Potential of 10% strawberry gel (fragaria x annanassea) as an alternative bleaching agent for extrinsic discoloration of composite resin: an in vitro study

Abstract

Objective: The aim of this study was to examine the potential of 10% strawberry gel in reducing extrinsic discoloration of composite resin. Material and Methods: This was a laboratory experimental study using 40 composite resins molded in 8-mm diameter and 2-mm thickness. Samples were soaked in coffee solution for 7 days to obtain discoloration and checked by VITAPAN classical®shade guideand adobe photoshop CS4 Version 11.0 by CIEL*a*b method. The discolored samples were randomly divided into two groups of 20 samples of each group. Group I was treated with 10% strawberry gel for 8 hours every day in 12 consecutive days and group II as control group was treated with 10% carbamide peroxide in the same way as group I. Results: The results showed a significant change of the color in each group according to Friedman test (p<0.05) while no significant color change difference of group I when compared to group II based on the results of Mann-Whitney test. Either 10% strawberry gel or 10% carbamid peroxide could not return the composite resins color into the baseline. Conclusion: 10% strawberry gel has similar potency as 10% carbamid peroxide in reducing extrinsic discoloration of composite resin.