Appearance Differences Between Lots and Brands of Similar Shade Designations of Dental Composite Resins.
OBJECTIVE
The purposes of this study were to investigate differences in two inherent appearance characteristics between lots of an enamel dental composite resin of the same shade and brand, and to further compare these differences to those of similar shade designation of a different brand of dental composite resins.


METHODS
Appearance analyses proceeded for three different lots of shades A1, B2, and D3 manufactured by one company and for one lot of shade EA1 manufactured by another. Samples were measured on black, white, and gray backings using spectroradiometry. Kubelka-Munk theory was used to determine reflectivity of each lot studied. CIELAB values and color differences between shades and lots were analyzed. Translucency indicators were compared between lots over thicknesses from 0.5 to 3.0 mm.


RESULTS
Differences in inherent color between some lots of same shade designations within a brand were found to be above the acceptability threshold. Color difference between an enamel composite resin of shade A1 and a composite resin of shade EA1 was also above the acceptability threshold. Statistically significant differences in the translucency were found between some lots of one shade over the entire range of thicknesses studied.


CONCLUSIONS
Appearance analyses indicate substantial variation between lots of same shade designations as well as between brands of similar shade designations.


CONCLUSIONS
Optical principles applied to important clinical appearance attributes are described which characterize inherent appearance attributes and provide aid in the appearance matching process for dental composite resins used in restorative and operative dental procedures. (J Esthet Restor Dent 29:E6-E14, 2017).
Assistant Professor, Practice, Division of General Practice and Materials Science, The Ohio State University College of Dentistry, Columbus, OH, USA.
Melody N
MN
Carney
Professor Emeritus, Division of General Practice and Materials Science, The Ohio State University College of Dentistry, Columbus, OH, USA.
William M
http://orcid.org/0000-0002-4977-6569
WM
Johnston
D000180:Acrylic Resins; D003116:Color; D003188:Composite Resins; D003743:Dental Enamel; D011140:Polyurethanes
D000180:Acrylic Resins; C029012:Composite Dental Resin; D003188:Composite Resins; D011140:Polyurethanes