Table 1. Bonding materials and procedures used in the present study.

Product Name	Manufacturer	Batch No.	Composition	Application
Luxatemp Glaze & Bond	DMG, Hamburg, Germany	719757	Multifunctional acrylates, MMA, catalysts, stabilizers, additives	1) Apply a thin layer 2) Light cure 20 s
Visio.link	Bredent GmbH & Co KG, Senden, Germany	142655	MMA, PETIA, dimethacrylates, photoinitiators	1) Apply a thin layer 2) Light cure 90 s
Single Bond Universal	3M ESPE, Deutschland GmbH, Germany	497909	MDP phosphate monomer, dimethacrylate resins, HEMA, Vitrebond™ copolymer, filler, ethanol, water, initiators, silane	1) Apply a thin layer by rubbing for 20 s 2) Gentle air stream for 5 s 3) Light cure 10 s
All-Bond Universal	Bisco Inc, Schaumburg, IL, USA	1300000367	MDP, bis-GMA, HEMA, ethanol, water, initiators	1) Apply a thin layer by rubbing for 15 s 2) Gentle air stream for 10 s 3) Light cure 10 s
Monobond Plus + Heliobond	Ivovlar Vivadent AG, Schaan, Liechtenstein	T29123 T34087	Silane methacylate, phosphoric acid methacryate, sulfide methacrylate Bis-GMA, TEG-DMA	1) Apply a thin layer of Monobond plus and vaporization for 60 s 2) Apply a thin layer of Heliobond and light cure for 10 s

MMA: methylmethacrylate; PETIA: pentaerythritol triacrylate; MDP: 10-methacryloyloxydecyl dihydrogen phosphate; HEMA: 2-hydroxyethyl methacrylate; Bis-GMA: bisphenol-A-diglycidylmethacrylate; TEGDMA: triethylene glycol dimethacrylate.