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Effect of Simulated Toothbrushing on Surface Roughness, Color Stability, and Gloss of Two Single-Shade Composite
Zeynep Hale Keles1, Vasfiye Isik2, Soner Sismanoglu3
1Department of Restorative Dentistry, Faculty of Dentistry, Istanbul Atlas University, Atlas Vadi Kampüsü, Anadolu Cd. No 40 Kağıthane, 34408 Istanbul, Türkiye.
This study found that Material A, a single-shade composite resin, maintained better surface integrity, color stability, and gloss after simulated toothbrushing compared to Material B. Surface roughness significantly impacted both color change and gloss reduction in these dental materials.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Surface Science
Background:
- Single-shade composite resins offer simplified shade matching in dental restorations.
- Evaluating the long-term surface properties and optical stability of these materials under mechanical stress is crucial for clinical longevity.
Purpose of the Study:
- To compare the surface roughness, color stability, and gloss of two single-shade composite resins after simulated toothbrushing.
- To investigate the correlations between surface roughness, color change, and gloss reduction.
Main Methods:
- Two single-shade composite resins (Material A and Material B) were tested.
- Specimens underwent simulated toothbrushing up to 15,000 cycles.
- Surface roughness (Ra), color parameters (CIE Lab*), and gloss were measured and analyzed.
Main Results:
- Both materials showed increased surface roughness with toothbrushing.
- Material B exhibited significantly higher roughness, greater color change (exceeding the clinical threshold), and more gloss reduction than Material A.
- Strong positive correlation between surface roughness and color change (r=0.826), and negative correlation with gloss change (r=-0.919).
Conclusions:
- Material A demonstrated superior resistance to surface degradation and better preservation of optical properties compared to Material B.
- Surface roughness is a key factor influencing color instability and gloss reduction in single-shade composites.
- Clinicians should consider material surface stability for predictable long-term clinical performance.
