Short and long term effects of additional post curing and polishing systems on the color change of dental nano-composites.
The purpose was to determine the short and long term effects of polishing systems and post-heat-light curing on the color stability of nano-composites. The disc shaped samples (ø=10 mm, h=3 mm) were prepared. Forty subgroups (n=5) were designed according to two different curing conditions and five different polishing methods. Color change measurements were performed on the day of specimen preparation (base) and repeated after 1 and 7 months of water storage. MANOVA and Tukey's post hoc tests were applied (p<0.05). While the color difference values of resin composites were ranked as EXP2>EXP1>CME≥XTE after 1 month (p<0.05), after 7 months the ranking was EXP2≥EXP1>XTE>CME (p<0.05). Type and compositions of nano-composites may be important on the long-term color stability of the restoration. Additional post-heat-light curing of nano-composites may produce higher color change than the hand-light curing protocol. Consequently, the polishing procedures should be applied to obtain more resistant composite surface to discoloration.
Gazi University, Faculty of Dentistry, Department of Prosthodontics, Ankara, Turkey. ferhanegilmez@gmail.com
Ferhan
F
Egilmez
Gulfem
G
Ergun
Isil
I
Cekic-Nagas
Pekka K
PK
Vallittu
Lippo V J
LV
Lassila
D000704:Analysis of Variance; D003116:Color; D003124:Colorimetry / Q000379:methods; D003188:Composite Resins / Q000737:chemistry*; D003775:Dental Polishing / Q000379:methods*; D055115:Light-Curing of Dental Adhesives; D008855:Microscopy, Electron, Scanning; D049329:Nanostructures / Q000737:chemistry*; D011176:Post and Core Technique; D013997:Time Factors
D003188:Composite Resins