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Table 1 Materials used in this study according to source, composition and batch, based on information supplied by the manufacturers, safety datasheets and solutions prepared in laboratory

From: Antioxidant pre-treatments are able to reduce waiting time for restorative treatment after dental bleaching: a microtensile bond strength exploratory study

Product

Manufacturer

Composition

Batch

Filtek™ Z250 (A3 color)

3M ESPE, USA

Bis-GMA, UDMA, TEGDMA, Bis-EMA, zirconia and silica filler particles (60 wt%)

NA13481

Grape seed extract (100 mg vegetable capsules)

Solgar Inc., USA

Microcrystalline cellulose and vitis vinifera extract containing 90% polyphenols

223113-05

Green tea sachets

(Tetley Green Tea Classic)

Tata Global Beverages GB Ltd. UK

Green tea leaves containing 0.62 mg/mL of flavanoids

191693

16% Opalescence PF Regular

Ultradent Products, USA

16% carbamide peroxide, potassium nitrate, sodium fluoride and water

BGP3

Optibond™ FL

Kerr, Italy

Primer: HEMA, GPDM, MMEP, ethanol, water and initiators

6732914

Adhesive: Bis-GMA, HEMA, GDMA, barium aluminosilicate, sodium hexafluorosilicate and fumed silica, initiators

Placebo gel

Fabricated at IUEM, Portugal

93.8% water, 5% glycerine and 1.2% carbopol

Scotchbond™ Etchant

3M ESPE, USA

Water, 34% ortophosphoric acid, polyethylene glycol, synthetic amorphous silica, aluminium oxide

4785595

Sodium ascorbate

Fabricated at IUEM, Portugal

Sodium ascorbate 10%, carbopol 934 (2.5%) and triethanolamine

(pH = 7)

  1. pH values were measured using a bench pH meter (Crison Basic 20 + , Crison Instruments, Spain)
  2. Bis-GMA bisphenol-A-glycidyl dimethacrylate, GDMA glycidyl dimethacrylate, GPDM glycerophosphate dimethacrylate, HEMA hydroxy ethyl methacrylate, N/A not available in the information supplied, MMEP mono(2-methacryloyloxy) ethyl phthalate, TEGDMA triethylene glycol dimethacrylate, UDMA urethane dimethacrylate