Research Article
Comparative Efficacy of Four Stain Removal Methods for Bleach-Shade Composite Resins after Immersion in Staining Solutions: An In Vitro Study
| | Product | Composition/type | Manufacturer/producer |
| | Composite resin |
| | Filtek Z350 | Nanohybrid
Resin matrix: Bis-PMA, DUDMA, Bis-GMA, TEGDMA
Filler: 82 w%/60 v%, including 0.6–1.4 µm ZrO2/SiO2 nanoclusters, SiO2 nanofillers
Shade: XWB | 3M ESPE, St. Paul, MN, USA |
| | Gradia Direct Anterior | Microhybrid
Resin matrix: UDMA, dimethacrylate comonomers
Filler: 73 w%/64 v%, including silica, 0.85 µm prepolymerized fillers
Shade: XBW | GC, Corp, Tokyo, Japan |
| | Stain removal procedure |
| | Home bleaching (HB) | HOME WHITENING
16% carbamide peroxide | Whitesmile GmbH, Germany |
| | Office bleaching (OB) | POWER WHITENING YF
40% hydrogen peroxide | Whitesmile GmbH, Germany |
| | Sof-Lex discs (SX) | Aluminum oxide-coated abrasive disc
medium (40 µm)—fine (24 µm)—x-fine (8 µm) | 3M ESPE, St. Paul, MN, USA |
| | Pumice (PC) | Pumice powder
medium | Cina, Iran |
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