Silicate cements(Sylycyn, Fritex)

For root seals.

Requirements to sealing materials for permanent seals

· Not to be dissolved in oral liquid

· To harden in the presence of moisture

· The factor of thermal expansion should be similar to factor of thermal expansion of enamel and dentine

· To possess insignificant heat conductivity and minimum water absorption

· To be indifferent to tooth tissues, non-toxic

· To possess durability similar to durability of enamel of a tooth

· To be erased slowly

· To be cosmetic, X-ray contrast

To possess high adhesion to firm tissues of a tooth. Cements (D. S. Smith, 1995):

· Phosphatic – (Zinc-phosphatic, Silico-phosphatic, Silicate)

· Phenol- (Zinc-eugenol, Ca (OH) ₂ Salycylatic)

· Polycarboxylate (Zinc- polycarboxylate, Glass-ionomer)

· Acrylic (Polymetacrylic, Dimethylacrilic)

Cements on the basis of phosphates

Zinc-phosphatic cements (ZPC, Phosphate-cement, Adhesor)

1. Structure: powder - oxide zinc, 10 % oxide magnesium.

2. Liquid - water solution of phosphoric acid, 2-3 % aluminium, 0-9 % zinc.

3. Advantages: Easy to work, hardens fast, relative durability, good isolating properties, small toxicity.

4. Disadvantages: absence of antibacterial effect, fragility, weak adhesion, solubility in an oral liquid.

5. Use: lining for pulp protection, constant seals in temporary teeth at stage of root resorption, temporary seals.

Silico-phosphatic cements ( Sylydont, Infantid, Lumikolor Cement)

1. Structure: powder - 10-20 % oxide zinc, silicate glass (12-25 % fluoride). Liquid - a solution orthophosphoric acid, containing 45 % of water, 2-5 % aluminium and zinc

2. Advantages: durability, partial transparency, anti-carious action.

3. Disadvantages: high acidity of a seal toxic action on a pulp.

4. Use: sealing of cavities of the I-st, II-nd classes.

1. Structure: powder - 29-47% Si0₂, 15-35% Al₂0₃, 0,27-14% CaO, 5-15%. Liquid – solution of the phosphoric acid, containing aluminium, zinc and magnesium phosphate.

2. Advantages: anti-carious action, transparency, durability.

3. Disadvantages: solubility in an oral liquid, low adhesion, toxicity, fragility.

4. Use: sealing of cavities of the III-d, IV-th, V-th classes.

Phenol cements

This class concerns:

· simple combination of zinc and eugenol;

· materials on a basis of zinc-eugenol with filler.

Zinc-eugenol ( Caryosan, Zinoment)

1. Structure: powder - oxide zinc, liquid - purified eugenol or Carnation oil.

2. Advantages: good hermetic sealing of carious cavities, anti-inflammatory and plastic-stimulating action.

3. Disadvantages: low durability, slows down polymerisation of composit materials.

4. Use: time sealing, linings for pulp protection.

Zinc-oxide eugenol cements with filler

1. Structure: powder oxide zinc, 10-40 % rosin or synthetic pitches, catalysts.Liquid - cleared eugenol or Carnation oil (may contain acetic acid, tymol).

2. Advantages: antiseptic action, low heat conductivity.

3. Use: linings for pulp protection, time sealing.

Ca(OH)₂ Salycylatic –

(Calxyd, Dycal, Calcimol - self-cured materials;

Lica, Ultra Blend Plus - light cured materials).

1. Advantages: anti-inflammatory and plastic-stimulating action.

2. Disadvantages: high solubility, low durabiliti.

3. Use: linings for pulp protection.

Poly-carboxyl cements
Zinc-poly-carboxyl cement (Adhesor Carbofine, Carboco)

1. Structure: oxide zinc powder, 1-5 % oxide magnesium, liquid - 40 % water solution of polyacryle acid or copolymer of acryle acids.

2. Advantages: good adhesion to tooth tissues, hardness, ease to work.

3. Disadvantages: high solubility in an oral liquid, low adhesion.

4. Use: linings for pulp protection, time sealing.

Glass-ionomer cements.

1. Structure: powder Si0₂-Al₂0₃-CaF, Al (PO)₄ Na₃A1F₃; Al₂0₃/SIO₂=1:2,F to 23 %. Liquid - a copolymer polyacryle acid or ordinary water.

2. Advantages: chemical adhesion to dentine and to the majority of stomatological materials, factor of thermal expansion similar to to a factor of enamel and dentine, low solubility after becoming hard, X-ray contrast, biocompatibility with tooth tissues.

3. Disadvantages: fragility, insufficient aesthetics.

4. Use: sealing non-carious impairment of solid tissues of the teeth, sealing of a root's caries, temporary (kept away for 1-2 years) sealing of a permanent teeth, caries treatment with ART techniques, sealing carious cavities of all classes in temporary teeth.

Types of glass-ionomer cements:

- fixing (Ketac-Cem, Fuji Ortho, Fuji I (GC));

- for restoration;

- for linings (Aqua Cent);

- for aesthetic restorations (Ketac-Fil, Ketac-Molar, Fuji II, Fuji IX (GC), Ionofil (VOCO)).

Дата добавления: 2014-01-05