Biomechanical analysis of printable functionally graded material (FGM) dental implants for different bone densities

Ouldyerou, Abdelhak; Mehboob, Hassan; Merdji, Ali; Aminallah, L.; Mehboob, Ali; Mukdadi, Osama M.

doi:10.1016/j.compbiomed.2022.106111

Cited by 33 publications

(8 citation statements)

References 53 publications

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“…Thus, finite element methods have been used to study and simulate bone remodeling phenomena [28][29][30][31][32]. This tool is increasingly popular in biomechanics [33][34][35][36][37][38] for obtaining stress and strain prediction in the host bones.…”

Section: Introductionmentioning

confidence: 99%

Biomechanical Investigation of Patient-Specific Porous Dental Implants: A Finite Element Study

2023

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The design of the implant and osseointegration play an important role in the long-term stability of implants. This study aims to investigate the impact of porous implants on full and partial osseointegration in varying bone qualities. Finite element models of porous implants were modeled and assembled with normal and weak bones considering full and partial osseointegration. These assemblies were simulated under an occlusal load of 200 N when the outer surfaces of bones were fixed in all directions. The results showed that in the case of full osseointegration, the stresses in surrounding bones were increased with decreasing implant stiffness, while decreased in partial osseointegration. Moreover, the maximum octahedral shear strain in the weak bone exceeded 3000 µε in all the cases but decreased (from 7256 to 3632 µε) with decreasing implant stiffness. According to the mechanostat hypothesis, using porous implants in normal bone may enhance bone density in full osseointegration, while susceptivity of bone damage may reduce in weak bones using porous implants. Thus, careful selection of implant material and design based on the patient’s specific bone quality is crucial for successful outcomes.

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Section: Introductionmentioning

confidence: 99%

Biomechanical Investigation of Patient-Specific Porous Dental Implants: A Finite Element Study

2023

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“…The finite element model consists of 11,807,170 tetra4 solids elements and 1,374,437 tria3 shell elements (Table 1 ), for an average element size of 0.5 mm. The model is defined as linear elastic, homogeneous and isotropic [ 14 , 15 , 25 ]. The material properties are listed in Table 1 [ 24 , 26 ].…”

Section: Methodsmentioning

confidence: 99%

Biomechanical evaluation of a healed acetabulum with internal fixators: finite element analysis

et al. 2023

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Background Treatment of complicated acetabular fracture with internal fixation usually has high risk of failure because of unbefitting fixation. However, evaluation of the biomechanical effect of internal fixation under physiological loading for fracture healing is still generally rarely performed. The purpose of this study is to analyze the biomechanical characteristics of a healed acetabulum with designed internal fixators under gait and to explore the biomechanical relationship between the healed bone and the internal fixator. Methods A patient-specific finite element model of whole pelvis with designed internal fixators was constructed based on the tomographic digital images, in which the spring element was used to simulate the main ligaments of the pelvis. And the finite element analysis under both the combination loading of different phases and the individual loading of each phase during the gait cycle was carried out. The displacement, von Mises stress, and strain energy of both the healed bone and the fixation were calculated to evaluate the biomechanical characteristics of the healed pelvis. Results Under the combination loading of gait, the maximum difference of displacement between the left hip bone with serious injury and the right hip bone with minor injury is 0.122 mm, and the maximum stress of the left and right hemi-pelvis is 115.5 MPa and 124.28 MPa, respectively. Moreover, the differences of average stress between the bone and internal fixators are in the range of 2.3–13.7 MPa. During the eight phases of gait, the stress distribution of the left and right hip bone is similar. Meanwhile, based on the acetabular three-column theory, the strain energy ratio of the central column is relatively large in stance phases, while the anterior column and posterior column of the acetabular three-column increase in swing phases. Conclusions The acetabular internal fixators designed by according to the anatomical feature of the acetabulum are integrated into the normal physiological stress conduction of the pelvis. The design and placement of the acetabular internal fixation conforming to the biomechanical characteristics of the bone is beneficial to the anatomical reduction and effective fixation of the fracture, especially for complex acetabular fracture.

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“…The screw model is a homogeneous, continuous, isotropic, and linearly elastic material [ 17 , 18 ]. Bone is also considered to be homogeneous, isotropic, and linearly elastic [ 28 ]. In the screw–bone cement–bone model, friction contact exists between the screw, bone cement, and bone block [ 18 , 29 ].…”

Section: Methodsmentioning

confidence: 99%

Second-generation bone cement-injectable cannulated pedicle screws for osteoporosis: biomechanical and finite element analyses

Song

Xiao³

et al. 2023

J Orthop Surg Res

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Background Biomechanical and finite element analyses were performed to investigate the efficacy of second-generation bone cement-injectable cannulated pedicle screws (CICPS) in osteoporosis. Methods This study used the biomechanical test module of polyurethane to simulate osteoporotic cancellous bone. Polymethylmethacrylate (PMMA) bone cement was used to anchor the pedicle screws in the module. The specimens were divided into two groups for the mechanical tests: the experimental group (second-generation CICPS) and control group (first-generation CICPS). Safety was evaluated using maximum shear force, static bending, and dynamic bending tests. Biomechanical stability evaluations included the maximum axial pullout force and rotary torque tests. X-ray imaging and computed tomography were used to evaluate the distribution of bone cement 24 h after PMMA injection, and stress distribution at the screw fracture and screw–cement–bone interface was assessed using finite element analysis. Results Mechanical testing revealed that the experimental group (349.8 ± 28.6 N) had a higher maximum axial pullout force than the control group (277.3 ± 8.6 N; P < 0.05). The bending moments of the experimental group (128.5 ± 9.08 N) were comparable to those of the control group (113.4 ± 20.9 N; P > 0.05). The screw-in and spin-out torques of the experimental group were higher than those of the control group (spin-in, 0.793 ± 0.015 vs. 0.577 ± 0.062 N, P < 0.01; spin-out, 0.764 ± 0.027 vs. 0.612 ± 0.049 N, P < 0.01). Bone cement was mainly distributed at the front three-fifths of the screw in both groups, but the distribution was more uniform in the experimental group than in the control group. After pullout, the bone cement was closely connected to the screw, without loosening or fragmentation. In the finite element analysis, stress on the second-generation CICPS was concentrated at the proximal screw outlet, whereas stress on the first-generation CICPS was concentrated at the screw neck, and the screw–bone cement–bone interface stress of the experimental group was smaller than that of the control group. Conclusion These findings suggest that second-generation CICPS have higher safety and stability than first-generation CICPS and may be a superior choice for the treatment of osteoporosis.

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Biomechanical analysis of printable functionally graded material (FGM) dental implants for different bone densities

Cited by 33 publications

References 53 publications

Biomechanical Investigation of Patient-Specific Porous Dental Implants: A Finite Element Study

Biomechanical Investigation of Patient-Specific Porous Dental Implants: A Finite Element Study

Biomechanical evaluation of a healed acetabulum with internal fixators: finite element analysis

Second-generation bone cement-injectable cannulated pedicle screws for osteoporosis: biomechanical and finite element analyses

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