this power point is about the cleaning and shaping procedure of root canal system. it explains the cleaning process starting from the definition of cleaning, the materials and instruments used for cleaning. and the different motions for cleaning these are filing, reaming, filing and reaming..
The second phase of a root canal treatment.
This presentation covers the most basic techniques of root canal shaping.
provides the reader with a concise overview of the big picture.
This document discusses cleaning and shaping of root canals. It begins by defining cleaning and shaping and outlining their objectives. It then describes various phases and techniques for cleaning and shaping, including patency filing, working length measurement, coronal pre-enlargement, and root canal shaping techniques like step-back, crown-down, and hybrid techniques. It provides guidelines for instrumentation and discusses functional motions. The document provides details on each phase and compares advantages and disadvantages of different techniques.
1. Root canal preparation involves cleaning, shaping, and obturating the root canal system. The goals of shaping are to create a continuously tapering cone shape that follows the natural canal, while avoiding transportation of the foramen and keeping the apical opening small.
2. There are various techniques for instrumentation including reaming, filing, balanced force, and watch winding. The balanced force technique involves oscillating the instrument with different arcs in each direction to efficiently cut dentin while preventing ledging.
3. Standardized preparation, step-back, and passive step-back techniques are described. The passive step-back technique uses hand and rotary instruments to gradually flare and then shape the canal from apical to
1. Cleaning and shaping of the root canal is essential for root canal treatment success by removing all contents from the root canal system.
2. Various techniques have been developed over time for root canal instrumentation including step-back, crown-down, and balanced force techniques.
3. Contemporary techniques such as ProTaper Next and Self-Adjusting File use engine-driven files and continuous irrigation for more efficient cleaning and shaping of the complex root canal anatomy.
This is a presentation which describes in details, the shaping aspect of root canal in root canal therapy. This gives the newer files systems being used
The document discusses various techniques for cleaning and shaping the root canal system during endodontic treatment. It describes the objectives and basic principles of root canal preparation, including removing debris and maintaining the original shape of the canal. Several techniques are summarized, such as step-back, crown-down, balanced force, and ultrasonic instrumentation. For each technique, the document outlines the steps and discusses advantages and disadvantages.
The document discusses cleaning and shaping of the root canal, which involves removing potentially pathogenic contents from the root canal system through cleaning, and establishing a tapered shape through the canal to allow for obturation. It outlines the objectives of endodontic treatment, and explains that cleaning and shaping is an important step to eliminate apical periodontitis by disinfecting and sealing the root canal. The principles of root canal instrumentation are also described, including maintaining the original shape of the canal, using irrigation, and preparing the canal in a gradual, sequential manner from small to large instruments to ensure the apical foramen is not over-enlarged.
This document discusses various root canal preparation techniques including step-back, crown-down, and balanced force techniques. It provides details on each technique's procedures, advantages, and limitations. The step-back technique involves initial apical preparation followed by step-wise coronal preparation to create tapers. Crown-down starts with coronal flaring before apical instrumentation to minimize debris extrusion. Hybrid and balanced force techniques combine aspects of different methods.
The second phase of a root canal treatment.
This presentation covers the most basic techniques of root canal shaping.
provides the reader with a concise overview of the big picture.
This document discusses cleaning and shaping of root canals. It begins by defining cleaning and shaping and outlining their objectives. It then describes various phases and techniques for cleaning and shaping, including patency filing, working length measurement, coronal pre-enlargement, and root canal shaping techniques like step-back, crown-down, and hybrid techniques. It provides guidelines for instrumentation and discusses functional motions. The document provides details on each phase and compares advantages and disadvantages of different techniques.
1. Root canal preparation involves cleaning, shaping, and obturating the root canal system. The goals of shaping are to create a continuously tapering cone shape that follows the natural canal, while avoiding transportation of the foramen and keeping the apical opening small.
