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Structural changes in dentin induced by high energy, continuous wave carbon dioxide laser
S Shariati1, M A Pogrel, G W Marshall
1Department of Oral Surgery, University of California, San Francisco 94143-0440.
Lasers in Surgery and Medicine
|January 1, 1993
Summary
Continuous wave carbon dioxide laser irradiation of dentin causes charring, melting, and surface alterations. This laser treatment can partially seal dentin tubules, potentially impacting its properties.
Area of Science:
- Dental materials science
- Laser-tissue interactions
- Biomaterials engineering
Background:
- Dental caries and dentin hypersensitivity remain significant clinical challenges.
- Minimally invasive treatments are increasingly sought after in dentistry.
- Laser technology offers potential for novel dental applications.
Purpose of the Study:
- To investigate the effects of continuous wave carbon dioxide laser parameters on dentin surface morphology.
- To evaluate the potential of laser treatment for modifying dentin structure and tubule patency.
Main Methods:
- Dentin specimens were irradiated using a continuous wave carbon dioxide laser.
- Varying power densities and exposure times were applied.
- Surface changes were analyzed using a wet scanning electron microscope.
Main Results:
- All tested conditions resulted in visible charring of the dentin surface.
- Surface cratering, flaking, and melting of dentin were observed.
- Melting led to a porous layer and partial sealing of dentin tubules.
- An underlying altered dentin zone showed tubules filled with solidified melted material.
Conclusions:
- Continuous wave carbon dioxide laser irradiation significantly alters dentin surface structure.
- The laser treatment induces melting and resolidification, potentially occluding dentin tubules.
- Further research is warranted to explore the clinical implications of these findings for dentin treatment.