which not compatible to the pulp:
A- GIC
B- Zinc phosphate cement***
C- Zinc polycarboxylate cement.
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Zinc Phosphate Cements:
In this article we will talk about one of the oldest and most used cements in dentistry. It is based on the acid / base reaction, has a high resistance and its solubility is low.
It is indicated for the fixation of elaborate structures outside the mouth to tooth tissues. It is also used as a solid base in dental work or even as a temporary restoration solution.
This type of cement is composed of the mixture of liquid and powder, which according to the manufacturer's instructions will harden.
The liquid is formed by a mixture of phosphoric acid (64%) and water (36%), while the powder contains zinc oxide (90%) and other acids such as Mg, Bi and Si.
Phosphoric acid acts as a pulp irritant, has a Ph between 2 and 4 and its use is recommended together with an insulator such as cavity varnish. Zinc oxide and aluminum oxide salts can behave as buffers weakening the effect of phosphoric acid and retarding the performance of cement.
To make the powder of this type of cement, the components melt at a temperature between 1,000 and 1,400 ° C, forming a block that is subsequently crushed to a fine powder. The particle size has a direct influence on the hardening of the cement mixture. The smaller the particle size the faster the mixture will harden.
Here we describe its main features:
- Thermal and electrical insulator
- High values of compressive strength and low solubility
- As a base, it has sufficient consistency to withstand condensation loads of different materials.
Pros:
It is an economical type of cement, excess material is easily removed, it has been implanted in the market for years, its physical properties are good for clinical use and it is compatible with other restorative materials.
Cons:
High initial acidity and risk of irritation, lack of physical and chemical adhesion to the dental surface, low aesthetics and high percentage of microfiltration cases.
---------------------------
Zinc Phosphate Cements:
In this article we will talk about one of the oldest and most used cements in dentistry. It is based on the acid / base reaction, has a high resistance and its solubility is low.
It is indicated for the fixation of elaborate structures outside the mouth to tooth tissues. It is also used as a solid base in dental work or even as a temporary restoration solution.
This type of cement is composed of the mixture of liquid and powder, which according to the manufacturer's instructions will harden.
The liquid is formed by a mixture of phosphoric acid (64%) and water (36%), while the powder contains zinc oxide (90%) and other acids such as Mg, Bi and Si.
Phosphoric acid acts as a pulp irritant, has a Ph between 2 and 4 and its use is recommended together with an insulator such as cavity varnish. Zinc oxide and aluminum oxide salts can behave as buffers weakening the effect of phosphoric acid and retarding the performance of cement.
To make the powder of this type of cement, the components melt at a temperature between 1,000 and 1,400 ° C, forming a block that is subsequently crushed to a fine powder. The particle size has a direct influence on the hardening of the cement mixture. The smaller the particle size the faster the mixture will harden.
Here we describe its main features:
- Thermal and electrical insulator
- High values of compressive strength and low solubility
- As a base, it has sufficient consistency to withstand condensation loads of different materials.
Pros:
It is an economical type of cement, excess material is easily removed, it has been implanted in the market for years, its physical properties are good for clinical use and it is compatible with other restorative materials.
Cons:
High initial acidity and risk of irritation, lack of physical and chemical adhesion to the dental surface, low aesthetics and high percentage of microfiltration cases.
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