2. There are various techniques for instrumentation including reaming, filing, balanced force, and watch winding. The balanced force technique involves oscillating the instrument with different arcs in each direction to efficiently cut dentin while preventing ledging.
3. Standardized preparation, step-back, and passive step-back techniques are described. The passive step-back technique uses hand and rotary instruments to gradually flare and then shape the canal from apical to
1. Cleaning and shaping of the root canal is essential for root canal treatment success by removing all contents from the root canal system.
2. Various techniques have been developed over time for root canal instrumentation including step-back, crown-down, and balanced force techniques.
3. Contemporary techniques such as ProTaper Next and Self-Adjusting File use engine-driven files and continuous irrigation for more efficient cleaning and shaping of the complex root canal anatomy.
This is a presentation which describes in details, the shaping aspect of root canal in root canal therapy. This gives the newer files systems being used
The document discusses various techniques for cleaning and shaping the root canal system during endodontic treatment. It describes the objectives and basic principles of root canal preparation, including removing debris and maintaining the original shape of the canal. Several techniques are summarized, such as step-back, crown-down, balanced force, and ultrasonic instrumentation. For each technique, the document outlines the steps and discusses advantages and disadvantages.
The document discusses cleaning and shaping of the root canal, which involves removing potentially pathogenic contents from the root canal system through cleaning, and establishing a tapered shape through the canal to allow for obturation. It outlines the objectives of endodontic treatment, and explains that cleaning and shaping is an important step to eliminate apical periodontitis by disinfecting and sealing the root canal. The principles of root canal instrumentation are also described, including maintaining the original shape of the canal, using irrigation, and preparing the canal in a gradual, sequential manner from small to large instruments to ensure the apical foramen is not over-enlarged.
This document discusses various root canal preparation techniques including step-back, crown-down, and balanced force techniques. It provides details on each technique's procedures, advantages, and limitations. The step-back technique involves initial apical preparation followed by step-wise coronal preparation to create tapers. Crown-down starts with coronal flaring before apical instrumentation to minimize debris extrusion. Hybrid and balanced force techniques combine aspects of different methods.
Cleaning and Shaping of the Root Canal System.pptxabibook49
Cleaning and shaping of the root canal system involves removing all contents from the canals to prevent microbial growth and develop a three-dimensional seal. It is assessed by clean shavings and colored irrigant. The goal is to make the canal continuously tapered, cleaned in multiple planes, narrower apically and wider coronally to avoid transportation and keep the apical opening small. Various instruments are used with reaming, filing, and patency motions to achieve these objectives.
This lecture explain the basic of root canal preparation in endodontic treatment. It is not meant to be a comprehensive lecture, rather an preliminary one
Cleaning and Shaping of the Root Canal System.pptxabibook49
Cleaning and shaping of the root canal system involves removing all contents from the root canals to prevent bacterial growth and developing a three-dimensional seal. This is done through mechanical and hand instrumentation to clean and shape the canals into a smooth, continuously tapering cone. Proper cleaning is assessed by clean dentin shavings and colored irrigants, and shaping allows for disinfection, filling, and sealing of the canals.
A concise and brief presentation on cleaning and shaping of root canals. Colorful and well pictured. Ideal for UG students and PG students to get a good understanding of BMP techniques.
cleaning and shaping of root canals in endodonticsSanghmitra Suman
This document discusses cleaning and shaping of the root canal during endodontic treatment. It describes the principles and techniques for preparing the coronal and radicular cavities, including outline form, convenience form, and resistance form. Various root canal preparation techniques are covered, such as step-back, step-down, hybrid, and balanced force techniques. Common root canal irrigants like sodium hypochlorite, hydrogen peroxide, EDTA, chlorhexidine, and MTAD are described in terms of their properties, mechanisms of action, advantages, and limitations.
This document provides an overview of cleaning and shaping of root canals using hand instruments. It discusses the objectives and techniques of cleaning and shaping, including irrigation, instrumentation motions, and traditional techniques like step-back preparation. Various instrumentation techniques are described, such as step-back, step-down, and hybrid techniques using balanced force concept. The importance of proper cleaning, shaping, and obturation for successful root canal treatment is emphasized.
