Publication detail

Hydroxyapatite-Resin Composites Produced by Vat Photopolymerization and Post-Processing via In Situ Hydrolysis of Alpha Tricalcium Phosphate

OLIVER URRUTIA, C. DROTÁROVÁ, L. GASCÓN-PÉREZ, S. SLÁMEČKA, K. RAVASZOVÁ, S. ČELKO, L. MONTUFAR JIMENEZ, E.

Original Title

Hydroxyapatite-Resin Composites Produced by Vat Photopolymerization and Post-Processing via In Situ Hydrolysis of Alpha Tricalcium Phosphate

Type

journal article in Web of Science

Language

English

Original Abstract

Vat photopolymerization is an additive manufacturing technique that utilizes photosensitive resins to fabricate 3D polymeric objects with high precision. However, these objects often lack mechanical strength. This study investigated the strengthening of a resin based on epoxidized soybean oil acrylate, specifically designed for vat photopolymerization, by the in situ formation of hydroxyapatite nanocrystals. First, a stable alpha tricalcium phosphate (α-TCP)-resin feedstock mixture was developed (~30 vol.% α-TCP), which proved suitable for fabricating monoliths as well as complex triply periodic minimal surface (gyroid, diamond, and Schwarz) porous structures through vat photopolymerization. The results demonstrated that the incorporation of α-TCP particles led to a significant mechanical improvement of the resin. Second, post-printing hydrothermal treatments were utilized to transform the α-TCP particles into hydroxyapatite crystals within the resin. It was observed that the space between hydroxyapatite crystals within the composites was occupied by the cured resin, resulting in a more compact, stronger, and mechanically more reliable material than the porous hydroxyapatite produced by the hydrolysis of α-TCP mixed with water. Moreover, water absorption during the hydrothermal treatments caused the plasticization of the cured resin. As a consequence, the hydroxyapatite-resin composites displayed slightly lower mechanical properties compared to the as-printed α-TCP-resin composite.

Keywords

vat polymerization; alpha tricalcium phosphate; hydroxyapatite; porous composite; mechanical strength

Authors

OLIVER URRUTIA, C.; DROTÁROVÁ, L.; GASCÓN-PÉREZ, S.; SLÁMEČKA, K.; RAVASZOVÁ, S.; ČELKO, L.; MONTUFAR JIMENEZ, E.

Released

24. 11. 2023

Publisher

MDPI

Location

Switzerland

ISBN

2571-6131

Periodical

Ceramics-Switzerland

Year of study

6

Number

4

State

Swiss Confederation

Pages from

2282

Pages to

2294

Pages count

13

URL

https://www.mdpi.com/2571-6131/6/4/139

Full text in the Digital Library

http://hdl.handle.net/11012/245165

BibTex

@article{BUT185725,
  author="Carolina {Oliver Urrutia} and Lenka {Drotárová} and Sebastián {Gascón-Pérez} and Karel {Slámečka} and Simona {Ravaszová} and Ladislav {Čelko} and Edgar Benjamin {Montufar Jimenez}",
  title="Hydroxyapatite-Resin Composites Produced by Vat Photopolymerization and Post-Processing via In Situ Hydrolysis of Alpha Tricalcium Phosphate",
  journal="Ceramics-Switzerland",
  year="2023",
  volume="6",
  number="4",
  pages="2282--2294",
  doi="10.3390/ceramics6040139",
  issn="2571-6131",
  url="https://www.mdpi.com/2571-6131/6/4/139"
}