Abstract:
Objective: to asses the influence of dental bleaching on the susceptibility of developing carieslike lesions. Methods and materials: enamel slabs obtained from recently extracted human third molars were submitted to different bleaching techniques: at home with 10% and 16% carbamide peroxide ( G1and g2 respectively, Whiteness perfect) ; and in office with 375 carbamide peroxide ( G3; Whiteness super) and 35% Hydrogen peroxide (G4; Whiteness HP)activated by light emitting diode and laser. The control groups G5 and G6 were not bleached. Afterward all specimens with the exception of G6 were exposed to high cariogenic challenge by means of Ph cycling. G6 served as the control for the artificial caries development methodology. Assessment of the enamel carieslike lesions were made visually by 3 independent examiners who attributed scores representing the severity of white spot lesions (0 to 3). Statistical analysis were performed with the Kruskal Wallis(p=o,001) and multiple paired comparison tests. Results: interrated reliability was expressed in a range of 0,70 to 0,82 kappa values. The median scores per group were as follows: G1 and G2; 1; G3, G4 and G5 2; and G6. Conclusion: home bleaching reduced the susceptibility to dental caries, while the office bleaching did not influence the development of caries lesions.

Reference:
Alves EA, Alves FKA, campos EJ, Mathias P. Susceptibility to caries like lesions after dental bleaching with different techniques. Quintessence Int 2007;38(614):404-409