Evaluation of Color Change of Acrylic and Bisacrylic Resins after Immersion in Different Solutions.

Temporary restorations are of great importance for success in the course and completion of dental rehabilitations. In the face of substances transiting the oral cavity, color stability becomes essential for success during its use, mainly for the maintenance of aesthetics. The objective of the study was to evaluate the influence of the solutions of routine consumption on the color change of two materials used in the preparation of temporary restorations, comparing the stability of the acrylic resin with the bisacrylic resin. For the research, 60 samples were made, 30 of which were made of conventional acrylic resin (DencôrLay, Clássico Ind. And Com., São Paulo, SP, Brazil) and 30 of Protemp 4 bisacrylic resin (3M ESPE, St. Paul, MN) TO 1. The samples were divided into three groups (n = 10) according to the immersion medium: distilled water (control), Cola-Cola® and Coffee. The evaluation of the color change (ΔE) was evaluated according to the difference of the initital and final color (after 7 days of immersion) through the spectrophotometer (Vita Easyshade Advance 4.0; Vita-zahnfabrik). The results showed that the solutions presented significant staining potential, and that coffee provided the greatest color change for both resins tested (p <0.05). Regardless of the immersion medium, the bisacrylic resin presented the highest values of ΔE. It is concluded that coffee has a high staining potential over the provisional materials and that the bisacrylic resin has a lower color stability compared to the acrylic resin. [ABSTRACT FROM AUTHOR]