INTRODUCTION & Types of dental TERMINOLOGY crown Part I: General considerations
According to retention*, dentalcrown classified as follows:1. Extra-coronal restorations2. Intra-coronal restorations3. Intra- radicular restorations *Retention: is the maintenance of dental prosthesis in proper position in the mouth.
Restorations used to cover the external partof the damaged coronal portion of the tooth. According to the surface coverage, extra-coronalrestorations classified as:1. Full coverage restorations: that means, restorations that cover the entire coronal portion of the crown.2. Partial coverage restorations: cover just a portion of the crown.
These are used to restore all surfaces of the clinical crown. an example seen in the picture. And they are classified accordingto the material used in theirconstruction, as: 1. Metal crowns (or restorations) 2. Non-metal crowns (or restorations) 3. Combination of both of the two above. …each of these types will be discussed later.
These restorations are used to cover just a portion of the clinical crown. an example seen in the picture. And according to retention, there areClassified as: 1. Retention by grooves : ¾, R3/4, ½, 7/8 crowns (= restorations). 2. Retention by pins (pinledage). 3. Modified type (grooves + pins). …each of these types will be discussed later.
Restorations used to cover a part of the internal portion of the damaged natural crown of the tooth.Types: - Inlays, and - Onlays (has been discussed before)
These restorations restore the endodontic- ally treated tooth. …….an example seen in the picture.Types: - according to retention: - Retention by post - Retention by post and core -according to attachment: - Attached - Detached - according to material used: - all metal *Post crown: is an artificial restoration retained in position by a post inserted in the prepared root canal and then - combined covered by a crown constructed on full or partial metal core.
Full coverage restoration, means: a. restore the endodontically treated tooth. b. cover for the external surfaces of the damaged clinical crown. c. ½ crown.True or False: The intra-coronal restorations are restorations used to cover the external part of the damaged clinical crown.What does dental crown mean? Enumerate its several types.