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Dentin evaluation after Nd:YAG laser irradiation using short and long pulses
Eduardo H Moriyama1, Renato A Zângaro, Antonio Balbin Villaverde
1Instituto de Pesquisa e Desenvolvimento, Universidade do Vale do Paraíba, São José dos Campos, SP, Brazil.
Journal of Clinical Laser Medicine & Surgery
|May 1, 2004
Summary
Nd:YAG laser irradiation melts dentin surfaces, reducing permeability. Longer laser pulse durations create more melted substrate with increased inorganic content, enhancing dentin surface properties for dental applications.
Area of Science:
- Biomaterials Science
- Dental Laser Applications
- Surface Chemistry
Background:
- Nd:YAG laser irradiation effectively reduces dentin permeability by inducing surface melting.
- Understanding laser-hard tissue interactions is crucial for optimizing dental procedures.
- Comparative studies on pulse durations can provide valuable insights into surface modification.
Purpose of the Study:
- To evaluate morphological and chemical changes on human dentin surfaces after Nd:YAG laser irradiation.
- To investigate the effect of varying pulse durations and pulse numbers on dentin surface melting and tubule occlusion.
- To analyze the elemental composition of the melted dentin layer.
Main Methods:
- Human dentin samples were irradiated with a Nd:YAG laser (1064 nm) using 1, 2, 3, and 6 pulses with varying durations.
- Scanning Electron Microscopy (SEM) was used for morphological analysis of the irradiated surfaces.
- Energy-Dispersive Spectrometry (EDS) was employed to determine calcium and phosphorus concentrations.
Main Results:
- SEM revealed morphological changes on the dentin surface, influenced by laser pulse duration.
- EDS analysis indicated an increased concentration of calcium and phosphorus in the melted layer.
- No significant correlation was found between the number of pulses or pulse duration and the elemental concentration changes.
Conclusions:
- Longer laser interaction times led to more pronounced surface melting compared to shorter pulses.
- The melted dentin layer exhibited a higher concentration of inorganic substances than non-irradiated dentin.
- Nd:YAG laser irradiation shows potential for modifying dentin surface properties, with pulse duration influencing the extent of melting.