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A study on the mechanical characteristics of the EBM-printed Ti-6Al-4V LCP plates in vitro.

Liu PC, Yang YJ, Liu R, Shu HX, Gong JP, Yang Y, Sun Q, Wu X, Cai M - J Orthop Surg Res (2014)

Bottom Line: The results show significant differences in bending stiffness, bending strength, bending structural stiffness, and hardness between the samples using EBM and the original LCP plates.The EBM samples' bending stiffness was 87.67%, which is greater than using the LCP plates'; and the bending strength was 190.7% greater, the bending structural stiffness was 73.2% greater, and the hardness was 27.9% greater.The results show that the EBM plates' general mechanical strength was significantly greater than the LCP plates.

View Article: PubMed Central - PubMed

Affiliation: Department of Orthopaedics, Shanghai Tenth People's Hospital, Tongji University School of Medicine, No,301, Middle Yanchang Road, Shanghai 200072, China. orthopedics_dsyy@126.com.

ABSTRACT

Purpose: The electron beam melting (EBM) Ti-6Al-4V material technology has been developed over a short time period. It was introduced through a research to develop Ti-6Al-4V implants for patients, but EBM printed locking compression plates have not been used for clinical implants. The main purpose of this study is to find whether the EBM Ti-6Al-4V plate suit for clinical implants.

Methods: First, we scanned an AO-locking compression plate (LCP) and printed LCP samples using EBM. Next, we evaluated the EBM plate surface roughness through optical microscopy as well as the LCP and EBM plates' mechanical characteristics using the ASTM standard, which is commonly used to test the mechanical properties of bone plates subject to bending. Each sample was examined using a single-cycle four-point bending test and hardness testing to acquire data on bending stiffness, bending strength, bending structural stiffness, and hardness.

Results: The results show significant differences in bending stiffness, bending strength, bending structural stiffness, and hardness between the samples using EBM and the original LCP plates. The EBM-printed samples' surface roughness was 0.49 ± 0.02 μm. The mean hardness of the LCP sample was 266.67 HV10 ± 5.8, and the EBM-printed sample mean hardness was 341.1 HV10 ± 1.93. The EBM samples' bending stiffness was 87.67%, which is greater than using the LCP plates'; and the bending strength was 190.7% greater, the bending structural stiffness was 73.2% greater, and the hardness was 27.9% greater.

Conclusions: The results show that the EBM plates' general mechanical strength was significantly greater than the LCP plates. An EBM plate is advantageous for clinical implants because it can be customized with great potential for improvement.

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Related in: MedlinePlus

The EBM-printed Ti-6Al-4V LCP plate.
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Fig1: The EBM-printed Ti-6Al-4V LCP plate.

Mentions: The LCP superior anterior clavicle plate (04.112.006; Synthes; USA) was scanned using a 3D scanner (three-dimensional sensing system; Digital Media Factory, Shanghai, China) with a 0.2-mm accuracy. Next, Geomagic Studio (Geomagic; USA) was used to import the scan as a computer-aided design (CAD) model and convert it to the *.stl file format. The stereolithography (STL) format file was inspected using Magics (Materialise; Belgium) for repair data processing. The STL file was generated without error; next, it was printed using a 3D printer (Electron Beam Melting A1; Arcam AB; Sweden). Titanium Ti6Al4V powder (Arcam AB; Sweden) was used as the printing material, and the metal powder was bombarded with a high energy electron beam layer-by-layer during the printing process; the shapes were controlled through the three-dimensional CAD using an electron beam melting system for enhanced melting and productivity. The implant can be placed in a vacuum chamber for low stress on the implant; its performance is superior to implant casting as well as forging, and the beam can be close to the implant. Printing was performed at the ambient temperature of 750°C, current I =11.5 A, and voltage V =60 KV; three samples were printed. The EBM samples are shown in Figure 1.Figure 1


A study on the mechanical characteristics of the EBM-printed Ti-6Al-4V LCP plates in vitro.

Liu PC, Yang YJ, Liu R, Shu HX, Gong JP, Yang Y, Sun Q, Wu X, Cai M - J Orthop Surg Res (2014)

The EBM-printed Ti-6Al-4V LCP plate.
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4221727&req=5

Fig1: The EBM-printed Ti-6Al-4V LCP plate.
Mentions: The LCP superior anterior clavicle plate (04.112.006; Synthes; USA) was scanned using a 3D scanner (three-dimensional sensing system; Digital Media Factory, Shanghai, China) with a 0.2-mm accuracy. Next, Geomagic Studio (Geomagic; USA) was used to import the scan as a computer-aided design (CAD) model and convert it to the *.stl file format. The stereolithography (STL) format file was inspected using Magics (Materialise; Belgium) for repair data processing. The STL file was generated without error; next, it was printed using a 3D printer (Electron Beam Melting A1; Arcam AB; Sweden). Titanium Ti6Al4V powder (Arcam AB; Sweden) was used as the printing material, and the metal powder was bombarded with a high energy electron beam layer-by-layer during the printing process; the shapes were controlled through the three-dimensional CAD using an electron beam melting system for enhanced melting and productivity. The implant can be placed in a vacuum chamber for low stress on the implant; its performance is superior to implant casting as well as forging, and the beam can be close to the implant. Printing was performed at the ambient temperature of 750°C, current I =11.5 A, and voltage V =60 KV; three samples were printed. The EBM samples are shown in Figure 1.Figure 1

Bottom Line: The results show significant differences in bending stiffness, bending strength, bending structural stiffness, and hardness between the samples using EBM and the original LCP plates.The EBM samples' bending stiffness was 87.67%, which is greater than using the LCP plates'; and the bending strength was 190.7% greater, the bending structural stiffness was 73.2% greater, and the hardness was 27.9% greater.The results show that the EBM plates' general mechanical strength was significantly greater than the LCP plates.

View Article: PubMed Central - PubMed

Affiliation: Department of Orthopaedics, Shanghai Tenth People's Hospital, Tongji University School of Medicine, No,301, Middle Yanchang Road, Shanghai 200072, China. orthopedics_dsyy@126.com.

ABSTRACT

Purpose: The electron beam melting (EBM) Ti-6Al-4V material technology has been developed over a short time period. It was introduced through a research to develop Ti-6Al-4V implants for patients, but EBM printed locking compression plates have not been used for clinical implants. The main purpose of this study is to find whether the EBM Ti-6Al-4V plate suit for clinical implants.

Methods: First, we scanned an AO-locking compression plate (LCP) and printed LCP samples using EBM. Next, we evaluated the EBM plate surface roughness through optical microscopy as well as the LCP and EBM plates' mechanical characteristics using the ASTM standard, which is commonly used to test the mechanical properties of bone plates subject to bending. Each sample was examined using a single-cycle four-point bending test and hardness testing to acquire data on bending stiffness, bending strength, bending structural stiffness, and hardness.

Results: The results show significant differences in bending stiffness, bending strength, bending structural stiffness, and hardness between the samples using EBM and the original LCP plates. The EBM-printed samples' surface roughness was 0.49 ± 0.02 μm. The mean hardness of the LCP sample was 266.67 HV10 ± 5.8, and the EBM-printed sample mean hardness was 341.1 HV10 ± 1.93. The EBM samples' bending stiffness was 87.67%, which is greater than using the LCP plates'; and the bending strength was 190.7% greater, the bending structural stiffness was 73.2% greater, and the hardness was 27.9% greater.

Conclusions: The results show that the EBM plates' general mechanical strength was significantly greater than the LCP plates. An EBM plate is advantageous for clinical implants because it can be customized with great potential for improvement.

Show MeSH
Related in: MedlinePlus