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Lasers Surg Med. 2005 Dec;37(5):366-72.

Effect of Er:YAG laser on enamel acid resistance: morphological and atomic spectrometry analysis.

Author information

1
Department of Restorative Dentistry, School of Dentistry, University of São Paulo (USP), São Paulo, SP, 05508-900, Brazil.

Abstract

BACKGROUND AND OBJECTIVES:

This study evaluated the effect of Er:YAG laser on enamel acid resistance.

STUDY DESIGN/MATERIALS AND METHODS:

Seventy human enamel slabs were randomly divided into seven groups (n = 10): G1, Er:YAG laser (Key Laser 2, KaVo, Germany) 60 mJ, 2 Hz, 33.3 J/cm2 (handpiece no. 2051, non-contact); G2, Er:YAG laser 80 mJ, 2 Hz, 44.4 J/cm2 (handpiece no. 2051, non-contact); G3, Er:YAG laser 120 mJ, 2 Hz, 66.6 J/cm2 (handpiece no. 2051, non-contact); G4, Er:YAG laser 64 mJ, 2 Hz, 20 J/cm2 (handpiece no. 2055, contact); G5, Er:YAG laser 86.4 mJ, 2 Hz, 26.9 J/cm2 (handpiece no. 2055, contact); G6, Er:YAG laser 135 mJ, 2 Hz, 42.2 J/cm2 (handpiece no. 2055, contact); G7, control. After laser irradiation, samples were submitted to an acid challenge. For both the nos. 2051 and 2055 handpieces, irradiation was performed with a water cooled spray (5.0 ml/minutes). The calcium and phosphorous ions delivered from the tooth surface were quantified by atomic emission spectrometry, and morphological analysis of the enamel surface was performed under scanning electron microscopy. Kruskal-Wallis and multiple comparisons tests were applied to distinguish significant differences among the treatments (alpha = 5%).

RESULTS:

Groups G1, G2, and G4 presented decreased demineralization. The SEM evaluation revealed different surface alterations as a result of the different energies used.

CONCLUSION:

Lower energies can decrease enamel solubility without severe alterations of the enamel.

PMID:
16240417
DOI:
10.1002/lsm.20247
[Indexed for MEDLINE]

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