Surface and subsurface erosion of primary enamel by acid beverages over time

Brazilian Dental Journal

Carolina Paes Torres²  Michelle Alexandra Chinelatti¹  Jaciara Miranda Gomes-silva²  Fátima Aparecida Rizóli²  Maria Angélica Hueb De Menezes Oliveira¹  Regina Guenka Palma-dibb¹  Maria Cristina Borsatto² 

[1] ,University of São Paulo Ribeirão Preto Dental School Preventive and Community DentistryRibeirão Preto SP ,Brazil

关键词: primary teeth;    enamel;    erosion;    aprismatic layer;   

DOI  :  10.1590/S0103-64402010000400009

来源: SciELO

【 摘 要 】

This study evaluated the influence of a cola-type soft drink and a soy-based orange juice on the surface and subsurface erosion of primary enamel, as a function of the exposure time. Seventy-five primary incisors were divided for microhardness test (n=45) or scanning electron microscopy (SEM) analysis (n=30). The specimens were randomly assigned to 3 groups: 1 - artificial saliva (control); 2 - cola-type soft drink; and 3 - soy-based orange juice. Immersion cycles in the beverages were undertaken under agitation for 5 min, 3 times a day, during 60 days. Surface microhardness was measured at 7, 15, 30, 45 and 60 days. After 60 days, specimens were bisected and subsurface microhardness was measured at 30, 60, 90, 120, 150 and 200 µm from the surface exposed. Data were analyzed by ANOVA and Tukey’s test (a=0.05). Groups 2 and 3 presented similar decrease of surface microhardness. Regarding subsurface microhardness, group 2 presented the lowest values. SEM images revealed that after 60 days the surfaces clearly exhibited structural loss, unlike those immersed in artificial saliva. It may be concluded that erosion of the surfaces exposed to the cola-type soft drink was more accentuated and directly proportional to the exposure time.

【 授权许可】

CC BY   
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