Estimation of the surface gloss of dental nano composites as a function of color measuring geometry.
OBJECTIVE
To estimate the surface gloss of various dental nano composites by using the correlation between deltaE* specular component excluded (SCE) - specular component included (SCI) and surface roughness (Ra).


METHODS
Two brands of commercial and two experimental light-cured resin composites were used. Resin composite discs were prepared 10 mm in diameter and 3 mm in thickness. 56 subgroups (n=5) were designed according to two different curing conditions (hand light curing and additional post-heat curing) and seven different polishing methods (Mylar, 4000-, 2400-, 1200- and 320- SiC paper, rubber-based silicone, three-step polishing kit). deltaE*SCE-SCI and Ra measurements were done. Two specimens in each subgroup were analyzed by SEM. Multifactorial ANOVA and post hoc Tukey test were applied for the evaluation of the deltaE*SCE-SCI and Ra data (P<0.05). Moreover, Spearman's rank correlation test was used to determine the correlation between deltaE*SCE-SCI and Ra results (P<0.01).


RESULTS
A strong correlation was found between deltaE*(SCE-SCI) and Ra results indicating the surface gloss of the tested composite resin materials after different curing and surface polishing methods. A three-factor interaction was found between curing conditions, surface polishing methods and resin composites (P<0.05) in deltaE*SCE-SCI and Ra results. Additionally, significant differences were found between composites and between polishing methods (P<0.05). Furthermore, there were significant differences between curing conditions in Ra results (P<0.05).
Department of Prosthodontics, Gazi University, Faculty of Dentistry, 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; D017438:Bisphenol A-Glycidyl Methacrylate; D003116:Color; D003124:Colorimetry; D003188:Composite Resins / Q000138:chemical synthesis / Q000737:chemistry; D003775:Dental Polishing / Q000379:methods; D055115:Light-Curing of Dental Adhesives / Q000379:methods; D053761:Nanocomposites / Q000737:chemistry; D055620:Optical Phenomena; D011092:Polyethylene Glycols; D011109:Polymethacrylic Acids; D013053:Spectrophotometry / Q000379:methods; D018709:Statistics, Nonparametric; D013499:Surface Properties
D003188:Composite Resins; D011109:Polymethacrylic Acids; C020946:triethylene glycol dimethacrylate; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate