Effect of the geometry of butt-joint implant-supported restorations on the fatigue life of prosthetic screws

Armentia, Mikel; Abasolo, Mikel; Coria, Ibai; Sainitier, Nicolas

doi:10.1016/j.prosdent.2021.12.010

Cited by 4 publications

(2 citation statements)

References 52 publications

(74 reference statements)

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“…Irrespective of bone qualities, the distribution of high stress concentration was primarily observed in the cortical layer rather than in the cancellous bone. This seems contradict with some previous findings that stated the implant length is more responsible for mechanical responses at the cancellous bone compared to the cortical layer [28,29]. Although the bone-to-implant contact surface area was increased in both bone types by increasing the length of the implant, the influence of geometrical factor of the cortical bone (thickness) could not totally be disregarded as the level of bone stresses recorded was significantly affected.…”

Section: Discussioncontrasting

confidence: 84%

The Effect of Implant Length and Bone Quality on the Biomechanical Responses of Dental Implant and Surrounding Bone – A Three-Dimensional Finite Element Analysis

Muhammad Ikman Ishak,

Ruslizam Daud,

Siti Noor Fazliah Mohd Noor

et al. 2024

ARAM

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The robustness of dental implant systems in the context of occlusal restoration relies significantly on biomechanical factors associated with the imposition of excessive loads. These factors encompass the macro geometries of the implants, bone qualities, parafunctional oral habits, and specific materials employed. The choice of different implant lengths in different bone qualities may give rise to distinct effects on the way loads are distributed across the interface between the implant and the adjacent bone. As of now, the influence of implant length and bone quality on the surrounding tissues and the stability of implant structure continues to be a matter of debate and uncertainty, particularly in situations involving the possibility of implant failure. This study employed three-dimensional finite element analysis to investigate five distinct implant lengths (4, 6, 10, 13, and 15 mm) in two types of bone quality (type II and III). The bone tissues were characterized through the utilization of computed tomography image datasets and then underwent processing within the SolidWorks software. All geometric configurations were transformed into finite element models, which were subjected to analysis within the ANSYS software. Anisotropic and isotropic properties were attributed to the bone and implant models, respectively. A dynamic occlusal loading quantified at 300 N was applied to the implant body, accompanied by a pre-tension force of 20 N on the screw component. The longer implants exhibited decreased stress magnitudes in type II bone (87.86 – 36.66 MPa) and increased stress magnitudes in type III bone (80.5 – 2128.9 MPa) within the surrounding bone tissue, in comparison to the shorter implants. However, stress within the implant body was generally elevated with the use of longer implants in both bone types (type II: 505.32 – 625.35 MPa; type III: 500.45 – 2186.7 MPa). Irrespective of bone quality, the longer implants predominantly led to lower bone strain levels (type II: 0.006828 – 0.003328; type III: 0.054250 – 0.021678) and overall deformation of the implant-abutment assembly (type II: 0.1458 – 0.1348 μm; type III: 0.1754 – 0.1492 μm) compared to their shorter counterparts. Among all the assessed findings, type III bone displayed a more pronounced adverse impact on the biomechanical responses of the dental implant and neighbouring bone except for the implant stresses under the applied physiological loading.

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Section: Discussioncontrasting

confidence: 84%

The Effect of Implant Length and Bone Quality on the Biomechanical Responses of Dental Implant and Surrounding Bone – A Three-Dimensional Finite Element Analysis

Muhammad Ikman Ishak,

Ruslizam Daud,

Siti Noor Fazliah Mohd Noor

et al. 2024

ARAM

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“…Since there is no compensation provided by the cement space, MUA is challenged by a higher possibility of mechanical failure, especially in cases with signi cant divergent axes [16]. Compared to the abutment and implant components, Armentia et al [17] observed that the prosthesis screw was more vulnerable to mechanical problems, and Pjetursson et al [18] reported a 10.8% abutment screw loosening rate after a 5-year follow-up. For MUA, there are essentially two pieces of screw components (an abutment screw and a relatively smaller prosthesis screw) to tighten the transmucosal abutment and dental restoration.…”

Section: Introductionmentioning

confidence: 99%

Influence of horizontal forces on implants with different multi-unit abutment angulations: A finite element analysis

Lin,

Wen,

Guo

et al. 2024

Preprint

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Background Few studies have provided a detailed analysis of stress distribution on the components of multi-unit abutment (MUA). Our objective was to investigate the differences in stress patterns among MUA with different angulations under varies loading conditions. Methods Using finite element analysis, we constructed MUA-implant complexes with different abutment angulations (0°, 17°, and 30°). A static force of 200 N was applied along the axis of the prosthesis, accompanied by varying horizontal forces (0 N, 30 N, and 100 N). Results When subjected to a 200 N vertical load along the long axis of the prosthesis, implants with a 30° angulated abutment experienced nearly 2.5 times the stress (1185 MPa) compared to straight abutments (437 MPa). The maximum stress of the straight MUA-implant was 8 times higher under a 100 N horizontal force (2389 MPa) compared to that without horizontal force. Most of the stress was located near the first thread of the prosthesis screw, while screws loaded with horizontal force showed a higher stress around the screw head. Conclusions Increasing the abutment angulation leads to higher stress on the implant, which may be associated with potential bone loss. Horizontal forces significantly increase the maximum stress on the implant, particularly in the neck region. There is a distinct stress distribution pattern between the prosthesis screw and abutment screw.

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Multiaxial fatigue life assessment of dental implants

Armentia,

Abasolo,

Coria

et al. 2024

Heliyon

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Effect of the geometry of butt-joint implant-supported restorations on the fatigue life of prosthetic screws

Cited by 4 publications

References 52 publications

The Effect of Implant Length and Bone Quality on the Biomechanical Responses of Dental Implant and Surrounding Bone – A Three-Dimensional Finite Element Analysis

The Effect of Implant Length and Bone Quality on the Biomechanical Responses of Dental Implant and Surrounding Bone – A Three-Dimensional Finite Element Analysis

Influence of horizontal forces on implants with different multi-unit abutment angulations: A finite element analysis

Multiaxial fatigue life assessment of dental implants

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