Open AccessData Fitting to Study Ablated Hard Dental Tissues by Nanosecond Laser Irradiation
Author(s) -
Yas AlHadeethi,
S. Al-Jedani,
M. A. N. Razvi,
Abdu Saeed,
A. M. AbdelDaiem,
M. Shahnawaze Ansari,
Saeed Salem Babkair,
Numan Salah,
A. Al-Mujtaba
Publication year - 2016
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0156093
Subject(s) - materials science , enamel paint , laser , irradiation , ablation , dentin , laser ablation , spectroscopy , laser induced breakdown spectroscopy , scanning electron microscope , yttrium , nanosecond , analytical chemistry (journal) , optics , composite material , chemistry , physics , engineering , quantum mechanics , nuclear physics , metallurgy , aerospace engineering , oxide , chromatography
Laser ablation of dental hard tissues is one of the most important laser applications in dentistry. Many works have reported the interaction of laser radiations with tooth material to optimize laser parameters such as wavelength, energy density, etc. This work has focused on determining the relationship between energy density and ablation thresholds using pulsed, 5 nanosecond, neodymium-doped yttrium aluminum garnet; Nd:Y 3 Al 5 O 12 (Nd:YAG) laser at 1064 nanometer. For enamel and dentin tissues, the ablations have been performed using laser-induced breakdown spectroscopy (LIBS) technique. The ablation thresholds and relationship between energy densities and peak areas of calcium lines, which appeared in LIBS, were determined using data fitting. Furthermore, the morphological changes were studied using Scanning Electron Microscope (SEM). Moreover, the chemical stability of the tooth material after ablation has been studied using Energy-Dispersive X-Ray Spectroscopy (EDX). The differences between carbon atomic % of non-irradiated and irradiated samples were tested using statistical t-test. Results revealed that the best fitting between energy densities and peak areas of calcium lines were exponential and linear for enamel and dentin, respectively. In addition, the ablation threshold of Nd:YAG lasers in enamel was higher than that of dentin. The morphology of the surrounded ablated region of enamel showed thermal damages. For enamel, the EDX quantitative analysis showed that the atomic % of carbon increased significantly when laser energy density increased.