Back in the late 60s of the last century, polycarboxylate cements began to be used.
They are used in dentistry to fix non-removable dental structures and as protective pads for fillings.
Composition and properties of pkts
The product consists of two components: powder and liquid.
Powder is converted zinc oxide with addition of magnesium oxide. The liquid consists of a 37% water-based polyacrylic acid solution.
Properties:
- providing a chemical relationship with the tooth tissue;
- the formation of a strong bond with the metal, especially if it was treated with a sandblasting device;
- the carboxylate has low pulp toxicity.
The finished working solution has the appearance of a pasty consistency, with a smooth and shiny surface.
Carboxylate cements have their own advantages and disadvantages:
| Dignity | disadvantages |
|---|---|
| According to biological characteristics, they have great compatibility with dental tissues | Has the property of dissolving in the mouth over time |
| Do not let the acids that are formed at the time of the filling hardening | |
| Not a pulp irritant | Insufficient strength |
| Good adhesion to hard tooth surfaces |
Method of application
The material is used to fix different types of inlays and crowns, small-sized prostheses - bridges, orthodontic appliances. Used for filling children's teeth, as well as for temporary fillings.
A clean glass and a spatula are used to mix the polycarboxylate cement mortar.
Just before kneading, the required amount of liquid base is dripped onto the glass from a bottle with a dropper. To prevent the liquid from evaporating, the bottle must be closed immediately. Then add powder and mix quickly for about 30 seconds.
The powder must be added in portions, before dividing it into two equal parts. First, one lobe is combined and mixed with liquid for 15 seconds. Then add the second and continue to mix until homogeneous (in time, the same as the first).
The best powder to liquid ratio is considered to be 0.4: 0.2, respectively.
If the temperature in the office exceeds 22 ° C, then the dose of powder must be reduced or a little more liquid must be added.
From the beginning of mixing, the prepared composition must be used within 1-2 minutes. The indicator can be the glossy and shiny surface of the prepared paste.
The hardening time of the cement is 5-10 minutes. With more liquid, hardening takes longer.
The solidification rate depends on:
- the correct proportion of powder to liquid;
- the reactive susceptibility of zinc oxide;
- particle size and the presence of additional impurities;
- polyacrylic acid content.
After 10-12 hours, the material completely hardens. Food can be taken no earlier than 4 hours after mouth processing.
Filling of tooth canals on video:
Popular brands and manufacturers
The brands and manufacturers presented in the table have proven themselves well:
| Name | Manufacturer |
|---|---|
| "Belokor" | VladMiVa |
| "Belokor" | Rainbow-R |
| "Carbofain" | Spofa dental |
| Polycarboxylate cement | Stoma |
| Polycarboxylate cement | Medpolymer |
| Polycarboxylate cement with potassium nitrate | Medpolymer |
| Adhesor carbofine | Spofa dental |
| Aqualox | Voko |
| Carboxylatzement Bayer | Bayer |
| Cimex | Dent America |
| Durelon Powder | ESPE |
| PolyCarb | PSP Dental |
| PR Scell Policarboxylate | Pierre holland |
| Selfast | Septodont |
| Carboxylatzement Bayer | Bayer |
The site is for informational purposes only. Do not under any circumstances self-medicate. If you find you have any symptoms of illness, contact your doctor.