Effect of different placement techniques on color stability and surface roughness of resin composites

Efeito das técnicas de inserção e alisamento na estabilidade de cor e rugosidade superficial de resinas compostas

Abstract

Introduction

Longevity and clinical success of dental restorations can be influenced by many factors during the restorative procedures.

Objective

This study aimed to evaluate the influence of different placement techniques on color stability and surface roughness of two resin composites.

Material and method

The groups of specimens (n=10) were divided according to resin composite (Filtek^TM Z250 XT and Filtek^TM Z350 XT) and placement technique: Mylar strip, spatula, dry brush, modeling liquid, and surface sealant. Color stability and surface roughness were accessed using a spectrophotometer (CIELab color space) and a rugosimeter (standard cutoff of 0.8 mm), respectively, after water storage. Subsequently, the specimens were immersed in coffee for 48 h and final color was measured. The data were analyzed using ANOVA and the Tukey’s post hoc test (α=5%) and the correlation between surface roughness (R_a) and color change (∆E_ab) was assessed using the Pearson’s correlation coefficient.

Result

The different placement techniques influenced R_a and ∆E_ab on both resin composites. The groups treated with surface sealant showed greater difference in ∆E_ab for both resin composites. The Filtek^TM Z250 XT resin showed greater color stability compared with the Filtek^TM Z350 XT resin regardless of the placement technique used. R_a of each placement technique was similar among the resin composites except for the Filtek^TM Z350 XT modeling liquid group, which presented lower R_a values compared with those of Filtek^TM Z250 XT. A correlation between R_a and staining was identified (p=0.268).

Conclusion

Color stability and R_a are influenced by different placement techniques.

Descriptors:
Dental materials; dental esthetic; staining