Finite Element Analysis of Bone Stress around Micro-Implants of Different Diameters and Lengths with Application of a Single or Composite Torque Force

Lü, Yong; Chang, Shaohai; Ye, Jiantao; Ye, Yushan; Yu, Yijun

doi:10.1371/journal.pone.0144744

Cited by 21 publications

(19 citation statements)

References 22 publications

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“…The insertion torque (maximum rotations) in the same artificial bone for various lengths of OASs in the predrilled hole increased as the number of threads increased, i.e., as the length of the OAS increased. This result coincides with previous studies [ 8 , 34 , 35 , 36 , 37 , 38 ]. However, this phenomenon was not observed in the Grade 30 artificial bone ( Table 2 ).…”

Section: Discussionsupporting

confidence: 94%

“…Some similar results were observed for the manual anchorage method, i.e., during the four rotations and the maximum rotations, the insertion torque increased as the bone density increased ( p < 0.05). which coincides with previous experimental and simulative studies [ 27 , 34 , 36 , 38 , 39 ]. Furthermore, the insertion torque during the four rotations varied significantly with the OAS length, except for the Grade 40 bone.…”

Section: Discussionsupporting

confidence: 93%

See 1 more Smart Citation

Influence of Orthodontic Anchor Screw Anchorage Method on the Stability of Artificial Bone: An In Vitro Study

Kang

Hyoungsik

et al. 2020

Materials

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This study aims to compare the torque values for various lengths of the titanium-based orthodontic anchor screw (OAS), different anchorage methods and varying artificial bone densities after predrilling. Furthermore, the effects of these parameters on bone stability are evaluated. A total of 144 OASs were prepared with a diameter of 1.6 mm and heights of 6, 8 and 10 mm. Artificial bones were selected according to their density, corresponding to Grades 50, 40 and 30. Torque values for the automatic device and manual anchorage methods exhibited a statistically significant difference for the same-sized OAS, according to the bone density of the artificial bones (p < 0.05). However, when insertion torque was at the maximum rotations, there was no significant difference in the torque values for the Grade 30 artificial bone (p > 0.05). When the torque values of both anchorage methods were statistically compared with the mean difference for each group, the results of the manual anchorage method were significantly higher than those of the automatic device anchorage method (p < 0.05). A statistically significant difference was observed in the bone stability resulting from different OAS anchorage methods and artificial bone lengths. These findings suggest that the automatic anchorage method should be used when fixing the OAS.

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Section: Discussionsupporting

confidence: 94%

Section: Discussionsupporting

confidence: 93%

Influence of Orthodontic Anchor Screw Anchorage Method on the Stability of Artificial Bone: An In Vitro Study

Kang

Hyoungsik

et al. 2020

Materials

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“…The way in which loads are transmitted to the surrounding bone is the key factor for success or failure of the dental implant. Between different mathematical methods which can evaluate stress distribution within bone supporting dental implants, finite element analysis (FEA) is usually used in dentistry to evaluate the influence of clinical agents on the survival of implant placement, and also to predict the biomechanical status correlated with the different dental implant and alveolar bone conditions [ 5 ]. FEA allows the prediction of the stress distribution in the contact area of the implants with cortical bone, and around the apex of the implants in the surrounding bone.…”

Section: Introductionmentioning

confidence: 99%

Angulated Dental Implants in Posterior Maxilla FEA and Experimental Verification

Hamed¹,

Marzook²,

Ghoneem³

et al. 2018

Open Access Maced J Med Sci

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AIM: This study aimed to evaluate the effect of different implant angulations in posterior maxilla on stress distribution by finite element analysis and verify its results experimentally. METHODS:Two simplified models were prepared for an implant placed vertically and tilted 25° piercing the maxillary sinus. Geometric models' components were prepared by Autodesk Inventor then assembled in ANSYS for finite element analysis. The results of finite element analysis were verified against experimental trials results which were statistically analysed using student t-test (level of significance p < 0.05). RESULTS:Implant -abutment complex absorbed the load energy in case of vertical implant better than the case of angulated one. That was reflected on cortical bone stress, while both cases showed stress levels within the physiological limits. Comparing results between FEA and experiment trials showed full agreement. CONCLUSION:It was found that the tilted implant by 25° can be utilised in the posterior region maxilla for replacing maxillary first molar avoiding sinus penetration. The implant-bone interface and peri-implant bones received the highest Von Mises stress. Implant -bone interface with angulated implant received about 66% more stresses than the straight one.

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“…In particular, mechanical stresses concentrate on the marginal bone around dental implants [ 1 ], suggesting that the maintenance of marginal bone levels for the long-term is important for successful clinical outcomes. To determine the effects of mechanical stimulation on bone around dental implants, finite element analyses have been mainly used [ 2 – 4 ]. Moreover, some studies have reported the effects on the jaw bone around implants using occlusal forces [ 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of mechanical repetitive load on bone quality around implants in rat maxillae

Uto¹,

Kuroshima²,

Nakano³

et al. 2017

PLoS ONE

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Greater understanding and acceptance of the new concept “bone quality”, which was proposed by the National Institutes of Health and is based on bone cells and collagen fibers, are required. The novel protein Semaphorin3A (Sema3A) is associated with osteoprotection by regulating bone cells. The aims of this study were to investigate the effects of mechanical loads on Sema3A production and bone quality based on bone cells and collagen fibers around implants in rat maxillae. Grade IV-titanium threaded implants were placed at 4 weeks post-extraction in maxillary first molars. Implants received mechanical loads (10 N, 3 Hz for 1800 cycles, 2 days/week) for 5 weeks from 3 weeks post-implant placement to minimize the effects of wound healing processes by implant placement. Bone structures, bone mineral density (BMD), Sema3A production and bone quality based on bone cells and collagen fibers were analyzed using microcomputed tomography, histomorphometry, immunohistomorphometry, polarized light microscopy and birefringence measurement system inside of the first and second thread (designated as thread A and B, respectively), as mechanical stresses are concentrated and differently distributed on the first two threads from the implant neck. Mechanical load significantly increased BMD, but not bone volume around implants. Inside thread B, but not thread A, mechanical load significantly accelerated Sema3A production with increased number of osteoblasts and osteocytes, and enhanced production of both type I and III collagen. Moreover, mechanical load also significantly induced preferential alignment of collagen fibers in the lower flank of thread B. These data demonstrate that mechanical load has different effects on Sema3A production and bone quality based on bone cells and collagen fibers between the inside threads of A and B. Mechanical load-induced Sema3A production may be differentially regulated by the type of bone structure or distinct stress distribution, resulting in control of bone quality around implants in jaw bones.

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Finite Element Analysis of Bone Stress around Micro-Implants of Different Diameters and Lengths with Application of a Single or Composite Torque Force

Cited by 21 publications

References 22 publications

Influence of Orthodontic Anchor Screw Anchorage Method on the Stability of Artificial Bone: An In Vitro Study

Influence of Orthodontic Anchor Screw Anchorage Method on the Stability of Artificial Bone: An In Vitro Study

Angulated Dental Implants in Posterior Maxilla FEA and Experimental Verification

Effects of mechanical repetitive load on bone quality around implants in rat maxillae

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