorum Profundus Tendon ◽  
Different Levels

This study compared the biomechanical behaviour of repairs in the human flexor digitorum profundus tendon in zones I, II and III with repairs of different segments of the porcine flexor tendon of the second digit and the extensor digiti quarti proprius tendon, in order to assess the validity of porcine tendons as models for human flexor tendon repairs. These porcine tendons were selected after comparing their size with the human flexor digitorum profundus tendon. The tendon repairs were done in three segments of each porcine tendon and repairs in the human tendons were done in zones I,II and III. Ten tendons in each group yielded a total of 90 specimens. A modified Kessler repair was done with 3-0 coated braided polyester suture and subjected to uniaxial tensile testing. In human flexor tendons, the ultimate force was higher in zones I and II than in zone III. The porcine flexor digitorum profundus tendon from the second digit and the proximal segment of the extensor digiti quarti proprius tendon behaved similarly to the human flexor tendon in zone III and can be considered as surrogates for the human flexor tendon.

scholarly journals Comparative Evaluation of Biomechanical Performance of Titanium and Stainless Steel Mini Implants at Different Angulations in Maxilla: A Finite Element Analysis

2019 ◽  
Vol 53 (3) ◽  
pp. 197-205
Author(s):  
Kshitij Hemant Sabley ◽  
Usha Shenoy ◽  
Sujoy Banerjee ◽  
Pankaj Akhare ◽  
Ananya Hazarey ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Computer Aided Design ◽  
Three Dimensional ◽  
Titanium Implant ◽  
Titanium Implants ◽  
Element Analysis ◽  
Mini Implants ◽  
The Difference ◽  
Tractional Forces ◽  
Three Dimensional Models

Objective: To assess and compare the tensions and deformations (stresses and strains) generated after application of two types of forces (traction and torsion) in miniscrews of two different materials (titanium and stainless steel) placed at five different angulations. Materials and Methods: Three-dimensional models of the posterior maxillary area and the mini-implants were constructed using computer-aided design software program (CATIA P3 V5-6 R2015 B26 / 2016; Dassault Systèmes). Titanium and stainless steel materials were used for miniscrews. The area constructed was in between the maxillary second premolar and first molar. The models with mini-implants were inserted at five different angulations (30°, 45°, 60°, 75° and 90°). Torsional and tractional forces were applied on these implants, and the models were solved using ANSYS 10.0. Stress generated in implant and in the cortical and cancellous bones was evaluated and compared at all the five angulations. Results: Stress generated in stainless steel mini-implant during torsional and linear force application was less when compared with titanium mini-implant. Also, stress generated in implants of both materials increased as the angle increased from 30° to 90°. Difference in stress generated by stainless steel implant in the cortical bone for both linear and torsional forces was less when compared with titanium implant, whereas for cancellous bone, the difference was insignificant at all the angles. Conclusion: Irrespective of angles, difference in stress generated in stainless steel implants and titanium implants for both the forces was not significant, and hence, stainless steel implants can be used effectively in a clinical setting.

Finite Element Analysis of Multi-Implant Surgery for a Large Area of Defects

2014 ◽  
Vol 563 ◽  
pp. 396-402
Author(s):  
Ming June Tsai ◽  
Ching Tsai Wu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Cortical Bone ◽  
Maximum Stress ◽  
Alveolar Bone ◽  
Titanium Implant ◽  
Titanium Implants ◽  
Large Area ◽  
Element Analysis ◽  
Titanium Screw

This study aimed to confirm the application of multi-implants for mandibles with a large edentulous area using methods of finite element analysis (FEA). 3D finite element models of mandible with multi-implants were generated form reverse engineering of CT images stored in DICOM format. In the FEA of the implant model, the majority of the stress falls onto neck of the titanium implant and is well-distributed around the cylinder body of screw, resulting in less stress being applied to the cortical bone around titanium screw. Under a continual normal force of 100 N, The maximum stress on the cortical bone was located in the area around the titanium implants, and was 111.62Mpa, while the maximum stress on the titanium implant was located at the neck of the implant, and was 120.35 Mpa, much lower than the yield strength of the titanium framework (1260Mpa). The maximum deformation was around 0.65 mm. The deformation of the alveolar bone in our multi-implant model was within the acceptable range. This study show that the titanium screw used for multi-implants meets the requirements in term of physical properties for a large area of defects.

