NiTi Rotary Instruments

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Questions and Answers

What is the speed range of conventional low speed hand piece for using Gates-Glidden (GG) burs?

20,000-40,000 rpm (correct)

40,000-60,000 rpm

5,000-10,000 rpm

10,000-20,000 rpm

What is the purpose of Gates-Glidden (GG) burs?

Preparing the post space

Working on the apical region of the root canal

Removing debris from the root canal

Widening the orifices & flaring of the coronal & mid 2/3 (correct)

What is the motion type of engine driven reciprocating instruments?

Back and forth motion at 1000 rpm

Oscillating motion at 2000 rpm

Continuous rotary motion at 3000 rpm

30 degree reciprocating motion at 1500 rpm (correct)

What is the frequency range of vibratory sonic engine driven instruments?

Less than 20 KHz Signup and view all the answers

What are the disadvantages of engine driven instruments mentioned in the text?

All of the above Signup and view all the answers

What property of Nickel Titanium Endodontic Instruments allows them to return to their original shape even if bent?

Super elastic property Signup and view all the answers

What is the composition of Nickel Titanium Endodontic Instruments?

55% Ni & 45% Ti Signup and view all the answers

What is the purpose of Peeso Reamers?

Post space preparation Signup and view all the answers

What is the corresponding ISO size range for Peeso Reamers?

1-6 Signup and view all the answers

What is the speed range of engine driven reciprocating instruments?

1500 rpm Signup and view all the answers

What is the frequency range of Ultra Sonic engine driven instruments?

20-50 KHz Signup and view all the answers

What type of irrigation does Ultra Sonic engine driven instruments use?

Electric- NaOCL irrigant Signup and view all the answers

What are the mode of failures of NiTi instruments?

Torsional and fatigue failures Signup and view all the answers

What are the advantages of Rotary NiTi instruments?

Effortless use, quick canal enlargement, easy debris removal Signup and view all the answers

What are the disadvantages of Rotary NiTi instruments?

Lack of tactile sensation, limited usage, easy fracture Signup and view all the answers

What are the different designs of NiTi rotary instruments based on?

Engineering criteria such as helical angle, pitch, clearance space, rake angle, and radial land Signup and view all the answers

What are the strategies to improve clinical performance of NiTi instruments?

Changing design, surface treatment, manufacturing procedure, thermo-mechanical treatment Signup and view all the answers

What can changing the design of NiTi instruments involve?

Multiple changing tapers, convex triangular cross-section, progressively changing helical angle and pitch Signup and view all the answers

What are the surface treatment techniques for NiTi instruments?

Electropolishing and ion implantation Signup and view all the answers

What does the flute of the file do?

Collects soft tissue and dentine chips removed from the canal wall Signup and view all the answers

What are the different kinematics for NiTi instruments?

Reciprocation and the self-adjusting file (SAF) Signup and view all the answers

What can the instrument tip design be?

Round or batt tip to guide within the canal without cutting Signup and view all the answers

How are rotary NiTi files manufactured?

By machine grinding except for twisted files Signup and view all the answers

What can austenitic and martensitic crystalline structures revert to when stress is released?

The austenitic phase Signup and view all the answers

Study Notes

Improving NiTi Rotary Instruments for Root Canal Enlargement

Austenitic and martensitic crystalline structures can revert to the austenitic phase when stress is released
Rotary NiTi files are manufactured by machine grinding except for twisted files
Advantages of Rotary NiTi include effortless use, quick canal enlargement, easy debris removal, uniform and smooth canals, and time and instrument efficiency
Disadvantages of Rotary NiTi include lack of tactile sensation, limited usage, easy fracture, and higher cost than stainless steel instruments
Different designs of NiTi rotary instruments for canal preparation are based on engineering criteria such as helical angle, pitch, clearance space, rake angle, and radial land
The flute of the file collects soft tissue and dentine chips removed from the canal wall
Mode of failure of NiTi instruments includes torsional and fatigue failures
Strategies to improve clinical performance of NiTi instruments involve changing design, surface treatment, manufacturing procedure, thermo-mechanical treatment, different kinematics, and single file systems
Changing the design of NiTi instruments can involve multiple changing tapers, convex triangular cross-section, and progressively changing helical angle and pitch
Instrument tip design can be round or batt tip to guide within the canal without cutting
Surface treatment techniques include electropolishing and ion implantation
Different kinematics for NiTi instruments include reciprocation and the self-adjusting file (SAF)

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Description

Test your knowledge of improving NiTi rotary instruments for root canal enlargement with this quiz. Explore the advantages, disadvantages, designs, and failure modes of rotary NiTi files, as well as strategies for improving their clinical performance.