Why zinc phosphate is used as a base in amalgam?

Zinc phosphate cement is the best material having a high enough modulus to minimize deflection of the amalgam. Other dental cements, particularly zinc oxide–eugenol types, have low moduli; under occlusal function they allow too much deflection and brittle failure is likely to occur in the amalgam.

What’s the difference between liner and base?

Liners are defined as materials that are placed as thin (0.5 mm) coatings under a restoration. They are used to provide a barrier to chemical irritants and to reduce microleakage. In comparison, a base not only provides a barrier to chemical irritation, but can also provide thermal insulation.

What lining can be used under a composite filling?

In our practice, we have traditionally used resin modified glass ionomer (RMGI) liner/bases for deep cavities and composite procedures. By their nature, RMGI liners are typically fluid materials that can adapt more readily to the internal aspects of a cavity preparation.

What is isthmus in Class 2 cavity preparation?

The transition between the occlusal and proximal cavity is termed isthmus. This is the narrowest place of preparation and it is of fundamental significance for retention of the filling.

What is the use of zinc phosphate?

Zinc phosphate is used to produce corrosion resistant coatings that are typically applied either as part of an electroplating process or as a primer pigment. It reacts moderately with water and is acid soluble with zinc sources, allowing it to have good moisture resistance and galvanic substitution properties.

How do you use zinc phosphate cement?

Roll the mixed cement into a long roll and cut it into small pieces using the spatula. Using the large condenser, pick up a piece and place it into the prepared cavity and lightly condense; the cement should be placed up to 0.5 mm short of the DEJ. Be sure not to contaminate the walls of the cavity.

Can zinc phosphate cement be mixed on a paper mixing pad?

Zinc phosphate is used for permanent cementation of crowns, inlays, onlays, bridges, and ortho bands and brackets. Zinc phosphate cement is supplied in a powder and a liquid and is always mixed on a glass slab (rather than in a paper mixing pad).

Where are liners placed?

Liners are materials that are placed as a thin coating (usually 0.5 mm) on the surface of a cavity preparation. Although they provide a barrier to chemical irritants, they are not used for thermal insulation or to add bulk to a cavity preparation.

Can you use Dycal under composite?

Further studies are necessary to suggest that Dycal can be used without any inhibitions under composite resin restorations, may be in vivo studies with long-term follow-up of the outcome are required.

Where is the dental liner placed?

It protects the pupal tissue from irritation caused by physical, mechanical, chemical, and biological elements. Within the cavity preparation, where is a liner placed? Liner is placed only on the deepest dentin surface of the preparation.

What is the maximum angle of cavosurface and marginal amalgam angle?

D, Cavosurface angle should not exceed 100 degrees, and marginal-amalgam angle should not be less than 80 degrees.

What is pulp protective in operative dentistry?

In Operative Dentistry, the main objective is to restore the tooth affected by either caries, trauma etc with Restorative materials. These Permanent Restorative materials are harmful to the pulp when exposed to it, here is when the Pulp Protective agents come in.

What is a Class II restoration cavity?

3. 3 Class II Restorations. It is defined as a cavity that is present on the proximal surfaces of premolars and molars. ( G.V .BLACK ) DEFINITION

What is 2222 in dentistry?

22. 22 PREPRATION OF GINGIVAL SEAT:- It is an external cavity wall that is perpendicular to the long axis of the tooth. It is extended beyond the contact area or up to the proximal lesion whichever is more.