Relationship between the chemical and morphological characteristics of human dentin after Er:YAG laser irradiation

Autor(es)

Silva Soares, Luis Eduardo ^[1] ; Lavesa Martin, Ovidio Cesar ^[2] ; Moriyama, Lilian Tan ^[3] ; Kurachi, Cristina ^[3] ; Martin, Airton Abrahao ^[2]

Afiliação do(s) autor(es)

^[1] Univ Vale Paraiba, UNIVAP, Dept Dent Mat & Operat Dent, IP&D, LEVB, Sch Dent Res & Dev Inst, BR-12244000 Sao Jose Dos Campos, SP - Brazil

^[2] Univ Vale Paraiba, UNIVAP, IP&D, LEVB, BR-12244000 Sao Jose Dos Campos, SP - Brazil

^[3] Univ Sao Paulo, IFSC, Dept Fis & Ciencias Mat, FCM, BR-13566590 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Biomedical Optics; v. 18, n. 6 JUN 2013.
• Citações Web of Science: 6

Resumo

The effects of laser etching on dentin are studied by microenergy-dispersive x-ray fluorescence spectrometry (mu-EDXRF) and scanning electron microscopy (SEM) to establish the correlation of data obtained. Fifteen human third molars are prepared, baseline mu-EDXRF mappings are performed, and ten specimens are selected. Each specimen received four treatments: acid etching (control-CG) or erbium: yttrium-aluminum-garnet (Er: YAG) laser irradiation (I-100 mJ, II-160 mJ, and III-220 mJ), and maps are done again. The Ca and P content are significantly reduced after acid etching (p < 0.0001) and increased after laser irradiation with 220 mJ (Ca: p < 0.0153 and P: p = 0.0005). The Ca/P ratio increased and decreased after CG (p = 0.0052) and GI (p = 0.0003) treatments, respectively. CG treatment resulted in lower inorganic content (GI: p < 0.05, GII: p < 0.01, and GIII: p < 0.01) and higher Ca/P ratios than laser etching (GI: p < 0.001, GII: p < 0.01, and GIII: p < 0.01). The SEM photomicrographies revealed open (CG) and partially open dentin tubules (GI, GII, and GIII). mu-EDXRF mappings illustrated that acid etching created homogeneous distribution of inorganic content over dentin. Er: YAG laser etching (220 mJ) produced irregular elemental distribution and changed the stoichiometric proportions of hydroxyapatite, as showed by an increase of mineral content. Decreases and increases of mineral content in the mu-EDXRF images are correlated to holes and mounds, respectively, as found in SEM images. (C) 2013 Society of Photo-Optical Instrumentation Engineers (SPIE) (AU)

• Processo FAPESP: 05/50811-9 - Estudo do colágeno da dentina por técnicas de microanálise
• Beneficiário: Airton Abrahao Martin
• Modalidade de apoio: Auxílio à Pesquisa - Regular