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First Generation Variable Taper Instruments

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Questions and Answers

Which of the following describes the cutting action of a file compared to scraping action?

Scraping action is more efficient and requires less force
Scraping action has a rougher feel
Cutting action is more efficient and requires less force (correct)
Cutting action is less efficient and requires more force

What can happen if excessive pressure is applied to a cutting file?

It can produce excessive torsion (correct)
It can improve the smoothness of the scraping action
It can help reduce surface defects
It can increase the cutting efficiency

How do the tapers of the ProTaper Universal rotary files differ between the shapers and finishers?

The shapers have decreased tapers in their coronal portions, the finishers increased the taper coronally
The shapers have decreased tapers in the apical portions, the finishers increased the taper apically
The shapers have increased tapers in their coronal portions, the finishers decreased the taper coronally (correct)
The shapers and finishers have the same tapers throughout

What is the purpose of the different tapers within a single instrument in the second generation files?

To provide asymmetrical cutting in different portions of the root canal (D) Signup and view all the answers

Which of the following techniques was incorporated to solve the threading-in effect in some second generation instruments?

Varying the pitch of the file (A) Signup and view all the answers

What was the purpose of the electro-chemical polishing process used in some second generation files?

To reduce surface defects (A) Signup and view all the answers

How many main instruments are there in the ProTaper Universal rotary file system?

6 (A) Signup and view all the answers

What is the purpose of the shaper instruments in the ProTaper Universal rotary file system?

To prepare the coronal and middle thirds of the root canal (B) Signup and view all the answers

What is the purpose of the finisher instruments in the ProTaper Universal rotary file system?

To prepare the apical third of the root canal (A) Signup and view all the answers

How does the pitch of a file relate to the number of spirals or threads per unit length?

Pitch is the distance between a point on the leading edge and the corresponding point on the adjacent leading edge (B) Signup and view all the answers

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