Dental cements: Zinc oxide, Copper, EBA, Zinc Oxyphosphate, Glass-ionomer and MoreUses of Dental cementsTemporary or semi-permanent fillingsTo cement
- 1 Dental cements: Zinc oxide, Copper, EBA, Zinc Oxyphosphate, Glass-ionomer and More
- 1.0.1 Uses of Dental cements
- 1.0.2 Uses of zinc oxide and eugenol
- 1.0.3 Properties of zinc oxide and eugenol
- 1.0.4 Accelerated zinc oxide-eugenol
- 1.0.5 Special zinc oxide-eugenol products
- 1.0.6 Uses of polycarboxylates
- 1.0.7 Properties of zinc polycarboxylates
- 1.0.8 Zinc Oxyphosphate
- 1.0.9 Uses of copper cements
- 1.0.10 Properties of copper cements
- 1.0.11 Glass-ionomer (ASPA) cement.
Dental cements: Zinc oxide, Copper, EBA, Zinc Oxyphosphate, Glass-ionomer and More
Uses of Dental cements
- Temporary or semi-permanent fillings
- To cement in position crowns, inlays, and bridges.
- To line cavities in order to prevent thermal or chemical damage to the pulp.
- Support of remaining weak tooth structure.
The main cements used are :
- Zinc oxide and eugenol
- Accelerated zinc oxide eugenol.
- Specific zinc oxide eugenol products.
- EBA cements.
- Zinc polycarboxylates.
- Zinc and copper phosphates.
- Glass-ionomer cements.
Zinc oxide and eugenol
Uses of zinc oxide and eugenol
- Protective cavity sub-linings (over which an oxyphosphate lining is placed for resistance to packing and biting pressure).
- Sedative or obtundent (soothing) dressings(eugenol relieve’s painful hyperaemia of the pulp).
- Temporary fillings.
- Pulp caps.
- Root canal fillings.
- Periodontal packs.
Properties of zinc oxide and eugenol
- Consists of a liquid and powder:-powder consists of zinc oxide,magnesium oxide,and zinc acetate (an accelerator ).liquid contains eugenol,olive oil,and acetic acid as an accelerator.
- Sedative action on pulp.
- Prevent conduction of heat to pulp.
- Very soluble in water.
- Very weak.
For more information: Properties and uses of dental fillings
Accelerated zinc oxide-eugenol
Special zinc oxide-eugenol products
Uses of polycarboxylates
- Cementation of fixed orthodontic appliances.
- Cavity linings.
Properties of zinc polycarboxylates
- They originally consisted of :
a. Powdered zinc oxide with small quantities of magnesium oxide.
a. As a lining, thick mix for strength and lessened risk of pulpal damage as there is a lower proportion of acid.
b. As a cement, slightly thinner to provide a reduced thickness of cement between crown and tooth.
Powder is added slowly, using a little at a time from three or four heaps, to slow the setting rate. Each heap is mixed in thoroughly before the next is added. The spatula is rapidly moved in circles around the slab ensuring that no unmixed particles of powder are left. Spatulation must cease by the time setting begins or mix will be weakened.
One minute is the usual time for spatulation.
As with all meterials, the correct quantities of liquid and powder should have been placed on the slab. This assessment of amounts gets easier with practice. Under no circumstances should any be returned to the bottle as it will be contaminated, and so will affect subsequent mixes.
After use the slab should be placed in warm water to facilitate cleaning. The glass should not be scratched or later mixes of cement will tend to stick to it.
Stoppers must be replaced immediately on bottles, as water is lost or absorbed according to atmospheric humidity. Absorption leads to speedier setting times; evaporation slows it down. If sufficient evaporation has occurred for crystals to appear in the bottle the liquid must be discarded.
Uses of copper cements
- To cement splints to the teeth of patients with fractured jaws.
Properties of copper cements
- It is similar to zinc phosphate cement, but the powder contains a copper compound in addition to zinc oxide. The colour varies according to the type of copper oxide:-
Red if cuprous oxide.
Glass-ionomer (ASPA) cement.
- Erosion cavities.
- Deciduous restorations .
- Cementation of porcelain crowns.
- Fissures sealants.
- Consists of a powder and liquid.
Powder relates to silicates, consisting of fused quartz and alumina.