Half pins stress shielding interaction behavior at implant-bone interface

Ibrahim, Nur Fatin Izzati; Daud, Ruslizam; Hassan, Muhamad Khairul Ali; Zain, Noor Alia Md; Bajuri, Mohd Yazid

doi:10.30880/ijie.2018.10.05.030

Cited by 4 publications

(5 citation statements)

References 6 publications

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“…This indicates that titanium alloy Ti-6Al-4V gave better load transfer between the bone and the screw fixation compared to stainless steel A316 based on STP values. The similar observation is found in previous research where it compares effect of pins materials on average STPs, it found the percentage difference of the STP value is 0 to 23.5% between stainless steel and titanium alloy of half pin uniaxial external fixation [30]. The present study found that a screw material with a lower Young's modulus results in improved load transfer, as evidenced by the calculated stress-transfer parameter (STP) values.…”

Section: Resultssupporting

confidence: 91%

“…This means that the longest screw length transfers the most amount of stress to the surrounding bone through the bone-screw interface as shown in Figure 7. These findings are in line with those found in the literature, where critical stress seems to yield at the thread location [11] and material with elastic modulus of 45 GPa produce lower stress compared to 193 GPa of elastic modulus [30].…”

Section: Stress and Strain Distributionsupporting

confidence: 93%

“…To characterize this stress transfer, stress transfer parameters (STP) was applied to evaluate the load transfer between the bone and the screw fixation. STP is defined as a ratio of von Mises stress transferred to bone, 𝜎 𝑏 versus the stress in the adjacent screw thread, 𝜎 𝑡 [30]. The STP of mechanical stimuli between screw and bone is computed after the simulation using following equations [31]:…”

Section: Methodsmentioning

confidence: 99%

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Stress Shielding Prediction of Unicortical and Bicortical Screws: A Finite Element Analysis

Djanali¹

2023

JMechE

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The stability in an implant fixation plays a vital role in ensuring proper formation and remodelling process of the fractured bone. Failure in implant fixation is commonly associated with short- and long-term instability of the bone-implant interface. The bone-implant interaction creates a complicated mechanical interplay that might influence the stress distribution and hence the biomechanical performance stability of the implant fixation. Furthermore, implant screw parameters namely thread size, geometrical design and material properties become additional factors that affect the bone-implant interaction. The purpose of this study was to investigate the effect of unicortical and bicortical screws’ parameters on the screw-bone interaction mechanism. To evaluate the stress transfers between screw and bone, the stress parameters namely stress transfer parameters (STP) was employed. A two-dimensional (2D) finite element model of full treaded screw was simulated while varying the parameters of the screw: two types of material (stainless steel A316 and titanium alloy Ti-6Al-4V), screw length and screw pitch. It was found that the lower in elastic modulus results to the higher stress transfer between implant- bone interface. As the titanium have lower elastic modulus, it gave higher values of STP which help to transmit and distribute stress better compared to the stainless steel. While the effect of varying screw pitch between two types of screws shows that STPs values of fully threaded bicortical screws shows significant result for finer pitch size that may advancing bone remodelling process at the early stage.

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Section: Resultssupporting

confidence: 91%

Section: Stress and Strain Distributionsupporting

confidence: 93%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Stress Shielding Prediction of Unicortical and Bicortical Screws: A Finite Element Analysis

Djanali¹

2023

JMechE

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“…The femoral shafts were fractured at Arizona State University's Computational and Experimental Mechanics Research Facility using a Columbus McKinnon (CM) Drop Test Frame. A three‐point bending setup with pin‐to‐pin support was used to approximate femoral fixation between the acetabular and knee joints in vivo (Video 1) [33, 34]. The span between the support pins created the bending moment to which each sample was subjected: the greater the span, the larger the maximum bending moment.…”

Section: Methodsmentioning

confidence: 99%

Section: Ta B L E 1 Bone Fractography Definitionsmentioning

confidence: 99%

Do bone elasticity and postmortem interval affect forensic fractographic analyses?

Skinner

Langley

Joseph

et al. 2023

Journal of Forensic Sciences

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Forensic fractographic features of bone reliably establish crack propagation in perimortem injuries. We investigated if similar fracture surface features characterize postmortem fractures. Experimentally induced peri‐ and postmortem fractures were used to assess if fractographic features vary as bone elasticity decreases during the postmortem interval (PMI). Thirty‐seven unembalmed, defleshed human femoral shafts from males and females aged 33–81 years were fractured at varying PMIs with a drop test frame using a three‐point bending setup and recorded with a high‐speed camera. Vital statistics, cause of death, PMI length, temperature, humidity, collagen percentage, water loss, fracture energy, and fractography scores were recorded for each sample. Results showed that fractographic features associated with perimortem fractures were expressed in PMIs up to 40,600 accumulated degree hours (ADH), or 60 warm weather days. Hackle was the most consistently expressed feature, occurring in all fractures regardless of ADH. The most variable characteristics were wake features (78.4%) and arrest ridges (70.3%). Collagen percentage did not correlate strongly with ADH (r = −0.04, p = 0.81); however, there was a strong significant correlation between ADH and water loss (r = 0.74, p < 0.001). Multinomial logistic regression showed no association between fractographic feature expression and ADH or collagen percentage. In conclusion, forensic fractographic features reliably determine initiation and directionality of crack propagation in experimentally induced PMIs up to 40,600 ADH, demonstrating the utility of this method into the recent postmortem interval. This expression of reliable fractographic features throughout the early PMI intimates these characteristics may not be useful standalone features for discerning peri‐ versus postmortem fractures.

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Analysis of insertion and removal torque loading for miniscrew and miniplate skeletal anchorage

Khor

Daud

Kamarrudin

et al. 2019

IOP Conf. Ser.: Mater. Sci. Eng.

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Mini-Implant such as miniscrew and miniplate is used as a stabilizer in stable the crack occurs at the mandibular bone and maxillary bone for recovery. Reducing the screw loosening may reduce the trauma of insertion and removal that able to increase the rates of osseointegration. This paper presents the investigation of stress transfer between the interaction mini-implant and bone during applied in insertion and removal torque regards to stress distribution between mini-implant and bones. The finite element simulation involves three different materials mini-implant such as Titanium Alloy, (TiA), Stainless Steel, (SS) and Magnesium Alloy, (MgA). The result identified that the best material of mini-implant used to insert at mandibular bone is Titanium, (TiA) with the moment of 90 Nmm to perform high 0.70 STP value and average SEDTP of 2.60 compared to other materials. Whereas, for the material of mini-implant used to inserted at maxillary bone is Magnesium Alloy, (MgA) with the moment of 100 Nmm to perform high 1.11 STP value and average SEDTP of 1.20.

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Half pins stress shielding interaction behavior at implant-bone interface

Cited by 4 publications

References 6 publications

Stress Shielding Prediction of Unicortical and Bicortical Screws: A Finite Element Analysis

Stress Shielding Prediction of Unicortical and Bicortical Screws: A Finite Element Analysis

Do bone elasticity and postmortem interval affect forensic fractographic analyses?

Analysis of insertion and removal torque loading for miniscrew and miniplate skeletal anchorage

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