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1. What is dental preparation? What are its types?

A dental restoration or dental filling is a treatment to restore the function. integrity, and morphology of missing tooth structure resulting from caries or external trauma as well as to the replacement of such structure supported by dental implants

They are of two broad types direct and indirect, that are further classified by location and size.

2. What is tooth preparation? What are the steps of tooth preparation?

Restoring a tooth requires two steps: preparing the tooth for placement of restorative materials and placement of them. The prepared tooth ready for placement of restorative materials is called a tooth preparation. Preparations may be intracoronal and extracoronal.

Intracoronal preparations serve to hold restorative material within the confines of the structure of the crown of the tooth. Examples include all classes of cavity preparation for composite or amalgam as well as those for gold and porcelain inlays.

Extracoronal preparations provide a core upon which restorative material will be placed to bring the tooth back into functional and aesthetic structure. for example crowns or onlays as well as veneers.

3. What is direct and indirect restorations? What is the difference between them?

The technique of direct restorations involves placing a soft filling into the prepared tooth and building up the tooth. The advantage of direct restorations is that they usually set quickly and can be placed in a single procedure.

As for indirect restorations, they are fabricated outside the mouth using the dental impressions of the prepared tooth. Common indirect restorations include inlays and onlays, crowns, bridges and veneers. They are often done using gold or ceramics in two separate visits to the dentist.