Surface and Biomechanical Study of Titanium Implants Modified by Laser With and Without Hydroxyapatite Coating, in Rabbits

2012 ◽  
Vol 38 (3) ◽  
pp. 231-237 ◽  
Author(s):  
Karin E. Sisti ◽  
Rafael de Rossi ◽  
Andreia M. Brochado Antoniolli ◽  
Ricardo D. Aydos ◽  
Antonio C. Guastaldi ◽  
...  
Keyword(s):  
Titanium Implant ◽  
Biomechanical Study ◽  
Titanium Implants ◽  
Biomechanical Analysis ◽  
Hydroxyapatite Coating ◽  
Control Group ◽  
Machined Surface ◽  
Group Iii ◽  
Group I ◽  
Control Group Group

Surface and biomechanical analysis of titanium implant surfaces modified by laser beam with and without hydroxyapatite. Titanium implants with 3 different surfaces were inserted into the tibias of 30 rabbits: group I (GI) machined surface (control group), group II irradiated with laser (GII), and group III irradiated with laser and hydroxyapatite coating applied—biomimetic method (GIII). Topographical analysis with scanning electron microscopy was made before surgery in the tibia. These rabbits were distributed into 2 periods of observation: 4 and 8 weeks postsurgery, after which biomechanical analysis (removal torque) was conducted. Statistical analysis used the Student-Newman-Keuls method. Surface showed roughness in GII and GIII. Biomechanical analysis demonstrated values with significant differences in GII and GIII. Titanium implants modified by laser irradiation can increase osseointegration during the initial phase.

Determination of Creep Damage Properties from a Miniature Three Point Bending Specimen Using an Inverse Approach

2017 ◽  
Vol 734 ◽  
pp. 260-272 ◽  
Author(s):  
J. Lu ◽  
A. Campbell-Brown ◽  
Shan Tung Tu ◽  
Wei Sun
Keyword(s):  
Power Plant ◽  
Creep Test ◽  
Test Specimen ◽  
Damage Model ◽  
Creep Damage ◽  
Material Strength ◽  
Element Analysis ◽  
Three Point Bending ◽  
Inverse Approach ◽  
Full Life

In this work, a novel method for determining the creep damage properties which can be used to represent the full life until failure from a miniature bending creep test specimen is developed based on a mathematical analysis and an inverse approach. Using the Kachanov-Rabotnov creep damage model, a mathematical expression for the deflection of a simply supported, rectangular miniature thin beam creep test specimen, under three-point bending (TPB), is derived. The outputs of these equations are iterated numerically using a MATLAB program. The time-dependent deflection curves are computed as the virtue TPB tests at various loads. The accuracy of the mathematical solutions is evaluated by the corresponding results obtained from finite element analysis. On this basis, an inverse method is then developed to obtain the creep and damage constants using a MATLAB optimisation scheme, where the primary creep is neglected. The results obtained for a power plant Grade 91 Cr steel is used for demonstration. The inverse approach developed has potential applications for assessing the high temperature material strength as part of a NDT procedure and for deriving the full life creep damage constitutive properties from a small volume of material, in particular, for various microstructure regions within a heat-affected zone of weldments, e.g. of power plant pipelines and aero-engine components.

Influence of post-welding tempering on mechanical behavior of friction welded joints from medium-carbon steels during tensile test

2020 ◽  
pp. 40-49
Author(s):  
A. S. Atamashkin ◽  
E. Yu. Priymak ◽  
N. V. Firsova
Keyword(s):  
Mechanical Behavior ◽  
Welded Joints ◽  
Welded Joint ◽  
Crack Nucleation ◽  
Carbon Steels ◽  
Uniaxial Tensile ◽  
Medium Carbon ◽  
Uniaxial Tensile Testing ◽  
Rotary Friction Welding ◽  
Medium Carbon Steels

