3 endodontic-instruments-oral health rct pptx

oral health

1. Tip Design. Instrument tips have been described as cutting noncutting partially cutting The instrument tip has two functions: to enlarge the canal and to guide the file through the canal

2. A clinician who is unfamiliar with the tip design of a particular instrument is apt to do either of the following: (1) transport the canal (if the tip is capable of enlarging the canal and remains too long in one position) Or (2) encounter excessive torsion and break the file (if a noncutting tip is forced into a canal with a smaller diameter than the tip).

3. A good beginner’s rule is this: If the canal is smaller than the file, a cutting tip is more efficient. If the canal is larger than the file, using a less effective cutting tip can help prevent transportation

4. Hand Instruments for Canal identification The endodontic explorer: has two straight, very sharp ends that are angled in two different directions from the long axis of the instrument

5. endodontic spoons : These spoons have a much longer offset from the long axis of the instrument (for better reach inside constricted pulp chambers) than regular dental spoons. The spoons are used to remove carious material and to excise pulp tissue

6. The number of sides and the number of spirals determine whether the instrument is best suite for filing or reaming. A file has more flutes per length unit than a reamer.

7. Besides their configuration, the difference between files and reamers is their intended use . Files are manipulated with a rasping, or push-pull planing motion. Reamers are twisted and withdrawn; therefore, cutting takes place during rotation.

8. The use of reamers has declined in popularity because of their lack of flexibility (especially in larger sizes), their inability to prepare canals with anything other than a round crosssection , and their lack of cutting efficiency when compared with other instruments.

9. K-Type Instruments made from a steel wire that is ground to a tapered square or triangular cross section the wire then was rotated to form the spiral instrument

10. Permanent deformation occurs when the flutes become wound more tightly or opened more widely failure occurs in the counterclockwise direction more often the clockwise direction. Therefore K-type instruments should be operated more carefully when pressure is applied in a counterclockwise direction.