Surface and subsurface erosion of primary enamel by acid beverages over time.
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.
Department of Pediatric Clinic, Preventive and Community Dentistry, Ribeirão Preto Dental School, University of São Paulo, Ribeirão Preto, SP, Brazil.
Carolina Paes
CP
Torres
Michelle Alexandra
MA
Chinelatti
Jaciara Miranda
JM
Gomes-Silva
Fátima Aparecida
FA
Rizóli
Maria Angélica Hueb de Menezes
MA
Oliveira
Regina Guenka
RG
Palma-Dibb
Maria Cristina
MC
Borsatto
D000143:Acids / Q000009:adverse effects*; D001628:Beverages / Q000009:adverse effects*; D003743:Dental Enamel / Q000473:pathology* / Q000648:ultrastructure; D006244:Hardness; D006801:Humans; D006863:Hydrogen-Ion Concentration; D013997:Time Factors; D014077:Tooth Erosion / Q000209:etiology* / Q000473:pathology; D014094:Tooth, Deciduous
D000143:Acids