title: Evaluation of Dental Shade Guide Variability Using Cross-Polarized Photography.
abstract: This study evaluated color variability in the A hue between the VITA Classical (VITA Zahnfabrik) shade guide and four other VITA-coded ceramic shade guides using a Canon EOS 60D camera and software (Photoshop CC, Adobe). A total of 125 photographs were taken, 5 per shade tab for each of 5 shades (A1 to A4) from the following shade guides: VITA Classical (control), IPS e.max Ceram (Ivoclar Vivadent), IPS d.SIGN (Ivoclar Vivadent), Initial ZI (GC), and Creation CC (Creation Willi Geller). Photos were processed with Adobe Photoshop CC to allow standardized evaluation of hue, chroma, and value between shade tabs. None of the VITA-coded shade tabs fully matched the VITA Classical shade tab for hue, chroma, or value. The VITA-coded shade guides evaluated herein showed an overall unmatched shade in all tabs when compared with the control, suggesting that shade selection should be made using the guide produced by the manufacturer of the ceramic intended for the final restoration.
authors: Jon
authors: J
authors: Gurrea
authors: Marta
authors: M
authors: Gurrea
authors: August
authors: A
authors: Bruguera
authors: Camila S
authors: CS
authors: Sampaio
authors: Malvin
authors: M
authors: Janal
authors: Estevam
authors: E
authors: Bonfante
authors: Paulo G
authors: PG
authors: Coelho
authors: Ronaldo
authors: R
authors: Hirata
mesh_terms: D003124:Colorimetry; D003776:Dental Porcelain / Q000737:chemistry*; D017267:Dental Prosthesis Design; D006801:Humans; D008422:Materials Testing; D055620:Optical Phenomena; D010781:Photography; D017797:Prosthesis Coloring; D012984:Software
chemical_list: D003776:Dental Porcelain