Effect of iron on acid demineralisation of bovine enamel blocks by a soft drink.
OBJECTIVE
The aim of this study was to evaluate, in vitro, the effect of iron on the acid demineralisation of bovine enamel blocks by a soft drink.


METHODS
Twenty-four blocks of bovine enamel were randomly assigned to two groups (experimental and control), which were exposed to 4 cycles of demineralisation in Coke containing or not 10 mmol/L of iron, respectively, and another 4 cycles of remineralisation in artificial saliva. The softening of enamel was evaluated by % superficial microhardness change (SMHC) and wear analysis. Data were analysed using t-test (p<0.05).


RESULTS
With regard to %SMHC, the experimental group presented average values (+/-S.E.) of -85.3+/-0.9, that were significantly higher (t=4.7, p<0.01) than the ones observed for control group (-76.7+/-1.6). The experimental group presented a mean wear (+/-S.E.) of 2.3+/-0.2 microm, that was significantly lesser (t=3.7, p<0.01) than the one observed for the control group (3.5+/-0.2 microm).


CONCLUSIONS
According to this protocol, iron at 10 mmol/L significantly reduced the wear, but significantly enhanced the %SMHC of enamel blocks submitted to erosion by Coke.
Kato
Melissa Thiemi
MT
Social Dentistry Department, Bauru School of Dentistry, University of São Paulo, Bauru, Al. Octávio Pinheiro Brisolla, 9-75 Bauru, SP 17012-901, Brazil.
Sales-Peres
Sílvia Helena de Carvalho
SH
Buzalaf
Marília Afonso Rabelo
MA
D000143:Acids / Q000009:adverse effects; D000818:Animals; D002253:Carbonated Beverages / Q000009:adverse effects; D002327:Cariostatic Agents / Q000494:pharmacology*; D002417:Cattle; D003743:Dental Enamel / Q000187:drug effects*; D003747:Dental Enamel Solubility / Q000187:drug effects; D005459:Fluorides; D006244:Hardness; D007501:Iron / Q000494:pharmacology*; D023421:Models, Animal; D012464:Saliva, Artificial; D017001:Tooth Demineralization / Q000378:metabolism / Q000517:prevention & control*
D000143:Acids; D002327:Cariostatic Agents; D012464:Saliva, Artificial; D007501:Iron; D005459:Fluorides