What type of study is this?

This is a In Vitro Study study.

September 22, 2025Open Access

Evaluation of color stability and surface roughness of nanohybrid resin composites with different photoinitiator systems after staining and home/office bleaching: An in vitro study

Key Points

Color stability improved significantly after bleaching in composites with photoinitiator systems, indicating effective treatment options for aesthetics.
Surface roughness was measured using profilometry; results showed varying roughness levels across different bleaching methods and materials.
Statistical analyses revealed significant differences in color change and surface roughness between the tested composites after exposure to staining and bleaching.
The study utilized in vitro methods with spectrophotometric measurements, providing reliable data on the durability and aesthetic properties of dental materials.

Abstract

Aim: This in vitro study aimed to evaluate the color stability and surface roughness of different photoinitiator systems-based nanohybrid resin composites after staining and home or office bleaching. Materials and Methods: A total of 80 resin-based composite (RBC) discs with lucirin-TPO (Tetric EvoCeram, Ivoclar Vivadent) or champhoroquinon (CQ) (Grandio, Voco) were preperad (8x2mm). At baseline, post-coffee staining (12 days/37°C), and bleaching, color values (ΔE*Lab) using spectrophotometre and surface roughness (Ra) by profilometer were measured. Hydrogen peroxide gel 35% (Whiteness HP, FGM) for office bleaching and carbamide peroxide gel 16% (Whiteness Perfect, FGM) for home bleaching were used. One sample of each groups was evaluated under scanning electron microscopy. Statistical analyses were performed by one-way ANOVA with Tukey HSD, dependent t-test and non-parametric tests (p

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