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Related Experiment Videos

Subsurface morphologic changes of ND:YAG laser-etched enamel

J A Hess1

  • 1Department of Biomedical Sciences, University of Detroit Mercy School of Dentistry, Michigan 48207, USA.

Lasers in Surgery and Medicine
|January 1, 1997
PubMed
Summary

Nd:YAG laser etching of enamel creates subsurface microfissures up to 10 microns deep. These changes enhance mechanical retention for dental resins, improving bonding effectiveness.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Laser Dentistry

Background:

  • Nd:YAG laser etching of enamel generates surface irregularities including cavities, micropores, and microfissures.
  • Understanding subsurface alterations is crucial for optimizing dental adhesive procedures.

Purpose of the Study:

  • To investigate the pattern and depth of subsurface changes in enamel after Nd:YAG laser etching.
  • To assess the potential of laser-induced alterations for improving dental resin retention.

Main Methods:

  • Maxillary central incisor teeth were etched with a pulsed Nd:YAG laser.
  • Samples were prepared using plastic embedding and demineralization, or by splitting the teeth.
  • Scanning Electron Microscopy (SEM) was employed for detailed examination.

Main Results:

  • SEM analysis revealed a delicate interlacing pattern of thin partitions and knob-like expansions on the etched enamel surface.
  • Microfissures were observed penetrating the enamel subsurface to an estimated depth of 10 microns.

Conclusions:

  • The subsurface alterations created by Nd:YAG laser etching provide potential spaces for dental resin infiltration.
  • These microstructural changes may enhance the mechanical retention of dental resins, improving bond strength.

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