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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Dental Enamel Irradiated with Infrared Diode Laser and Photo-Absorbing Cream: Part 2-EDX Study

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Author(s):
de Sant'Anna, Giselle Rodrigues [1, 2, 3] ; Pereira dos Santos, Edson Aparecido [1] ; Silva Soares, Luis Eduardo [1, 4] ; do Espirito Santo, Ana Maria [1] ; Martin, Airton Abrahao [1] ; Duarte, Danilo Antonio [2] ; Pacheco-Soares, Cristina [5] ; Brugnera, Jr., Aldo [6]
Total Authors: 8
Affiliation:
[1] Vale do Paraiba Univ, UNIVAP, Inst Res & Dev, IP&D, Lab Biomed Vibrat Spect, LEVB, Sao Paulo - Brazil
[2] Cruzeiro do Sul Univ, UNICSUL, Sao Paulo - Brazil
[3] Dent Laser Ctr, Sao Paulo - Brazil
[4] Fac Hlth Sci FCS, Dent Mat Dept, Sao Paulo - Brazil
[5] Vale do Paraiba Univ, UNIVAP, Inst Res & Dev, IP&D, Cell & Tissue Lab, Sao Paulo - Brazil
[6] Vale do Paraiba Univ, UNIVAP, Inst Res & Dev, IP&D, Dent Laser Ctr, Sao Paulo - Brazil
Total Affiliations: 6
Document type: Journal article
Source: Photomedicine and Laser Surgery; v. 27, n. 5, p. 771-782, OCT 2009.
Web of Science Citations: 10
Abstract

Objective: The effects of laser-induced compositional changes on the enamel were investigated by energy-dispersive X-ray fluorescence spectrometry (mu-EDX). After cariogenic challenge, we administered treatment of low-level infrared diode laser and a photo-absorbing cream (used to intensify the superficial light absorption). Background Data: Dental caries is considered the most prevalent oral disease. A simple and noninvasive caries preventive regimen is treating tooth enamel with a laser, either alone or in combination with fluoride, which reduces enamel solubility and dissolution rates. High power lasers are still not widely used in private practice. Low-power near-infrared lasers may be an alternative approach. Energy-dispersive mu-EDX is a versatile and nondestructive spectroscopic technique that allows for a qualitative and quantitative elemental analysis of inorganic enamel components, such as calcium and phosphorus. Materials and Methods: Twenty-four extracted or exfoliated caries-free deciduous molars were divided into six groups: 1) control group (CTR-no treatment); 2) infrared laser treatment (L) (lambda = 810 nm, 100 mW/cm(2), 90 sec, 4.47 J/cm(2), 9 J); 3) infrared laser irradiation and photo-absorbing agent (CL); 4) photo-absorbing agent alone (C); 5) infrared laser irradiation and fluoridated photo-absorbing agent (FCL); and 6) fluoridated photo-absorbing agent alone (FC). Samples were analyzed using mu-EDX after two sets of treatments and pH cycling cariogenic challenges. Results: The CL group showed statistically significant increases in calcium and phosphorus (wt%) compared with the CTR group. The Ca/P ratio was similar in the FCL and CTR groups. There was a significant laser-induced reduction compared with the CTR group, and there was a possible modification of the organic balance content in enamel treated with laser and cream. Conclusion: mu-EDX may be able to detect compositional changes in mineral phases of lased enamel under cariogenic challenge. Our results suggest that with a combined laser and photo-absorbing agent (CL) treatment, there was a possible disorganization of organic content in the tooth enamel with hydroxyapatite crystal reordering and reorganization. (AU)