What is in type one powder ZOE (Zinc Oxide Eugenol) ??
-zinc oxide
-resin
-zinc acetate
- activator (accelerator)
ZOE has the strength needed for permanent cementation and retention; however, it is not as strong as what?
ZINC PHOSPHATE CEMENT
There are two types of ZOES.
They are different due to .......
their properties & uses
What are the three uses of Polycarboxylate cement?
-permanent cement (crowns, bridges, inlays, and onlays; for orthodontic bands, brackets, and appliances
-temporary restoration
-insulating base
How is Zinc Phosphate and Polycarboxylate Cement alike?
Both have zinc oxide as their main component.
What is another name for Polycarboxylate cement?
Zinc polyacrylate cement
What can you mix Polycarboxylate cement on?
-either a glass or paper mixing pad
Polycarboxylate cements sets in _______________ minutes.
Does Polycarboxylate produce an exothermic reaction?
3-5 minutes
NO
What KINDS/TYPES of cements are usually hand mixed by the dental assistant?
What is another name for cementing?
Self-cured
luting
-are easier to work with because they afford the operator the flexibility of additional manipulation and working time in the mouth prior to initiating the final cure.
Light-cured cements
What is ALWAYS mixed on a cool, glass slab?
Zinc Phosphate Cement
I have * low thermoconductivity-- less sensitivity to hot & cold *a long shelf life * low solubility---which resists breakdown in the mouth
Zinc Phosphate Cement
ZINC PHOSPHATE CEMENT
-has a powder & liquid
The powder is ZINC OXIDE powder. What is it made with?
zinc oxide
& a small amount of magnesium oxide
Before applying Zinc phosphate cement to the teeth what must be done and why?
You must add a base/liner to protect teeth because the liquid used in Zinc phosphate is acidic.
True or false ZINC PHOSPHATE CEMENT
The powder used known as Zinc oxide powder is available in a range of tooth-matching shades.
TRUE
Why do you have to mix ZINC PHOSPHATE CEMENT on a cool, glass slab?
Because of theexothermic reaction
I have
-a more viscous consistency, HOWEVER, I flow readily when applied to the surface.
-"kind to the pulp"
Polycarboxylate cement
In dentistry, cements are most commonly supplied in which ways?
*powder and liquid
*a two-paste system
*a capsule
*premixed dispensing syring
What may affect light-cured dental cements?
Ambient (outside) forms of light. ESPECIALLY by halogen or fluorescent light in the treatment room.
How many drops of Zinc Phosphate Cement is dispensed?
What should you do before adding the powder to the glass slab?
