Color variation between composite and vita classical shade guide

Abstract

The correct replication of color and translucency of the tooth structure is one of the biggest challenges in esthetic and restorative dentistry and mistakes in tooth shade selection may lead to failures in treatment. Objective: This study aim to evaluate, through CIEL * C * h * and CIEL * a * b * color systems, the difference between color of composite and Vita Classical shade guide, using the Vita EasyShade spectrophotometer. Material and methods: Four composite (Forma, Opallis, Oppus and Vittra) shade A2 were used. The specimens (n=6) were obtained using a steel matrix (4x2mm), then hydrated for 7 days and submitted to the finishing and polishing procedures; for subsequent color measurement with spectrophotometer. The color variation was calculated by measuring both color systems values of each material and comparing them with the Vita A2 shade guide results. The statistical analysis used was one-way ANOVA / Tukey test, considering a significance level of 5% (p≤0.05). Results: All materials showed color variation when compared to the shade guide. By the analysis of L*C* h*, all materials demonstrated a color variation greater than what is considered clinically unacceptable, whereas in the analysis of L*a*b* only Vittra APS resin composite showed a clinically acceptable color variation. Conclusion: The analyzed materials showed a great variation of color and the Vita Classical shade guide might not be in accordance to composite shade.