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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.)

Selective removal of carious lesion with Er:YAG laser followed by dentin biomodification with chitosan

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Author(s):
Curylofo-Zotti, Fabiana A. ; Tanta, Gabriela Solano ; Zucoloto, Miriane Lucindo ; Souza-Gabriel, Aline E. ; Corona, Silmara A. M.
Total Authors: 5
Document type: Journal article
Source: Lasers in Medical Science; v. 32, n. 7, p. 1595-1603, SEP 2017.
Web of Science Citations: 5
Abstract

The aim of this study was to evaluate the effect of Er:YAG laser for selective removal of carious lesion, followed by biomodification with chitosan gel where the subsurface microhardness, chemical composition, and morphological changes of the residual caries-affected dentin were examined. Artificial dentinal lesions were created by pH-cycling method (14 days) in 104 bovine specimens (5 x 5 mm). Specimens were randomly divided according to the carious removal method: bur (low-speed handpiece) or Er:YAG laser (250 mJ/4 Hz). Specimens were treated with 35% phosphoric acid and were subdivided into two groups according to dentin biomodification: without chitosan (control) and 2.5% chitosan. Forty specimens were restored with an adhesive system and composite resin. Subsurface microhardness tests were performed in sound dentin, caries-affected dentin, residual caries-affected dentin, and after the restoration. The other 64 specimens were subjected to SEM-EDS atomic analysis. Data were statistically analyzed (p < 0.05). After the Er:YAG laser excavation, the microhardness value of residual caries-affected dentin was higher (p < 0.05) than bur-treated dentin. A significant decrease in the amount of Ca, P, and Ca/P ratio was found after the removal of carious lesions with Er:YAG laser (p < 0.05). The biomodification with chitosan did not influence the microhardness and atomic percentage of Ca, P, and Ca/P ratio of residual caries-affected dentin (p > 0.05). SEM analysis showed morphological changes on residual caries-affected dentin (p > 0.05). The selective removal of carious dentin with Er:YAG laser increased microhardness of residual caries-affected dentin, changing its surface morphology and chemical composition. The biomodification with chitosan did not influence the structural and chemical composition of residual caries-affected dentin. (AU)

FAPESP's process: 14/23654-9 - Selective caries removal using Er:YAG laser and rewetting dentin with chitosan solution
Grantee:Fabiana Almeida Curylofo Zotti
Support Opportunities: Scholarships in Brazil - Doctorate