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Zirconia implants with improved attachment to the gingival tissue
Khalil Shahramian1,2, Michael Gasik3, Ilkka Kangasniemi2
1Department of Prosthetic Dentistry and Stomatognathic Physiology, Institute of Dentistry, University of Turku, Turku, Finland.
Journal of Periodontology
|December 21, 2019
Summary
Titanium dioxide (TiO2) coatings on zirconia implants significantly enhance gingival tissue attachment strength and durability. This improved adhesion is linked to enhanced deposition of laminin-332, crucial for epithelial integration with implant surfaces.
Area of Science:
- Biomaterials Science
- Dental Implantology
- Tissue Engineering
Background:
- Gingival tissue attachment is critical for the long-term success and prognosis of dental implants.
- Understanding factors influencing this attachment is essential for improving implant design and patient outcomes.
Purpose of the Study:
- To evaluate and compare the gingival tissue attachment to standard zirconia implants versus zirconia implants modified with sol-gel derived titanium dioxide (TiO2) coatings.
- To investigate the mechanical properties and histological characteristics of gingival attachment to these different implant surfaces.
Main Methods:
- Zirconia endodontic posts (serving as implants) were embedded in porcine gingival explants.
- Tissue-implant specimens were cultured in vitro and subjected to dynamic mechanical analysis (DMA) to simulate mastication.
- Immunohistochemical staining was performed to identify laminin gamma2 (Lnγ2) chain, a key component of laminin-332.
Main Results:
- TiO2-coated zirconia implants exhibited superior tissue attachment, demonstrated by higher dynamic modulus of elasticity and creep modulus.
- These findings indicate enhanced strength and resistance to functional damage over time for the coated implants.
- Laminin γ2 was successfully identified in the epithelial attachment zone of the TiO2-coated zirconia specimens.
Conclusions:
- Dynamic mechanical analysis and histological findings consistently show stronger gingival tissue attachment to sol-gel derived TiO2-coated zirconia compared to uncoated zirconia.
- The TiO2 coating appears to promote the synthesis and deposition of laminin-332, facilitating better epithelial integration with the implant surface.
