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. 2023 Mar 20;10(3):379.
doi: 10.3390/bioengineering10030379.

Nanoscale Chemical Surface Analyses of Recycled Powder for Direct Metal Powder Bed Fusion Ti-6Al-4V Root Analog Dental Implant: An X-ray Photoelectron Spectroscopy Study

Anastasia Matsko  1 , Nader Shaker  2 , Ana Carla B C J Fernandes  3 , Asmaa Haimeur  2 , Rodrigo França  2
Affiliations

Nanoscale Chemical Surface Analyses of Recycled Powder for Direct Metal Powder Bed Fusion Ti-6Al-4V Root Analog Dental Implant: An X-ray Photoelectron Spectroscopy Study

Anastasia Matsko et al. Bioengineering (Basel). .

Abstract

Over the past couple of decades, additive manufacturing and the use of root-analogue-printed titanium dental implants have been developed. Not all powder particles are sintered into the final product during the additive manufacturing process. Reuse of the remaining powder could reduce the overall implant manufacturing cost. However, Ti-6Al-4V powder particles are affected by heat, mechanical factors, and oxidization during the powder bed fusion manufacturing process. Degradation of the powder may harm the final surface composition and decrease the biocompatibility and survival of the implant. The uncertainty of the recycled powder properties prevents implant fabrication facilities from reusing the powder. This study investigates the chemical composition of controlled, clean, and recycled titanium alloy powder and root-analogue implants (RAI) manufactured from these powders at three different depths. The change in titanium's quantity, oxidization state, and chemical composition in powder and RAI implants have been demonstrated and analyzed. While not identical, the surface chemical composition of the recycled powder implant and the implant manufactured from unused powder are similar. The results also indicate the presence of TiO2 on all surfaces. Many studies confirmed that titanium dioxide on the implant's surface correlates with better osteointegration, reduced bacterial infection, and increased corrosion resistance. Considering economic and environmental aspects, surface chemical composition comparison of clean and reused powder is crucial for the future manufacturing of cost-effective and biocompatible implants.

Keywords: Ti-6Al-4V; additive manufacturing; implant surface composition; laser sintering; reused powder; titanium implants.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
The atomic percentage of the major elements of the samples at three probed depths.
Figure 2
Figure 2
Ti/Al ratio average of the four experimental conditions, showing a significate difference at 10 nm for Implant_C.
Figure 3
Figure 3
High-resolution XPS results for Ti 2p peak, according to the probed depth. Ti 2p is composed of two spin-orbit peaks: Ti 2p3/2 and Ti 2p1/2. The Ti 2p3/2 peak sifting from 0 nm to other experimental conditions was noticeable.
Figure 4
Figure 4
XPS high-resolution peak of oxygen peak O 1s at 0 nm for Powder_U samples. The three major contributions are O 1s_A, O 1s_B, and O 1s_C.
Figure 5
Figure 5
SEM images of the Ti6Al4V alloy powder and the surface of the Ti6Al4V implants.
See this image and copyright information in PMC

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