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Characterisation of dentin surfaces processed with KrF excimer laser radiation
Sónia Eugénio1, Manickam Sivakumar, Rui Vilar
1Departamento de Engenharia de Materiais, Instituto Superior Técnico, 1049-001 Lisboa, Portugal.
Biomaterials
|June 14, 2005
Summary
Laser processing of human dentin with a KrF excimer laser creates distinct surface changes. Dentin
Area of Science:
- Biomaterials Science
- Dental Materials
- Laser-Ablation Physics
Background:
- Understanding laser-tissue interactions is crucial for dental applications.
- Dentin's complex composition influences its response to laser irradiation.
- Optimizing laser parameters is key to achieving desired surface modifications.
Purpose of the Study:
- To investigate the effects of KrF excimer laser radiation on human dentin surface microtexture and chemistry.
- To analyze the influence of varying laser fluences (0.5–20 J/cm²) on dentin.
- To correlate observed surface changes with dentin's intrinsic properties.
Main Methods:
- Scanning Electron Microscopy (SEM) for surface topography analysis.
- X-ray Photoelectron Spectroscopy (XPS) for chemical composition assessment.
- Fourier-Transform Infrared Spectroscopy (FTIR) for molecular structure changes.
Main Results:
- Two distinct surface topographies were observed: a flat surface with occluded apertures and a fluence-dependent columnar structure.
- Low fluences (<1 J/cm²) resulted in preferential intertubular dentin removal, forming columnar structures.
- Higher fluences (>1 J/cm²) produced a flat surface with resolidified material; chemical changes were minimal.
Conclusions:
- Laser processing of dentin can lead to varied surface morphologies based on fluence.
- Dentin's inherent composition dictates its response to KrF excimer laser treatment.
- The laser treatment, within the studied fluences, did not significantly alter dentin's bulk chemical properties.