This document provides an overview of cleaning and shaping techniques for root canals. It discusses the objectives of cleaning and shaping, which include removing pulp, bacteria, and debris while maintaining the original canal anatomy. Various instrumentation motions are described, including filing, reaming, watch-winding and balanced force. Irrigation solutions mentioned include saline, sodium hypochlorite, hydrogen peroxide and EDTA. The document also outlines techniques like step-back, step-down and hybrid for preparing root canals.
This document provides an overview of cleaning and shaping of root canals using hand instruments. It discusses the objectives and techniques of cleaning and shaping, including irrigation, instrumentation motions, and traditional techniques like step-back preparation. Various instrumentation techniques are described, such as step-back, step-down, and hybrid techniques using balanced force concept. The importance of proper shaping to achieve three-dimensional obturation is emphasized.
The objectives of root canal preparation are to clean the root canal of organic remnants and shape it to receive a three-dimensional filling. The canal is cleaned primarily through irrigation and shaped primarily by instrumentation to develop a continuously tapering conical form. The preparation should make the canal narrower apically, with the narrowest diameter at the terminus, in multiple planes without transporting the foramen and keeping the apical foramen as small as possible. Sodium hypochlorite is recommended as an irrigant as it dissolves organic debris, has antibacterial properties, and lubricates instrumentation.
This document describes the crown-down pressureless technique for cleaning and shaping root canals. It involves initially using larger Gates-Glidden drills and files in the coronal 2/3 of the root canal and progressively using smaller files until reaching the desired working length. This prevents debris from being extruded apically, as was a disadvantage of previous step-back techniques. The crown-down technique provides a coronal escapeway for debris and reduces the risk of extrusion.
This document provides an overview of biomechanical preparation for root canals. It discusses the history and principles of shaping and cleaning canals, including various instrumentation techniques and their objectives. It also covers variations in canal morphology like curved, C-shaped, and isthmus canals and challenges they present. The document emphasizes maintaining the original canal shape and anatomy while removing debris to achieve a continuously tapering preparation.
The document provides an overview of root canal instrumentation techniques and guidelines. It discusses the history of instrumentation, Schilder's objectives, principles of cleaning and shaping, variations in canal morphology like curved canals, C-shaped canals and isthmuses. It also describes functional motions used in instrumentation like reaming, filing, watch-winding and anticurvature filing. Finally, it classifies endodontic instruments into groups based on operation - hand, low-speed, engine-driven and ultrasonic/sonic.
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
The document discusses cleaning and shaping objectives, principles, and techniques in endodontics. It aims to remove canal contents, irregularities, and obstructions while maintaining the original canal anatomy and foramen size. Cleaning is achieved through instrumentation and irrigation, assessed by debris removal and smooth canal walls. Shaping provides a continuously tapering preparation from crown to apex. Working length is 1 mm from the radiographic apex. Techniques include step-back preparation from apex to crown in phases using increasingly larger instruments supplemented by irrigation and recapitulation.
The document discusses several root canal irrigation techniques:
1. The step-down technique aims to remove coronal interferences and debris before shaping the apical part of the canal.
2. The balanced force technique uses safe-tipped files and a positioning/cutting motion to shape canals while preventing ledges.
3. The crown-down technique shapes canals from the crown toward the apex, allowing for better debris removal and irrigant penetration.
The document discusses objectives and aids in root canal preparation. The objectives are to create a tapered funnel-shaped canal, retain instruments within the canal, develop an apical stop, and retain the original canal shape. Aids include using intracanal irrigants like sodium hypochlorite to flush debris, dissolve tissues, and act as an antibacterial lubricant. Instruments should be examined for defects before each use. Pre-curved instruments may be needed for curved canals, and instruments should be used sequentially from smaller to larger sizes.
