title: FT-Raman spectroscopic characterization of enamel surfaces irradiated with Nd:YAG and Er:YAG lasers.
abstract: Background.Despite recent advances in dental caries prevention, caries is common and remains a serious health problem. Laser irradiation is one of the most common methods in preventive measures in recent years. Raman spectroscopy technique is utilized to study the microcrystalline structure of dental enamel. In this study, FT-Raman spectroscopy was used to evaluate chemical changes in enamel structure irradiated with Nd:YAG and Er:YAG lasers.Methods.We used 15 freshly-extracted, non-carious, human molars that were treated as follows: No treatment was carried out in group A (control group); Group B was irradiated with Er:YAG laser for 10 seconds under air and water spray; and Group C was irradiated with Nd:YAG laser for 10 seconds under air and water spray. After treatment, the samples were analyzed by FT-Raman spectroscopy.Results.The carbonate content evaluation with regard to the integrated area under the curve (1065/960 cm-1) exhibited a significant reduction in its ratio in groups B and C. The organic content (2935/960 cm-1) area exhibited a significant decrease after laser irradiation in group B and C.Conclusion.The results showed that the mineral and organic matrices of enamel structure were affected by laser irradiation; therefore, it might be a suitable method for caries prevention.
authors.affiliation: Laser Research Center of Dentistry (LRCD), Tehran University of Medical Sciences, Tehran, Iran; Departmet of Biomaterials, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Sima
authors.initials: S
authors.lastname: Shahabi
authors.affiliation: Laser Research Center of Dentistry (LRCD), Tehran University of Medical Sciences, Tehran, Iran; Laser Research Center in Medical Sciences (LRCMS), AJA University of Medical Sciences, Tehran, Iran.
authors.forename: Reza
authors.initials: R
authors.lastname: Fekrazad
authors.affiliation: Laser Research Center of Dentistry (LRCD), Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Maryam
authors.initials: M
authors.lastname: Johari
authors.affiliation: Laser Research Center of Dentistry (LRCD), Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Nasim
authors.initials: N
authors.lastname: Chiniforoush
authors.affiliation: Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: Yashar
authors.initials: Y
authors.lastname: Rezaei
keywords: Dental caries; Er:YAG lasers; Nd:YAG lasers; Raman spectroscopy