DENTIN BONDING AGENTS

Which of the following constituents is common in occlusal sealants, bonding agents and composite resins?

• Bis-GMA

• Polymethyl methacrylate

• Benzoin methyl ether

• Silica filter

Acid etching is done for

• 15 seconds

• 60 seconds

• 90 seconds

• 120 seconds

Dentin bonding agents usually contains

• only hydrophilic component

• only hydrophobic component

• hydrophobic and hydrophilic component

• lyophilic and lyophobic component

When restoring a tooth with resin material, acid etching can do all of the following, except?

• Increase the surface area

• Permit chemical bonding between resin and enamel

• Create surface irregularities in enamel for better mechanical retention of resin

• Condition the tooth surface for better wetting

Dentin conditioner has which of the following function?

• Removes smear layer

• Increases surface energy of dentin

• Forms a thin resin layer over exposed collagen fibrils

• Helps in bonding with composite

Most advantageous indication of acid etching is

• Decrease microleakage

• Decrease polymerization shrinkage

• Decrease coefficient of thermal expansion

• Decrease porosity in restorative material

Etchant preferred in gel form than in liquid form is

• For better control over placement

• Enhance and concentrate the action of acid

• Helps in visualization while placement

• None of the above

An acidic agent that dissolves the inorganic structure in dentin that allows infiltration of adhesive resin is

• Dentin bonding agent

• Dentin conditioner

• Primer

• None of the above

Diluent used in Bis-GMA based composites is

• 4 META

• TEGDMA

• UDMA

• CDMA