Fatigue properties of UFG Ti grade 2 dental implant vs. conventionally tested smooth specimens

Fintová, Stanislava; Dlhý, Pavol; Mertová, Kateřina; Chlup, Zdeněk; Duchek, Michal; Procházka, Radek; Hutař, Pavel

doi:10.1016/j.jmbbm.2021.104715

Cited by 13 publications

(14 citation statements)

References 31 publications

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“…The FEM-based modeling proved to be a powerful tool for design and engineering of various medical articles—from dental implants to hip joints [ 31 , 32 ]. The fatigue life predictions using FEM for the Ti implants were proven to show good consistence with the experimental validation results [ 20 , 21 , 33 , 34 ]. The formalism used in the present work is based on reliable numerical procedures for the static and cyclic loading conditions accounting for the improved mechanical parameters of the considered material.…”

Section: Discussionmentioning

confidence: 89%

“…Finite element method (FEM) is proved to be a powerful technique for development of implants with optimized design, considering the variation of implant dimensions and connections [ 16 ], addressing various problems of oral and maxillofacial biomechanics [ 17 ], capturing the effect of thread shape and inclination [ 18 ], etc. Encouraging results have been recently achieved in experimentally justified FEM-driven study to develop narrow [ 19 ] and extra-narrow dental implants [ 20 ] and in numerical examination of the effect of ultrafine-grained structures on the fatigue limit for dental implants [ 21 ]. However, the efforts to account for the enhanced mechanical performance of nanostructured materials to miniaturize the implant dimensions have been rarely reported in the literature.…”

Section: Introductionmentioning

confidence: 99%

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Finite Element Modeling for Virtual Design to Miniaturize Medical Implants Manufactured of Nanostructured Titanium with Enhanced Mechanical Performance

Kazarinov

Stotskiy²,

Polyakov³

et al. 2022

Materials

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The study is aimed to virtually miniaturize medical implants produced of the biocompatible Ti with improved mechanical performance. The results on the simulation-driven design of medical implants fabricated of nanostructured commercially pure Ti with significantly enhanced mechanical properties are presented. The microstructure of initially coarse-grained Ti has been refined to ultrafine grain size by severe plastic deformation. The ultrafine-grained (UFG) Ti exhibits remarkably high static and cyclic strength, allowing to design new dental and surgical implants with miniaturized geometry. The possibilities to reduce the implant dimensions via virtual fatigue tests for the digital twins of two particular medical devices (a dental implant and a maxillofacial surgery plate) are explored with the help of finite element modeling. Additionally, the effect of variation in loading direction and the fixation methods for the tested implants are studied in order to investigate the sensitivity of the fatigue test results to the testing conditions. It is shown that the UFG materials are promising for the design of a new generation of medical products.

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Section: Discussionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Finite Element Modeling for Virtual Design to Miniaturize Medical Implants Manufactured of Nanostructured Titanium with Enhanced Mechanical Performance

Kazarinov

Stotskiy²,

Polyakov³

et al. 2022

Materials

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show abstract

“…We simulated the reconstruction of a segmental defect in the mandible and found a comparable increase in the reconstruction plate’s maximum occurring stress. Depending on the applied alloy and the actual maximum occurring stress value in the plate, this 25% stress increase could mean a decrease in a plate’s life span of 10,000 to several million cycles [ 46 ], which would mean less than a week to several years of intensive loading [ 47 ].…”

Section: Discussionmentioning

confidence: 99%

A Contemporary Approach to Non-Invasive 3D Determination of Individual Masticatory Muscle Forces: A Proof of Concept

Merema

Sieswerda

Spijkervet

et al. 2022

JPM

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Over the past decade, the demand for three-dimensional (3D) patient-specific (PS) modelling and simulations has increased considerably; they are now widely available and generally accepted as part of patient care. However, the patient specificity of current PS designs is often limited to this patient-matched fit and lacks individual mechanical aspects, or parameters, that conform to the specific patient’s needs in terms of biomechanical acceptance. Most biomechanical models of the mandible, e.g., finite element analyses (FEA), often used to design reconstructive implants or total joint replacement devices for the temporomandibular joint (TMJ), make use of a literature-based (mean) simplified muscular model of the masticatory muscles. A muscle’s cross-section seems proportionally related to its maximum contractile force and can be multiplied by an intrinsic strength constant, which previously has been calculated to be a constant of 37 [N/cm2]. Here, we propose a contemporary method to determine the patient-specific intrinsic strength value of the elevator mouth-closing muscles. The hypothesis is that patient-specific individual mandible elevator muscle forces can be approximated in a non-invasive manner. MRI muscle delineation was combined with bite force measurements and 3D-FEA to determine PS intrinsic strength values. The subject-specific intrinsic strength values were 40.6 [N/cm2] and 25.6 [N/cm2] for the 29- and 56-year-old subjects, respectively. Despite using a small cohort in this proof of concept study, we show that there is great variation between our subjects’ individual muscular intrinsic strength. This variation, together with the difference between our individual results and those presented in the literature, emphasises the value of our patient-specific muscle modelling and intrinsic strength determination protocol to ensure accurate biomechanical analyses and simulations. Furthermore, it suggests that average muscular models may only be sufficiently accurate for biomechanical analyses at a macro-scale level. A future larger cohort study will put the patient-specific intrinsic strength values in perspective.

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“…At the same time, the application of UFG Ti for the manufacture of medical implants is also associated with the surface modification of products, since they operate in a physiological environment that may have a negative effect on the surface. In particular, it was shown in [94], that the significant grain refinement achieved in Gr2 Ti by means of SPD Conform processing raised the UTS by almost two-fold, while the endurance limit increased from 375 MPa to 800 MPa. The surface treatment of implants by sandblasting in combination with acid etching (SLA) reduced the endurance limit of the UFG condition by almost 56%, and by нa 27% in the case of the CG structure; i.e., the SLA treatment had a larger impairing effect on the fatigue properties of UFG Ti, apparently due to a decreased ductility.…”

Section: On the Prospects Of The Practical Application Of Ti-based Ma...mentioning

confidence: 99%

Fatigue Properties of Ti Alloys with an Ultrafine Grained Structure: Challenges and Achievements

Semenova

Modina

Stotskiy

et al. 2022

Metals

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Ultrafine-grained (UFG) structure formation in Ti alloys, by severe plastic deformation (SPD) processing and enhancement of their mechanical properties, including fatigue properties, has been demonstrated in numerous studies in the past 20 years. The present overview analyzes the fatigue properties achieved to date in Ti alloys subjected to SPD. Such aspects are examined as the effect of a UFG structure on the fatigue behavior of commercially pure (CP) Ti, two-phase Ti alloys, using the popular Ti-6Al-4V alloy as an example, as well as on the kinetics and mechanisms of fatigue failure. The prospects and problems of the practical application of UFG Ti materials in medicine and aircraft engine construction are discussed.

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Fatigue properties of UFG Ti grade 2 dental implant vs. conventionally tested smooth specimens

Cited by 13 publications

References 31 publications

Finite Element Modeling for Virtual Design to Miniaturize Medical Implants Manufactured of Nanostructured Titanium with Enhanced Mechanical Performance

Finite Element Modeling for Virtual Design to Miniaturize Medical Implants Manufactured of Nanostructured Titanium with Enhanced Mechanical Performance

A Contemporary Approach to Non-Invasive 3D Determination of Individual Masticatory Muscle Forces: A Proof of Concept

Fatigue Properties of Ti Alloys with an Ultrafine Grained Structure: Challenges and Achievements

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