NITI ALLOY IN ENDODONTICS

NiTi Alloy in Endodontics

Table of Content

LITERATURE REVIEW1

A- ROOT CANAL INSTRUMENTATION TECHNIQUES1

RCT Instrumentation Techniques5

Hybrid Technique5

Passive Step back technique6

Circumferential filing8

Balanced force technique9

Advantages of this techniques:11

Disadvantages of this techniques:11

Crown down Pressureless12

Watch Winding Technique12

Endodontic Irrigation13

Anticurvature Technique21

B. STAINLESS STEEL INSTRUMENT25

1. Feed Rate29

2. Depth of Cut29

3. Speed of Wheel30

C-NITI ALLOY32

NiTi Rotary Instruments32

Comparision Between Niti Files (Hand And Rotary) And Stainless  Steel File Hand Files37

What the Flat Does38

Two NiTi Instruments40

The Proper Cutting Stroke41

Effect Of Different NiTi Instruments On Canal Shape42

Centering Ability Of different NiTi Rotary Instrument44

Fractured Instruments in Rotary Nickel-Titanium Endodontics45

NiTi's Narrow Window46

Progress48

REFERENCES50

LITERATURE REVIEW

A- ROOT CANAL INSTRUMENTATION TECHNIQUES

Successful intervention in the root canal consists of the cure and repair of the tissues involved and is based on the fulfillment of the following requirements: chemical-mechanical instrumentation, microbiological control and root canal sealing. It should be pointed out that the various phases of endodontic treatment are interdependent, with equivalent and additive importance and responsibility in terms of successful or unsuccessful total treatment. Among these phases, the chemical-mechanical instrumentation of the root canal requires the most time and the best preparation of the professional. (Wildey, 2001, 198)

Several studies have shown that dentin filings, necrotic tissue, pulp remnants, microorganisms and irrigating solution may be forced towards the periapical tissues during root canal instrumentation. Thus, extrusion of the material is a problem that occurs with the use of various instrumentation techniques As dentists we want to give best service to our patients. When he needs a root canal we want to give him the best. The best is to rid the canal of all debris and bacteria and then obturate it so that it can give him years of service. At the same time we want the procedure to be done in a smooth fashion without much stress and without tension of instrument or treatment failure.

Shaping the canal to receive proper obturation to achieve hermetic seal. This is done by use of instruments.

Cleaning the canal to make it bacteria free. This is done by instrumentation and irrigation. Some areas of canal are so small that irrigants can not reach unless those areas are enlarged at least to size 30.

Avoid excessive destruction of coronal portion by using large tapered instruments so that after restoration tooth can serve in mouth without being weakened.

First two of these goals are crucial  for the apical third because if any bacteria are left in this area apical periodontitis will recur leading to treatment failure. (or you will land up doing many apicoectomies and retrograde fillings to get  apical seal )

New instruments and materials are being introduced faster than you can manage to comfortably understand and master. When you approach a new technique/ material  its very important to have a clear concept of what you want to achieve. Multitude of scientific studies emphasize the fact that a cleaner canal dictates the prognosis of a root canal treated tooth. And we know that apical third is the most critical area from this stand point. (Thomas, 2004, 437)

Preparing of Endodontics Access is very ...