Temporary filling materials
These information can be found in the book Craig´s restorative dental materials.
Zinc phosphate cement
(Zinkoxid phosphate cement)
Powder:
Zinc oxide (magnesium oxide, silicon dioxide, bismuth trtioxide).
Liquid:
Orthophosphoric acid (buffered by adding aluminium and sometimes zinc), water (usually 1/3
of water).
When escess of zinc phosphate cement is brought into contact wuth the liquid the surface of
alkaline powder is dissolved by the acid liquid, resulting in an exothermic reaction.
The set zincphosphate cement is a hydrated amprphous network of zinc phosphate that
surrounds incompletely dissolved particles of zinc oxide.
Properties
Two consistencies are are in general use:
For luting – creamy consistency
For base – thick consistency like dought
Initial acidity during setting. It nay cause a pulpal response when there is only thin layer of
dentin between the cement and the pulp. Therefore zinc phosphate cement is not recomended
in deep cavities. It can be dissolved in saliva therefore.
The closure of the cavity is good, hermetic.
Purpose
It is a temporary filling material that can be used also as base and luting material.
The liquid is hygroscopic as well as the powder.
Mixing on glass pad – the rough side using spatula – the powder is adding to the liquid and
consistency must be homogenous.
Zinc polyacrylate cement (zinc polycarbpoxylate, zinkoxid polacyrboxylate)
Powder
Zinc oxide, magnesium oxide.
Liquid
Water solution of polyacrylic acid.
Principle of setting:
The set cement is a zinc polyacrylate ionic gel matrix that unites unreacted zinc particles.
The acidity is lower in comparison to zinc phosphate cement. It is more difficult for handling
and mechanical properties are worse. The closure of cavity is good.
Purpose:
It is a temporary filling material that cen be used also as base and luting material.
Zinkoxid eugenol cement
Powder:
Zinc oxide, white resin, zinc stearate, zinc acetate
Liquid:
Eugenol, olive oil.
Principle of setting:
A chelation reaction in which amorphous, zinc eugenolate is formed.
During mixing is important tio bring as much as possible powder into the liquid. The
consistency is like dought.
Purpose
Temporaty cementation for provisional crowns and bridges, provisional restorations, bases,
endodontic sealers.
The clousre of cavity is good. Eugenol disturbs setting of composite filling materials –
zinkoxideugenol cement is not recommended as temporary filling before plcement of
composits.
Guttapercha
Transpolyisopren, waxes, zinc oxide.
Thermoplastic material, non toxic, non hermetic.
Purpose.
Temporary filling esp. before making inlays. Guttapercha points for endodontology.
Zinc oxid sulphate cement
Powder:
Zinc oxide, zinc sulphate.
Liquid: destilled water.
Principle of setting
Hydratation of components of a powder.
Properties:
Non toxic material, good retentioín in the cavity.
Purpose:
Temporary filling material (1 – 2 weeks)
Nowadays this cement has been replaced with one component temporary filling materials
ready to use. These material usually consist of gypsum and resin and water accelerate their
setting.