Table 1: Materials, chemical compositions and procedure used in the study.

Procedure Chemical composition Materials (Manufacturer)
The primer applied to the entire cavity wall and massaged over the entire area for 15 sec. A gentle stream of air used. The primer cured for 10 sec. phosphorylated methacrylates, Vitrebond copolymer, HEMA, Bis-GMA, water, ethanol, silane-treated silica filler, initiators, stabilizers Primer Silorane System Adhesive (SSA) (3M ESPE)
The bond applied to the entire cavity wall. A gentle stream of air used. The bond cured for 10 sec. hydrophobic dimethacrylate, phosphorylated methacrylates, TEGDMA, silane-treated silica filler, initiators, stabilizers Adhesive
The primer applied to the entire cavity wall and leaved it in place for 20 sec. The volatile ingredients evaporated with a mild air stream. HEMA , 10-MDP, hydrophilic dimethacrylate, water, accelerators, dyes, camphorquinone Primer Clearfil SE Bond (Kuraray,Tokyo, Japan)
The bond applied to the entire cavity wall. A gentle stream of air used. The bond cured for 10 sec. Bis-GMA , HEMA, 10-MDP, hydrophilic dimethacrylate, colloidal silica, initiators, accelerators, dyes, camphorquinone Bond
Silane treated quartz, 3,4-epoxycyclohexylcyclopolymethylsiloxane, Bis-3,4-epoxycyclohexylethyl-phenylmethylsilane, yttrium tri fluoride Filtek P90 (3M ESPE) Resin Composite
Bis-GMA, TEGDMA, silanated barium glass filler, silanated silica filler, silanated colloidal silica, dl-camphor Quinone, catalysts, accelerators, pigments Clearfil AP-X (Kuraray, Tokyo, Japan)
Silane treated ceramic, BIS-GMA,TEGDMA,BIS-EMA, silanetreted silica and zirconium oxide, functionalized dimethacrylate polymer Filtek Z350 flowable restorative (3M ESPE)

Abbreviations: HEMA, 2-hydroxyethyl methacrylate; Bis-GMA, bisphenol A diglycidylmethacrylate; TEGDMA, triethylene glycol dimethacrylate; 10-MDP, 10-Methacryloyloxydecyl dihydrogen phosphate; BIS-EMA, ethoxylated bisphenol A glycol dimethacrylate.

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