3-dimensional visualization of implant-tissue interface with the polyethylene glycol associated solvent system tissue...

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Histology

Background:

• Dental implants are crucial for restoring lost teeth, with osseointegration at the implant-tissue interface being key.
• Traditional histological methods face challenges in analyzing the mechanical properties of implant-tissue interfaces.
• Novel techniques are needed to effectively investigate these critical interfaces.

Purpose of the Study:

• To introduce and validate the polyethylene glycol (PEG)-associated solvent system (PEGASOS) tissue clearing method for analyzing dental implant interfaces.
• To investigate the processes of angiogenesis and osteogenesis at the implant-bone interface using PEGASOS.
• To compare the osseointegration potential of titanium and stainless steel implants.

Main Methods:

• Developed the PEGASOS tissue clearing method to render bone and teeth transparent while preserving internal structures and fluorescence.
• Combined PEGASOS with transgenic mouse models and advanced labeling techniques.
• Acquired high-resolution, multi-channel 3D image stacks of decalcified and non-decalcified mouse mandibles with implants.

Main Results:

• PEGASOS treatment resulted in highly transparent tissues, allowing direct visualization of implants without sectioning.
• Simultaneous imaging of implants, tissues, and fluorescent labels was achieved without interface disruption.
• Angiogenesis and osteogenesis surrounding titanium and stainless steel implants were successfully investigated and quantified.

Conclusions:

• Both titanium and stainless steel implants supported comparable levels of angiogenesis.
• Osseointegration and calcium precipitation were observed with titanium implants but not with stainless steel implants.
• The PEGASOS tissue clearing method offers a new approach for studying hard tissue-implant interfaces.