J Adv Prosthodont.  2018 Apr;10(2):147-154. 10.4047/jap.2018.10.2.147.

Analysis of osteogenic potential on 3mol% yttria-stabilized tetragonal zirconia polycrystals and two different niobium oxide containing zirconia ceramics

Affiliations
  • 1Department of Prosthodontics, School of Dentistry, Seoul National University, Seoul, Republic of Korea. proshan@snu.ac.kr
  • 2Department of Periodontology, School of Dentistry and Dental Research Institute, BK21 Program, Seoul National University, Seoul, Republic of Korea.
  • 3Department of Advanced Materials Engineering, Sejong University, Seoul, Republic of Korea.

Abstract

PURPOSE
This study was performed to evaluate the osteogenic potential of 3mol% yttria-stabilized tetragonal zirconia polycrystals (3Y-TZP) and niobium oxide containing Y-TZPs with specific ratios, new (Y,Nb)-TZPs, namely YN4533 and YN4533/Al20 discs.
MATERIALS AND METHODS
3Y-TZP, YN4533 and YN4533/Al20 discs (15 mm diameter and 1 mm thickness) were prepared and their average surface roughness (Ra) and surface topography were analyzed using 3-D confocal laser microscope (CLSM) and scanning electron microscope (SEM). Mouse pre-osteoblast MC3T3-E1 cells were seeded onto all zirconia discs and evaluated with regard to cell attachment and morphology by (CLSM), cell proliferation by PicoGreen assay, and cell differentiation by Reverse-Transcription PCR and Quantitative Real-Time PCR, and alkaline phosphatase (Alp) staining.
RESULTS
The cellular morphology of MC3T3-E1 pre-osteoblasts was more stretched on a smooth surface than on a rough surface, regardless of the material. Cellular proliferation was higher on smooth surfaces, but there were no significant differences between 3Y-TZP, YN4533, and YN4533/Al20. Osteoblast differentiation patterns on YN4533 and YN4533/Al20 were similar to or slightly higher than seen in 3Y-TZP. Although there were no significant differences in bone marker gene expression (alkaline phosphatase and osteocalcin), Alp staining indicated better osteoblast differentiation on YN4533 and YN4533/Al20 compared to 3Y-TZP.
CONCLUSION
Based on these results, niobium oxide containing Y-TZPs have comparable osteogenic potential to 3Y-TZP and are expected to be suitable alternative ceramics dental implant materials to titanium for aesthetically important areas.

Keyword

Dental implant; Niobium; Zirconia; Low temperature degradation (LTD); Osteogenic potential

MeSH Terms

Alkaline Phosphatase
Animals
Cell Differentiation
Cell Proliferation
Ceramics*
Dental Implants
Gene Expression
Mice
Niobium*
Osteoblasts
Polymerase Chain Reaction
Real-Time Polymerase Chain Reaction
Titanium
Alkaline Phosphatase
Dental Implants
Niobium
Titanium

Figure

  • Fig. 1 Three-dimensional confocal laser scanning microscopy (3D-CLSM) images show the roughness Ra values of zirconia discs (A) 3Y-TZP-M, (B) 3Y-TZP-R, (C) YN4533-M, (D) YN4533-R, (E) YN4533/Al20-M, (F) YN4533/Al20-R.

  • Fig. 2 Scanning electron microscopy (SEM) images of zirconia discs (A) 3Y-TZP-M, (B) 3Y-TZP-R, (C) YN4533-M, (D) YN4533-R, (E) YN4533/Al20-M, (F) YN4533/Al20-R. ×3000 magnification.

  • Fig. 3 Microscope observation 24 h after MC3T3-E1 cells were seeded onto the zirconia discs (A) 3Y-TZP-M, (B) 3Y-TZP-R, (C) YN4533-M, (D) YN4533-R, (E) YN4533/Al20-M, (F) YN4533/Al20-R. Original magnification is ×200 and the scale bar is 100 µm.

  • Fig. 4 Cellular proliferation (PicoGreen assay) of MC3T3-E1 on the zirconia discs at days 1, 4, and 7. Data are expressed as the mean ± standard deviation (SD) of three independent experiments. Significant differences (*) were denoted by Tukey and two-way analysis of variance (ANOVA) tests at P < .05.

  • Fig. 5 Real-time PCR analysis of MC3T3-E1 cells on the zirconia discs after 5, 8, and 11 days of culture in osteogenic medium for both (A) Alkaline phosphatase (Alp) and (B) Osteocalcin (Oc). Data are expressed as the mean ± standard deviation (SD) of three independent experiments. Significant differences (*) were evaluated using Tukey and two-way analysis of variance (ANOVA) tests at P < .05.

  • Fig. 6 Alp staining 10 days after cells were seeded on the zirconia discs and cultured in osteogenic medium.


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