DC 102

Composite Resin

• Chemical makeup
  • Physical properties comparable to those of composite resins 
  • Low film thickness (thinner in consistency than composite resins) 
  • Insoluble in the mouth 

Uses of Composite Resin

• Cementation of ceramic or resin inlays and onlays.
• Cementation of ceramic veneers. 
• Cementation of orthodontic bands. 
• Direct bonding of orthodontic brackets. 
• Cementation of all metal castings.

Supply of Composite Resin

• Powder and liquid mix
• Syringe-type applicator
• Base and catalyst
• Base and catalyst in one syringe
• Light-cure/dual-cure system  
  • Recommended portions of either application are dispensed onto a paper pad and mixed rapidly with the use of a spatula. 

Examples of composite resin cements supplied in variable systems.

ZOE

• Chemical makeup
  • Liquid: eugenol, H₂O, acetic acid, zinc acetate, and calcium chloride 
  • Powder: zinc oxide, magnesium oxide,
    and silica 

Types of ZOE

• Type I 
  • Lacks strength and long‑term durability and is used for temporary cementation of provisional coverage
• Type II
  • Has reinforcing agents added for the permanent cementation of cast restorations
    or appliances 

ZOE type I cement for temporary cementation.

ZOE type II cement for permanent cementation.

Supply of ZOE

• Type I (paste) 
  • Supplied as a two‑paste system as
    temporary cement
  • Pastes dispensed in equal lengths
    on a paper pad and mixed 
• Type II (liquid/powder)
  • Mixed on an oil‑resistant paper pad
  • Mixing time of 30 to 60 seconds 
  • Setting time in the mouth of 3 to 5 minutes 

Polycarboxylate Cements

• Chemical makeup
  • Liquid: polyacrylic acid, itaconic acid, maleic acid, tartaric acid, and water
  • Powder: zinc oxide 

Uses of Polycarboxylate

• Permanent cement for cast restorations, stainless-steel crowns, and orthodontic bands 
• As a nonirritating base under both composite and amalgam restorations
• As an intermediate restoration

Supply of Polycarboxylate

• Powder/liquid
  • Liquid may be measured with the use of either a plastic squeeze bottle or a calibrated syringe‑type liquid dispenser.
  • The liquid has a limited shelf life because it thickens as its water evaporates.
  • Mixing is carried out on a nonabsorbent paper pad.  

Powder and calibrated syringe of polycarboxylate cement.