The effects of design parameters on mechanical failure of Ti-6Al-4V implants using finite element analysis

Bayata, Fatma; Yıldız, Cengiz

doi:10.1016/j.engfailanal.2020.104445

Cited by 29 publications

(10 citation statements)

References 53 publications

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“…This increase in demand is linked to the inherent complexity of the required implants that, paired with the differences between patients, makes their standardization difficult, originating the challenge to manufacture high-quality and different implantable devices [1,2]. Most of the current research on the design optimization of customized implants is focused on finding the optimal configuration to achieve the best performances in vivo [3][4][5][6]. Specifically, bespoke implants are produced to fit the patient's anatomical districts of interest even considering complex implant sites [7,8].…”

Section: Introductionmentioning

confidence: 99%

Selective Laser Melting and Electron Beam Melting of Ti6Al4V for Orthopedic Applications: A Comparative Study on the Applied Building Direction

et al. 2020

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The 3D printing process offers several advantages to the medical industry by producing complex and bespoke devices that accurately reproduce customized patient geometries. Despite the recent developments that strongly enhanced the dominance of additive manufacturing (AM) techniques over conventional methods, processes need to be continually optimized and controlled to obtain implants that can fulfill all the requirements of the surgical procedure and the anatomical district of interest. The best outcomes of an implant derive from optimal compromise and balance between a good interaction with the surrounding tissue through cell attachment and reduced inflammatory response mainly caused by a weak interface with the native tissue or bacteria colonization of the implant surface. For these reasons, the chemical, morphological, and mechanical properties of a device need to be designed in order to assure the best performances considering the in vivo environment components. In particular, complex 3D geometries can be produced with high dimensional accuracy but inadequate surface properties due to the layer manufacturing process that always entails the use of post-processing techniques to improve the surface quality, increasing the lead times of the whole process despite the reduction of the supply chain. The goal of this work was to provide a comparison between Ti6Al4V samples fabricated by selective laser melting (SLM) and electron beam melting (EBM) with different building directions in relation to the building plate. The results highlighted the influence of the process technique on osteoblast attachment and mineralization compared with the building orientation that showed a limited effect in promoting a proper osseointegration over a long-term period.

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Section: Introductionmentioning

confidence: 99%

Selective Laser Melting and Electron Beam Melting of Ti6Al4V for Orthopedic Applications: A Comparative Study on the Applied Building Direction

et al. 2020

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“…This led to a notable reduction in the maximum equivalent stress value in Model B to 212.71 MPa, signifying a substantial enhancement in the implant's durability. In a finite element analysis of the mechanical failure of implants, it was reported that implant diameter and wall thickness are influential parameters in stress reduction [25]. In addition, changes in implant length and loading angle directly affect both the static strength and fatigue strength of the dental implant [26].…”

Section: Stress Analysismentioning

confidence: 99%

The Influence of Design on Stress Concentration Reduction in Dental Implant Systems Using the Finite Element Method

Pala,

Ozdemir,

Grund

et al. 2023

Crystals

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Dental implant fracture is closely connected to the stress buildup surrounding the implant system during static loading. In areas where the cross-section of the implant rapidly changes or where the geometry of the implant system has discontinuities, stress concentrations arise. Therefore, the implant’s design is crucial in preventing early failure of the implant system, including fracture, screw loosening, and increased leakage, in addition to reducing stresses at the implant–abutment interface. In the current work, three-dimensional (3D) models of mechanically connected Ti6-Al-4V implant systems in various dimensions were constructed. Finite element analysis (FEA) was used to conduct a stress study of the created implants under actual acting force static loading conditions in accordance with ISO 14801. In the created models, design elements including implant screw type, thickness, and taper angle of abutment were modified in order to increase the longevity of the implants. The results show that the equivalent stress level was dramatically reduced from 596.22 MPa to 212.72 MPa in the implant model, which exhibits a more homogeneous stress pattern under static loading conditions. By increasing the implant wall thickness from 0.15 mm to 0.40 mm in the region adjacent to the abutment, the stress levels, especially at the internal screw, were significantly reduced. Also, the design modification in Model B, establishing contact between the abutment and the upper part of the conical surface of the implant, resulted in a decrease in stress in the internal screw. Thus, enhanced homogeneity in stress distribution not only improves the harmony between the implant and surrounding tissues, thus increasing patient comfort and reducing the risk of complications, but also holds promise for the development of new implants capable of withstanding the forces encountered in the oral environment due to the relatively smoother stress transmission observed in this model.

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“…With the emergence of 3D printing technology, precision medicine can now be practiced ( Lee et al, 2005 ). 3D printing can directly generate complex 3D layered structures from computational models ( Bayata and Yildiz, 2020 ), which provides a new way to prepare porous implants ( Van Bael et al, 2012 ; Taniguchi et al, 2016 ; Prasad et al, 2017 ; Zhang B. et al, 2018 ). The effective contact area controls how the implant material interacts with neighboring tissues when the implant surface directly contacts bone tissue.…”

Section: Interface Response Between Bone and Implant Materials Follow...mentioning

confidence: 99%

Porous construction and surface modification of titanium-based materials for osteogenesis: A review

Wang

et al. 2022

Front. Bioeng. Biotechnol.

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Titanium and titanium alloy implants are essential for bone tissue regeneration engineering. The current trend is toward the manufacture of implants from materials that mimic the structure, composition and elasticity of bones. Titanium and titanium alloy implants, the most common materials for implants, can be used as a bone conduction material but cannot promote osteogenesis. In clinical practice, there is a high demand for implant surfaces that stimulate bone formation and accelerate bone binding, thus shortening the implantation-to-loading time and enhancing implantation success. To avoid stress shielding, the elastic modulus of porous titanium and titanium alloy implants must match that of bone. Micro-arc oxidation technology has been utilized to increase the surface activity and build a somewhat hard coating on porous titanium and titanium alloy implants. More recently, a growing number of researchers have combined micro-arc oxidation with hydrothermal, ultrasonic, and laser treatments, coatings that inhibit bacterial growth, and acid etching with sand blasting methods to improve bonding to bone. This paper summarizes the reaction at the interface between bone and implant material, the porous design principle of scaffold material, MAO technology and the combination of MAO with other technologies in the field of porous titanium and titanium alloys to encourage their application in the development of medical implants.

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The effects of design parameters on mechanical failure of Ti-6Al-4V implants using finite element analysis

Cited by 29 publications

References 53 publications

Selective Laser Melting and Electron Beam Melting of Ti6Al4V for Orthopedic Applications: A Comparative Study on the Applied Building Direction

Selective Laser Melting and Electron Beam Melting of Ti6Al4V for Orthopedic Applications: A Comparative Study on the Applied Building Direction

The Influence of Design on Stress Concentration Reduction in Dental Implant Systems Using the Finite Element Method

Porous construction and surface modification of titanium-based materials for osteogenesis: A review

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