THE DIFFERENCE IN COLOR CHANGE OF PREHEATED AND NON-PREHEATED NANOFILLER COMPOSITE RESIN AFTER IMMERSION IN NON-INSTANT AND INSTANT COFFEE

Background: One of the aesthetic issues in using composite resin is color change. This study aimed to compare changes preheated and non-preheated nanofiller soaked non-instant coffee instant coffee. Method: involved 24 round resins with a diameter 12 mm thickness 2 mm. The samples were divided into two groups (n=12); group I was prepared at 68°C II room temperature. After curing, immersed distilled water 37°C for hours before being measured UV-vis spectrophotometer. Each sub-groups (n=6), one other three days, final measured. data analyzed independent t-tests significance level α =0.05. Result: Two revealed significant difference between (p<0.05), as well (p<0.05). Conclusion: preheating effective improve stability after immersion