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Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
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Two basic types of preparation are used to visualize specimens with a light microscope: wet mounts and fixed specimens.
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Photopatterning Proteins and Cells in Aqueous Environment Using TiO2 Photocatalysis
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Observation of Cells on a Simulated Titanium Surface with Transparency.

K Teraoka1, A Watazu2, T Sonoda3

  • 1National Institute of Advanced Industrial Science and Technology, Human Informatics and Interaction Research Institute, Tsukuba, Ibaraki, Japan.

Journal of Dental Research
|March 23, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed a transparent titanium thin layer to observe live cells on titanium surfaces, overcoming limitations of opaque bulk titanium. This innovation allows real-time study of cellular activity, crucial for understanding osseointegration and implant development.

Keywords:
biocompatible materialsbiomaterialscell movementdental implantsmicroscopyosseointegration

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Area of Science:

  • Biomaterials Science
  • Cell Biology
  • Surface Science

Background:

  • Osseointegration of titanium implants is vital for dental and orthopedic applications.
  • Cellular activity, specifically calcification, drives osseointegration.
  • Observing live cells on opaque titanium surfaces is challenging with standard microscopy.

Purpose of the Study:

  • To create a transparent titanium thin layer for real-time live-cell observation on simulated titanium surfaces.
  • To characterize the physical and chemical properties of the fabricated transparent titanium layer.
  • To investigate the behavior and motility of osteoblast-like cells cultured on this novel titanium surface.

Main Methods:

  • Fabrication of a transparent titanium thin layer on polystyrene culture dishes via magnetron DC sputtering.
  • Characterization of the titanium layer's transparency, composition, structure, and wettability.
  • Culturing osteoblast-like cells on the titanium-coated dishes and observing their behavior using inverted microscopy and time-lapse video recording.

Main Results:

  • The transparent titanium layer exhibited suitable transmittance, hydrophilic wettability (contact angle 67.52°), and surface composition/structure similar to bulk titanium.
  • Osteoblast-like cells adhered, proliferated, and formed confluent layers on the titanium surface.
  • Time-lapse videos revealed active cell movement, indicating the titanium surface influences cellular motility.

Conclusions:

  • The transparent titanium thin layer serves as an effective substrate for observing live cellular responses on titanium surfaces.
  • This method overcomes the optical limitations of bulk titanium, enabling new insights into cell-surface interactions.
  • The findings support the use of this transparent titanium model for studying osseointegration and developing improved titanium-based medical implants.