Endodontics: Part 7 Preparing the root canal

doi:doi:10.1038/sj.bdj.4811823

British Dental Journal 197, 603 - 613 (2004)
Published online: 27 November 2004 | doi:10.1038/sj.bdj.4811823

Verifiable CPD Paper:
Endodontics: Part 7 Preparing the root canal

P Carrotte¹

Modern techniques for preparing the root canal involve a crown-down approach to more efficiently remove infected debris and to improve access for irrigants.
The balanced-force technique, with a 60° clockwise turn followed by a balanced anti-clockwise cutting motion, is accepted as the most efficient method of file manipulation, (except that when using Hand GT files the motions are reversed).
Copious irrigation with an appropriate antiseptic material is essential to clean the root canal system following shaping of the main canals.
The smear layer should be removed with an EDTA solution before placing an intervisit dressing, or carrying out obturation.

Endodontics

The modern concept of root canal treatment
Diagnosis and treatment planning
Treatment of endodontic emergencies
Morphology of the root canal system
Basic instruments and materials for root canal treatment
Rubber dam and access cavities
Preparing the root canal
Filling the root canal system
Calcium hydroxide, root resorption, endo-perio lesions
Endodontic treatment for children
Surgical endodontics
Endodontic problems

Research into root canal preparation has led to significant changes in instrumentation techniques. Hand files should be manipulated by the balanced-force technique. Recent designs of endodontic instruments have variable tapers giving improved shaping ability. Nickel-titanium rotary instruments will rapidly and safely open the main root canals creating deep space to permit full permeation of irrigant solutions. Practitioners considering changing their endodontic technique are advised to attend hands-on practical courses to gain competence before using these in clinical practice.

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