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Related Experiment Video

Updated: May 28, 2026

Multi-material Ceramic-Based Components – Additive Manufacturing of Black-and-white Zirconia Components by Thermoplastic 3D-Printing (CerAM - T3DP)
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Meso-Scale Modifications in Additively Manufactured Zirconia: Topographical Design and Its Influence on Cell-Material

Sebastian Hetzler1, Stefan Rues1, Andreas Zenthöfer1

  • 1Department of Prosthodontics, Medical Faculty, Heidelberg University, Im Neuenheimer Feld 400, 69120 Heidelberg, Germany.

Bioengineering (Basel, Switzerland)
|May 27, 2026
PubMed
Summary

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This study examined how meso-scale surface structures on additively manufactured zirconia affect osteoblast behavior. Researchers used Digital Light Processing to create surfaces with columnar structures of varying spacing. They found that these structures increased early cell adhesion, with the strongest effect on surfaces with 160 µm spacing. However, proliferation rates were not significantly affected. Gene expression analysis showed that the effect on osteogenic differentiation varied depending on the zirconia type used. These findings suggest that meso-scale topographies can influence how cells interact with zirconia surfaces.

Area of Science:

  • Biomedical materials engineering
  • Tissue engineering
  • Additive manufacturing in dentistry

Background:

Additive manufacturing allows for the creation of zirconia-based devices with tailored surface features. However, the biological impact of meso-scale topographies on cell behavior is not fully understood. Prior research has shown that surface topography influences cell adhesion and differentiation. It was already known that zirconia is widely used in dental and orthopedic applications due to its mechanical properties. No prior work had resolved how specific meso-scale structures affect osteoblast responses. That uncertainty drove this investigation into how surface modifications influence osteoblast behavior. This gap motivated a focused in vitro analysis of cell-material interactions. The study aimed to clarify how these structures impact early cellular responses.

Purpose Of The Study:

The purpose of the study was to evaluate how meso-scale surface modifications affect osteoblast behavior on additively manufactured zirconia. The specific problem addressed was the lack of understanding about the biological effects of such topographies. The motivation stemmed from the need to optimize zirconia surfaces for biomedical applications. Researchers proposed that surface geometry could influence cell adhesion and differentiation. The study aimed to quantify these effects using in vitro models. The goal was to determine whether specific structures enhance early osteoblast adhesion and influence differentiation. The researchers also sought to assess whether these effects are material-dependent. The study focused on two zirconia types: 3Y-TZP and 5Y-PSZ.

Keywords:
3Y-TZP5Y-PSZadditive manufacturingcell–material interactiondental implantsdigital light processing (DLP)meso-scale surface topographyosteoblast adhesionosteogenic differentiationpersonalized dentistryregenerative medicinezirconiaadditive manufacturing zirconiameso-scale topographyosteoblast adhesionbiomedical materials

Frequently Asked Questions

Meso-scale structures significantly increase early osteoblast adhesion compared to planar surfaces, with Mod-160 showing the strongest effect.

The study tested 3Y-TZP and 5Y-PSZ, both fabricated using Digital Light Processing.

Mod-160 structures (100 µm height, 40 µm width, 160 µm spacing) showed the strongest adhesion effect, though the exact reason is not fully explained.

RT-qPCR was used to evaluate osteogenic differentiation by measuring gene expression of RUNX2, ALPL, COL1A1, and BGLAP.

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Main Methods:

Digital Light Processing (DLP) was used to fabricate zirconia specimens with defined meso-scale structures. The materials tested were 3Y-TZP and 5Y-PSZ, both commonly used in biomedical contexts. Surface modifications included columnar structures with varying center-to-center spacing. The structures were 100 µm in height and 40 µm in width. Three different spacings were tested: 80, 120, and 160 µm. Planar controls were also prepared for comparison. Cytotoxicity was assessed using elution testing to ensure material safety. Osteoblast adhesion and proliferation were measured using metabolic assays. Gene expression was analyzed via RT-qPCR to evaluate osteogenic differentiation.

Main Results:

Elution testing showed cell viability above 98% for all groups, indicating no cytotoxic effects. Early osteoblast adhesion was significantly increased on meso-scale surfaces compared to planar controls. The strongest adhesion effect was observed on Mod-160 structures. No significant differences in proliferation rates were detected across groups. Osteogenic differentiation was assessed using RT-qPCR for key markers. RUNX2, ALPL, COL1A1, and BGLAP were analyzed to track differentiation. On 3Y-TZP, Mod-160 surfaces showed sustained upregulation of BGLAP. In contrast, 5Y-PSZ exhibited less pronounced effects on gene expression.

Conclusions:

Meso-scale surface structuring of additively manufactured zirconia enhances early osteoblast adhesion. The strongest effect was observed on Mod-160 structures, according to the authors. No significant differences in proliferation were detected, as reported in the abstract. Osteogenic differentiation was influenced in a material-dependent manner. On 3Y-TZP, Mod-160 surfaces showed sustained upregulation of BGLAP. In contrast, 5Y-PSZ showed less pronounced effects on gene expression. These findings suggest that surface geometry impacts cell behavior. The study highlights the potential of meso-scale topographies to influence osteoblast responses.

No significant differences in proliferation rates were detected between groups.

On 3Y-TZP, Mod-160 surfaces showed sustained upregulation of BGLAP, while 5Y-PSZ showed less pronounced effects.