Surface morphology, elemental distribution, and spectroscopic changes subsequent the application of nanosecond pulsed Nd:YAG laser on dental enamel surface
✍ Scribed by A. Antunes; S. S. Vianna; A. S. L. Gomes; W. de Rossi; D. M. Zezell
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 276 KB
- Volume
- 2
- Category
- Article
- ISSN
- 1612-2011
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✦ Synopsis
Application and development of new methods in caries
prevention is of paramount importance to reduce the incidence of
chronic cases of the caries disease and to preserve dental
structure. In this work, we tested nanosecond pulsed Nd:YAG laser
on enamel surface examining the changes laser-induced by means
SEM, EDS, and FTIR. SEM revealed, the existence of melted zone and
bubble inclusions when 40 J/cm^2^ (τ=6 ns, 5 Hz) was
applied on human sound enamel surface. The morphological
alteration to 10 J/cm^2^ (τ=6 ns, 5 Hz) and to
20 J/cm^2^ (τ=200 ns, 7 Hz) no presented melting aspect,
but a greater number of bubble inclusions. We have indicated that
the Ca/P ratio increased to irradiation conditions employed here.
In our previous study, the combination of the laser parameters not
produce an excessive increase in temperature. The temperature
variation was less than 2.5°C in the dental pulpal,
following application of the energy density of 40 J/cm^2^. Our
results suggest that nanosecond pulsed Nd:YAG laser can be used to
obtain minimal morphological alteration associated with a
chemical reorganization enhancing the microhardness values and
consequently inhibiting the acid dissolution by bacterial agents.
In this work, the Vickers microhardness was quantified. Our
results of FTIR analysis indicated that the laser effects
occurring substantially in the organic compounds (such as water
and proteins groups) and are reduced for mineral contend (such as
phosphate and carbonate groups).