The paper presents an analysis of the mechanical behavior of friction samples of welded joints from steels 30G2 (36 Mn 5) and 40 KhN (40Ni Cr 6), made by rotary friction welding (RFW). The influence of various temperature conditions of postweld tempering on the mechanical properties and deformation behavior during uniaxial tensile testing is analyzed. Vulnerabilities where crack nucleation and propagation occurred in specimens with a welded joint were identified. It was found that with this combination of steels, postweld tempering of the welded joint contributes to a decrease in the integral strength characteristics under conditions of static tension along with a significant decrease in the relative longitudinal deformation of the tested samples.

scholarly journals Comparison of the different voxel sizes in the estimation of peri-implant fenestration defects using cone beam computed tomography: an ex vivo study

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Mehmet Hakan Kurt ◽  
Nilsun Bağış ◽  
Cengiz Evli ◽  
Cemal Atakan ◽  
Kaan Orhan
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Ex Vivo ◽  
Statistical Significance ◽  
Area Under The Curve ◽  
Titanium Implant ◽  
Bone Defects ◽  
Titanium Implants ◽  
Cone Beam ◽  
Voxel Size

Abstract Background To examine the influence of voxel sizes to detect of peri-implant fenestration defects on cone beam computed tomography (CBCT) images. Materials and methods This study performed with three sheep heads both maxilla and mandible and two types of dental implant type 1 zirconium implant (Zr40) (n = 6) and type 2 titanium implant (Ti22) (n = 10). A total of 14 peri-implant fenestrations (8 buccal surfaces, 6 palatal/lingual surface) were created while 18 surfaces (8 buccal, 10 palatal/lingual) were free of fenestrations. Three observers have evaluated the images of fenestration at each site. Images obtained with 0.75 mm3, 0.100 mm3, 0.150 mm3, 0.200 mm3, and 0.400 mm3 voxel sizes. For intra- and inter-observer agreements for each voxel size, Kappa coefficients were calculated. Results Intra- and inter-observer kappa values were the highest for 0.150 mm3, and the lowest in 0.75 mm3 and 0.400 mm3 voxel sizes for all types of implants. The highest area under the curve (AUC) values were found higher for the scan mode of 0.150 mm3, whereas lower AUC values were found for the voxel size for 0.400 mm3. Titanium implants had higher AUC values than zirconium with the statistical significance for all voxel sizes (p ≤ 0.05). Conclusion A voxel size of 0.150 mm3 can be used to detect peri-implant fenestration bone defects. CBCT is the most reliable diagnostic tool for peri-implant fenestration bone defects.

scholarly journals Hydrogen-Assisted Fracture of Type 316L Tubing and Orbital Welds

2013 ◽  
Author(s):  
C. San Marchi ◽  
L. A. Hughes ◽  
B. P. Somerday ◽  
X. Tang
Keyword(s):  
Stainless Steels ◽  
Base Material ◽  
Austenitic Stainless Steels ◽  
Gaseous Hydrogen ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Testing ◽  
Type 316L ◽  
316L Austenitic Stainless Steel ◽  
Outside Diameter ◽  
Assisted Fracture

Austenitic stainless steels have been extensively tested in hydrogen environments. These studies have identified the relative effects of numerous materials and environmental variables on hydrogen-assisted fracture. While there is concern that welds are more sensitive to environmental effects than the non-welded base material, in general, there have been relatively few studies of the effects of gaseous hydrogen on the fracture and fatigue resistance of welded microstructures. The majority of published studies have considered welds with geometries significantly different from the welds produced in assembling pressure manifolds. In this study, conventional, uniaxial tensile testing was used to characterize tubing of type 316L austenitic stainless steel with an outside diameter of 6.35 mm. Additionally, orbital tube welds were produced and tested to compare to the non-welded tubing. The effects of internal hydrogen were studied after saturating the tubes and orbital welds with hydrogen by exposure to high-pressure gaseous hydrogen at elevated temperature. The effects of hydrogen on the ductility of the tubing and the orbital tube welds were found to be similar to the effects observed in previous studies of type 316L austenitic stainless steels.

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