title: XPS analysis of the dentin irradiated by Er: YAG laser.
abstract: The aim of this study was to investigate the effect of Er:YAG laser irradiation on human dentin surface using X-ray photoelectron spectroscopy (XPS). 10 human dentin disks were prepared from extracted human molars for XPS analysis. These specimens were divided into two groups of five: a control group and group that were irradiated by an Er:YAG laser beam (100 mJ, 1Hz). All specimens were analyzed by XPS over a wide scanning range and narrow scanning ranges. The Ca/P ratio was calculated from the XPS results. In the results, the binding energies of Ca, P, and N in the laser-irradiated group were higher than those in the control group. The Ca/P ratio of the Er:YAG laser irradiated group (1.24+/-0.05) was significantly lower than that of the control group (1.52+/-0.16). This study showed that Er:YAG laser irradiation decreased Ca/P ratio and denatured the collagen of human dentin.
authors.affiliation: Department of Operative Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan. naema.dds@kpb.biglobe.ne.jp
authors.forename: Masanori
authors.initials: M
authors.lastname: Omae
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Shinnou
authors.forename: Kumiko
authors.initials: K
authors.lastname: Tanaka
authors.forename: Tomoko
authors.initials: T
authors.lastname: Abo
authors.forename: Takashi
authors.initials: T
authors.lastname: Nakata
authors.forename: Koichiro
authors.initials: K
authors.lastname: Suzuki
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Hatsuoka
authors.forename: Naohiro
authors.initials: N
authors.lastname: Iwata
authors.forename: Kazushi
authors.initials: K
authors.lastname: Yoshikawa
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Nishitani
authors.forename: Kazuyo
authors.initials: K
authors.lastname: Yamamoto
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yoshiyama
mesh_terms: D002118:Calcium / Q000032:analysis / Q000737:chemistry; D003094:Collagen / Q000737:chemistry / Q000528:radiation effects; D001840:Dental Bonding; D003804:Dentin / Q000737:chemistry / Q000528:radiation effects*; D006801:Humans; D053844:Lasers, Solid-State / Q000009:adverse effects*; D009584:Nitrogen / Q000032:analysis; D010758:Phosphorus / Q000032:analysis; D056951:Photoelectron Spectroscopy; D011489:Protein Denaturation; D013499:Surface Properties
chemical_list: D010758:Phosphorus; D003094:Collagen; D009584:Nitrogen; D002118:Calcium