ZINC SILICOPHOSPHATE

It is a combination of silicate and ZnP cement Properties fall between those of ZnP and silicate. pH: lower than of ZnP and has got degree of translucency. Anticariogenic property because of fluorides.

Zinc Polycarboxylate: Composition: Available as powder and liquid Available as powder to be mixed with plain water Powder ZnO MgO Traces of other oxides

Liquid: Polyacrylic acid Tartaric acid Maleic acid Iticonic acid

Properties: Working time : 3-6mins Setting time 5.5mins Mixing time: 30 to 60secs Compressive strength (24hrs): 8000psi Tensile strength: 900psi Film thickness: 21mm Pulp response: mild Binds chemically to tooth structure

Uses: Primary Uses Luting agent for cementation of restorations Thermal insulating base Secondary uses cementation of orthodontic appliances and intermediate restorations

Advantages over ZnP Not irritant to pulp due to high mol. size Binds chemically to tooth structure Can be used safely in moderately deep cavities. No need to use cavity varnish.

ZINC OXIDE EUGENOL

Type I : Temporary luting or cementation Type II: Permanent cementation ex: kalzinol Type III: Intermediate restoration, thermal insulating base, temporary restoration. Type IV: Cavity liners or subbase Examples: Type III: IRM Type IV: Dycal and life

Basic Composition: As Powder and Liquid Powder: ZnO- Main ingredient – 70% White rosin – reduces brittleness of cement Zinc acetate – improves strength Zinc stearate – acts as plasticizer

Liquid: Eugenol : 85% Sedative effect to pulp Olive Oil: 15%

Modifications in basic composition Type II – Ethoxy benzoic acid/Resins are added increases the strength of the cement Type III- Resin reinforced, partially polymerized surface treated with propionic acid Increases strength and abrasive resistance Type IV – 2 paste system. Active ingredient in both pastes is Ca OH.

Examples: Type I: Tempbond / Neogenol / Freegenol II: Kalzinol III: IRM IV: Dycal Chemistry of Setting: ZnO + H2O Zn (OH)2 Zn hydroxide Zn (OH)2 +2HE ZnE2 + 2H2O Base Acid Zn – eugenolate salt

MANIPULATION

Mixed on glass slab or mixing pad Mixed on glass slab or mixing pad. Powder is dispensed and liquid is collected just prior to the mixing. Bulk of the powder is incorporated into the mixture and spatulated with a stainless steel spatula till it becomes paste on creamy in consistency. Powder or cotton fibers can be added which will improve the retention of the cement in the cavity.

Properties: Setting time : 4-10mins Compressive strength (after 24hrs): 4000psi Film thickness: 25um Solution and disintegration: 0.04% by wt Pulp response mild

Uses: Primary Application Temporary restoration Intermediate Temporary luting Permanent Thermal insulating base Pulp capping agent

Secondary application As root canal sealants and in RC restorations Periodontal dressings

CALCIUM HYDROXIDE CEMENT

Available as powder or 2 paste cements It is available as dry powder or two paste system. Mixed either with distilled water or saline to form a paste as it can also be suspended in chloroform and conveyed to the required area with the help of a syringe

When available as 2 paste cements. One paste – monomer of methyl cellulose as initiator and CaOH Other paste: Calcium hydroxide and catalyst, when they are brought in contact methyl cellulose undergoes polymerization and porous matrix is formed pH:11

Mechanism of action: Uses: Cavity liner Pulp capping agents