Question 30 (part 2) · LDEK · Endodontic instruments
Instruments for root canal preparation are finished with clearly narrowing apex, which can be rounded and non-cutting (safety tip). Choose correct statements regarding such instruments:
1) such shaped instruments are meant for curved canals preparation;
2) thanks to the cutting edges, which are located on the apical surface, cutting the dentin is possible;
3) cutting edges located on the apical surface are grinded, which allows for smoothness of the surface;
4) non-cutting apex determines central location of the instrument in the canal, and hence its sliding alongside the natural canal lumen;
5) such apex type inhibits the central location of the instrument in the canal, and hence prevents from its wedging;
6) such apex type protects from complications in the form of drilled niche or canal perforation.
Correct answer is:
2) thanks to the cutting edges, which are located on the apical surface, cutting the dentin is possible;
3) cutting edges located on the apical surface are grinded, which allows for smoothness of the surface;
4) non-cutting apex determines central location of the instrument in the canal, and hence its sliding alongside the natural canal lumen;
5) such apex type inhibits the central location of the instrument in the canal, and hence prevents from its wedging;
6) such apex type protects from complications in the form of drilled niche or canal perforation.
Correct answer is:
- A. 1,2,4.
- B. 1,3,5,6.
- C. 1,2,5.
- D. 3,4,5.
- E. 1,3,4,6.
Hint
A safety tip has no cutting edges at its end; think about how that affects guidance along the canal and the risk of ledges.
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