Effect of Heavy Metals Contamination from Cigarette Smoke on Sound and Caries-Like Enamel

Autor(es)

Theobaldo, Jessica D. ^[1] ; Vieira-Junior, Waldemir F. ^[1] ; Catelan, Anderson ^[1] ; Mainardi, Maria do Carmo A. ^[1] ; Ysnaga, Orlando A. ^[2] ; Rodrigues-Filho, Ubirajara P. ^[2] ; Marchi, Gise ellMaria ^[1] ; Lima, Debora A. ^[1] ; Aguiar, Flavio H. B. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Dept Restorat Dent, Piracicaba Dent Sch, Ave Limeira 901, BR-13414903 Piracicaba, SP - Brazil

^[2] Univ Sao Paulo, Dept Chem & Mat Inorgan Hybrids, Inst Chem Sao Carlos, Ave Trab Sao Carlense 400, BR-13563120 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Microscopy and Microanalysis; v. 24, n. 6, p. 762-767, DEC 2018.
• Citações Web of Science: 0

Resumo

In this study, we sought to evaluate the influence of cigarette smoke and pH cycling on the chemical composition and surface/cross-sectional enamel microhardness. A total of 40 dental blocks obtained from bovine incisors were divided into four groups (n=10): no treatment (control); exposure to cigarette smoke (CS); exposure to pH cycling (PC); and exposure to cigarette smoke and pH cycling (CS-PC). The samples were analyzed by synchrotron radiation micro X-ray fluorescence, bench mode X-ray fluorescence, as well as surface microhardness (SMH) and cross-sectional microhardness (CSMH) testing. The SMH results were submitted to analysis of variance (ANOVA) and Tukey's test. The CSMH results were evaluated using split-plot ANOVA and Tukey's test. A high amount of Cd and Pb and traces of Ni and As were observed in enamel and dentin after exposure to cigarette smoke (CS and CS-PC). The SMH and CSMH of CS were statistically higher when compared with the control. The PC and CS-PC showed lower SMH and CSMH. We conclude that exposure to cigarette smoke promoted heavy metal deposition in enamel/dentin. In addition, it increased the enamel microhardness but did not promote a protective effect on the in vitro development of caries. The clinical significance of this work is that there is significant bioaccumulation of heavy metals from cigarette smoke on the surface and in the enamel and dentin. (AU)

• Processo FAPESP: 13/15225-8 - Avaliação do efeito da fumaça de cigarro nas propriedades físicas e químicas do esmalte e dentina e na resistência de união à resina composta utilizando diferentes sistemas adesivos
• Beneficiário: Jessica Dias Theobaldo
• Modalidade de apoio: Bolsas no Brasil - Mestrado