Fatigue of Dental Implants: Facts and Fallacies

Shemtov‐Yona, Keren; Rittel, D.

doi:10.3390/dj4020016

Cited by 43 publications

(50 citation statements)

References 26 publications

(27 reference statements)

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“…The Dental implants are subjected to variable loads during their life span due to mastication or other reasons, as bruxism for example, which may lead to structural failure due to fatigue [7]. In fact, clinical studies report that the vast majority of implant restoration mechanical failures are caused by fatigue [8]. These failures can take place in the abutment, in the implant body or in the prosthetic screw depending on implant diameter, load case, implant position, etc.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Design of Dental Implant Assemblies: A Nominal Stress Approach

Armentia

Abasolo

Coria

et al. 2020

Metals

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Fatigue is the most common mechanical failure type in dental implants. ISO 14801 standardizes fatigue testing of dental implants, providing the load-life curve which is most useful for comparing the fatigue behavior of different dental implant designs. Based on it, many works were published in the dental implant literature, comparing different materials, component geometries, connection types, surface treatments, etc. These works are useful for clinicians in order to identify the best options available in the market. The present work is intended not for clinicians but for dental implant manufacturers, developing a design tool that combines Finite Element Analysis, fatigue formulation and ISO 14801 experimental tests. For that purpose, 46 experimental tests were performed on BTI INTERNA® IIPSCA4513 implants joined with INPPTU44 abutments by means of INTTUH prosthetic screws under three different tightening torque magnitudes. Then, the load case was reproduced in a FE model from where the nominal stress state in the fatigue critical section was worked out. Finally, Walker criterion was used to represent accurately the effects of mean stress and predict fatigue life of the studied dental implant assembly, which can be extended to most of the products of BTI manufacturer. By means of this tool, dental implant manufacturers will be able to identify the critical design and assembly parameters in terms of fatigue behavior, evaluate their influence in preliminary design stages and consequently design dental implants with significantly better fatigue response which in turn will reduce future clinical incidences.

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Section: Introductionmentioning

confidence: 99%

Fatigue Design of Dental Implant Assemblies: A Nominal Stress Approach

Armentia

Abasolo

Coria

et al. 2020

Metals

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show abstract

“…Coils may be present or not [30,31,32,33,34,35,36,37,38,39,40]. The function of the loops is to efficiently distribute the masticatory load and to guarantee stability in the early post-surgical phases of the implant [41,42,43]. On the other hand, secondary or surface geometries are the basis of the osseointegration potential of the implant.…”

Section: Methodsmentioning

confidence: 99%

Sandblasted and Acid Etched Titanium Dental Implant Surfaces Systematic Review and Confocal Microscopy Evaluation

et al. 2019

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The field of dental implantology has made progress in recent years, allowing safer and predictable oral rehabilitations. Surely the rehabilitation times have also been reduced, thanks to the advent of the new implant surfaces, which favour the osseointegration phases and allow the clinician to rehabilitate their patients earlier. To carry out this study, a search was conducted in the Pubmed, Embase and Elsevier databases; the articles initially obtained according to the keywords used numbered 283, and then subsequently reduced to 10 once the inclusion and exclusion criteria were applied. The review that has been carried out on this type of surface allows us to fully understand the features and above all to evaluate all the advantages or not related. The study materials also are supported by a manufacturing company, which provided all the indications regarding surface treatment and confocal microscopy scans. In conclusion, we can say that, thanks to these new surfaces, it has been possible to shorten the time necessary to obtain osseointegration and, therefore, secondary stability on the part of implants. The surfaces, therefore, guarantee an improved cellular adhesion and thanks to the excellent wettability all the biological processes that derive from it, such as increases in the exposed implant surface, resulting in an increase in bone-implant contact (BIC).

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“…The fatigue testing consisted of random spectrum loading, a technique that has been exposed in detail previously [27,29,30] so that it will only be briefly detailed here. The main idea is to apply random loading cycles in a range of selected loads (P) from 0 to Pmax, at frequencies that vary from 0 Hz (pause of variable duration) up to 3 Hz.…”

Section: Methodsmentioning

confidence: 99%

Fractographic characterization of fatigued zirconia dental implants tested in room air and saline solution

Shemtov‐Yona

Özcan

Rittel

2019

Engineering Failure Analysis

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The identification of the fractographic signature of monotonic and fatigue loads in ceramic materials is far from being straightforward, as embodied in a subtle blend of cleavage (trans.) and intergranular fracture. As of today, most fractographic analyses are carried out at low/middle magnifications. In this research, we have systematically examined commercial zirconia dental implants that were fractured in the laboratory under monotonic overload and random spectrum fatigue, thus generating a bank of well controlled fractured reference specimens. The tests were carried out in both room air and in 0.9% saline solution. Our results show that it is difficult to distinguish static fracture in room air from saline solution. By contrast, spectrum fatigue in either air or saline solution, results in observable differences from dominantly trans. to a mixed trans.-intergranular fracture at the origin of the crack (first 60 m, as an upper bound value). Further down the unstable propagation zone, an increased tendency for intergranular fracture is observed, which seems to be exacerbated by the saline solution when compared with room air. Overall, it is observed that static and fatigue fractures can be distinguished from one another. It is believed that this fractographic database will serve as a reference for future analyses of broken ceramic dental implants and identification of their fracture mechanism.

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Fatigue of Dental Implants: Facts and Fallacies

Cited by 43 publications

References 26 publications

Fatigue Design of Dental Implant Assemblies: A Nominal Stress Approach

Fatigue Design of Dental Implant Assemblies: A Nominal Stress Approach

Sandblasted and Acid Etched Titanium Dental Implant Surfaces Systematic Review and Confocal Microscopy Evaluation

Fractographic characterization of fatigued zirconia dental implants tested in room air and saline solution

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