In 3rd generation dentin bonding agents, HEMA (Hydroxyethylmethacrylate) is  
1. a hydrophilic monomer that wets the dentinal surface  
2. a hydrophilic resin that forms a ”hybrid” layer by chemically reacting the intertubular dentin.  3. a hydrophilic monomer that alters collagen to promote cross linking of collagen to dentin.  4. a bifunctional molecule resin that copolymerizes to bis-GMA resins.  
a. 1,2  
b. 1,4  
c. 2,3  
d. 1,3  
e. 3,4

1 Answer

Answer :

b. 1,4

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