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Morphological evaluation of enamel and dentin irradiated with 9.6 μm CO2 and 2.94 μm Er:YAG lasers

✍ Scribed by T. M. Marraccini; L. Bachmann; H. A. Wigdor; J. T. Walsh Jr.; A. Stabholtz; D. M. Zezell

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
418 KB
Volume
2
Category
Article
ISSN
1612-2011

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✦ Synopsis

Background: The objective was to evaluate the
morphology of enamel and dentin irradiated with Er:YAG
(2.94 μm) and CO~2~ (9.6 μm) lasers. Methods: Six groups
were evaluated: G1 – CO~2~ irradiated enamel (3 W); G2 – CO~2~
irradiated dentin (3 W); G3 – CO~2~ irradiated enamel (7 W); G4
– CO~2~ irradiated dentin (7 W); G5 – Er:YAG irradiated enamel
(0.16 W); G6 – Er:YAG irradiated dentin (0.16 W). Results: The
morphological pattern of Er:YAG laser irradiated enamel and dentin
has a rough aspect with a clear exposition of the prisms and
dentinal tubules. The melted surfaces covering the CO~2~ laser
irradiated enamel and dentin, occlude the dentinal tubules and the
enamel prisms. Conclusion: The rough pattern after Er:YAG laser
irradiation, which originates from the micro-explosion of water,
does not occlude the dentinal tubules, whereas the surface
morphology after CO~2~ laser irradiation, which originated from
the temperature rise above hydroxyapatite melting point, shows
dentinal tubules occlusion and tissue melting. Clinical
implications: These changes influence the tissue properties such
as increase of the enamel acid resistance or decrease the bond
strength between the tissue and composite resin.

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