Effects of air-polishing powders on color stability of composite resins

Objectives: the purpose of this study was to investigate the effect of different air-polishing powders on the color stability of different types of composite resin restorative materials. material and methods: thirty cylindrical specimens (15 × 2 mm) were prepared for each of 7 composite resin restorative materials. all specimens were polished with a series of aluminum oxide polishing discs (sof-lex). the prepared specimens of each composite resin were randomly divided into 3 groups of 10 specimens each,for control (group-c) and two air-powder applications (group-cp: cavitron prophy-jet; group-ps: sirona prosmile prophylaxis powder). a standard air-polishing unit (prosmile handly) was used. all specimens were air-powdered for 10 s at 4-bar pressure. the distance of the spray nosel from the specimens was approximately 10 mm and angulation of the nosel was 90°. specimens were stored in 100 ml of coffee (nescafe classic) for 24 h at 37°c. color measurement of all specimens was recorded before and after exposure to staining agent with a colorimeter (minolta cr-300). color differences (δez.ast;) between the 2 color measurements (baseline and after 24 h storage) were calculated. the data were analyzed with a 2-way anova test,and mean values were compared by the tukey hsd test (p≤0.05). results: according to the 2-way anova results,composite resin restorative materials,air-polishing powders,and their interaction were statistically significant (p<0.05) for aelite aesthetic enemal,filtek z250,grandio,ceramx mono,and quixfil composite resin restorative materials,no significant difference was observed between group-ps and group-cp (p>.05) and these groups demonstrated the highest δez.ast; values. for filtek silorane and intens,the highest δe z.ast; values were observed in group-ps. the lowest δe z.ast; values for all composite resin groups were observed in group-c. when comparing the 7 composite resin restorative materials,aelite aesthetic enemal demonstrated significantly less δe z.ast; values than the other composite resins tested. the highest δe z.ast; values were observed in quixfil. conclusion: except for quixfil,all control groups of composite resins that were polished sof-lex exhibited clinically acceptable δe values (<3.7). air-polishing applications increased the color change for all composite resin restorative materials tested. composite restorations may require re-polishing after air-polishing.