ISSN (Online) : 2277-4572
Author(s): Devadiga Darshana*, Hegde N. Mithra, Gafoor Fayaz, Shetty Pushparaj
The aim of this study is to compare the effect of a new re mineralizing agent on tooth surface before and after bleaching procedure. Freshly extracted intact human premolar teeth from patients extracted for orthodontic purposes were collected. Enamel sections were prepared from surfaces of teeth using diamond cutting disc and slow speed hand piece under water cooling. Specimens were divided into 4 groups of 8 specimens each and subjected to surface treatment as follows: Group-1 (Control - Intact tooth surface), Group-2 (Bleached tooth surface), Group-3 (Re mineralization before bleaching), Group-4 (Bleaching followed by re mineralization). The re mineralizing agent used was 0.21 % Sodium fluoride- tricalcium phosphate based cream (Clinpro tooth cream, 3M ESPE) for 4 minutes. The bleaching agent used was 10 % Carbamide peroxide gel (Opalescence) for a period of 8-10 hours. Enamel Specimens were examined under scanning electron microscopy-Energy Dispersive X-ray Analysis and data obtained was statistically analyzed. A significant difference was seen in both calcium and phosphate levels of all the four groups mainly between the samples of Group 2 [bleached] and Group 4 [bleaching + re mineralization]. The de mineralizing effect of bleaching on enamel surface can be reduced by surface treatment using a re mineralizing agent as toothpaste containing Beta tricalcium phosphate. The re mineralization effect is relatively greater when the re mineralizing agent is used after the bleaching procedure rather than before the procedure
