Effect of Preheating on the Color Stability of a Giomer Composite Immersed in Different Beverages – An In-vitro Study

Abstract

Background

Composite resins are among the most commonly used materials for aesthetic dental restorations due to their ability to closely resemble natural teeth. However, achieving long-term color stability remains a persistent challenge. Various measures has been taken recently to improve the color stability of composites. This study aims to investigate the impact of preheating a giomer composite resin on its color stability after exposure to different beverages.

Material and Method : 60 composite disks were prepared. The samples were divided into two groups: one prepared at room temperature and the other at 68 °C. After curing, all samples were immersed in distilled water at 37 °C for 24 hours. The initial color (t0) of the samples was measured using a spectrophotometer following the CIE-Lab* system. Each group was then subdivided into three subgroups, which were immersed in distilled water, coffee, or tea for 30 days. Subsequently, the final color (t1) was measured. Statistical analysis was conducted using ANOVA followed by Tukey’s post hoc tests.

Results: The preheated composites exhibited significantly less staining in the coffee solution compared to the room-temperature composites. However, in the tea solution, the preheated composites displayed greater staining than those at room temperature.

Conclusion: The findings of this study revealed that preheating composite resin is effective in reducing color changes after immersion in a coffee solution.

Keywords: color stability, composite, preheating, Beautifil II