Airpolishing effect on bovine enamel and the posterior remineralizing effect of saliva. An in vitro study.
OBJECTIVE
The aim of the present study was to evaluate the alterations of surface microhardness and wear caused by the sodium bicarbonate jet on bovine enamel and the further remineralizing effect of artificial saliva.


METHODS
Fifteen enamel samples (4,0mm x 4,0mm) were used, which constituted the groups: no treatment (MI); treatment with sodium bicarbonate jet (MII and DI); treatment with sodium bicarbonate jet and immersion in saliva for one hour (MIII and DII), 24 hours (MIV and DIII) and 7 days (MV and DIV). Microhardness tests were carried out using a microdurometer in groups M and wear tests by a rugosimeter in groups D. The data were assessed by the one criterion variance analysis and Tukey test.


RESULTS
The mean value of microhardness, in KHN, in groups MI, MII, MIII, MIV and MV were 359,80; 335,46; 369,20; 377,73 and 341,86, respectively, whereas the mean values in microm, of wear for group DI, DII, DIII and DIV were 0,564; 0,519; 0,441 and 0,428, respectively.


CONCLUSIONS
The sodium bicarbonate jet caused a wear and a reduction in microhardness on the enamel surface; saliva promoted the recovery of initial condition surface microhardness and reduced the wear; the repairing effect of saliva on the surface microhardness alterations occurred within one hour of treatment, having no significant statistical difference from the effect obtained in 24 hours; the best saliva repairing effect on the wear occurred with treatment of 24 hours.
Ribeiro
Helena Zaramella Vono
HZ
Department of Pediatric Dentistry, Bauru School of Dentistry, University of Sao Paulo. helenavono@hotmail.com
Lima
José Eduardo de Oliveira
JE
Vono
Bernardo Gonzalez
BG
Machado
Maria Aparcida de Andrade Moreira
MA
da Silva
Salete Moura Bonifácio
SM