Cleaning and shaping of root canal systemsSindhuVemula1
1. The document discusses various techniques for cleaning and shaping root canals, including standardized preparation, step-back preparation, and crown-down preparation.
2. It describes the objectives of cleaning and shaping as removing infected tissue, giving irrigants access to the canal, creating space for medication and filling, and maintaining root structure integrity.
3. The key motions for instrumenting the canal are filing, reaming, watch winding, and balanced force technique, with each motion suited to different phases of canal preparation.
This document discusses root canal preparation techniques. It describes the standardized/conventional technique where instruments are taken to full working length and enlarged until clean shavings are seen. Issues with this in curved canals include ledging, zipping and perforations. Alternative techniques include flaring from apical to coronal or vice versa to retain canal shape, allow more irrigant access, and easier placement of spreaders/cones. The step-back technique uses initially flexible small instruments in the apical portion. The crown-down technique shapes the coronal aspect first for straighter access and elimination of interferences before apical shaping.
1. Cleaning and shaping of the root canal involves removing debris and establishing a continuously tapering canal to allow for disinfection and filling.
2. There are various techniques for cleaning and shaping including step-back, crown-down, and balanced force, each aiming to optimize the mechanical, biological and clinical objectives.
3. The techniques differ in whether they work from the apex to the crown or vice versa, and use hand or rotary instruments in various sequences to safely and effectively prepare the complex root canal system.
Cleaning and Shaping of the Root Canal System.pptxabibook49
Cleaning and shaping of the root canal system involves removing all contents from the canals to prevent microbial growth and develop a three-dimensional seal. It is assessed by clean shavings and colored irrigant. The goal is to make the canal continuously tapered, cleaned in multiple planes, narrower apically and wider coronally to avoid transportation and keep the apical opening small. Various instruments are used with reaming, filing, and patency motions to achieve these objectives.
This lecture explain the basic of root canal preparation in endodontic treatment. It is not meant to be a comprehensive lecture, rather an preliminary one
Cleaning and Shaping of the Root Canal System.pptxabibook49
Cleaning and shaping of the root canal system involves removing all contents from the root canals to prevent bacterial growth and developing a three-dimensional seal. This is done through mechanical and hand instrumentation to clean and shape the canals into a smooth, continuously tapering cone. Proper cleaning is assessed by clean dentin shavings and colored irrigants, and shaping allows for disinfection, filling, and sealing of the canals.
A concise and brief presentation on cleaning and shaping of root canals. Colorful and well pictured. Ideal for UG students and PG students to get a good understanding of BMP techniques.
cleaning and shaping of root canals in endodonticsSanghmitra Suman
This document discusses cleaning and shaping of the root canal during endodontic treatment. It describes the principles and techniques for preparing the coronal and radicular cavities, including outline form, convenience form, and resistance form. Various root canal preparation techniques are covered, such as step-back, step-down, hybrid, and balanced force techniques. Common root canal irrigants like sodium hypochlorite, hydrogen peroxide, EDTA, chlorhexidine, and MTAD are described in terms of their properties, mechanisms of action, advantages, and limitations.
This document provides an overview of cleaning and shaping of root canals using hand instruments. It discusses the objectives and techniques of cleaning and shaping, including irrigation, instrumentation motions, and traditional techniques like step-back preparation. Various instrumentation techniques are described, such as step-back, step-down, and hybrid techniques using balanced force concept. The importance of proper cleaning, shaping, and obturation for successful root canal treatment is emphasized.
This document provides an overview of cleaning and shaping techniques for root canals. It discusses the objectives of cleaning and shaping, which include removing pulp, bacteria, and debris while maintaining the original canal anatomy. Various instrumentation motions are described, including filing, reaming, watch-winding and balanced force. Irrigation solutions mentioned include saline, sodium hypochlorite, hydrogen peroxide and EDTA. The document also outlines techniques like step-back, step-down and hybrid for preparing root canals.
This document provides an overview of cleaning and shaping of root canals using hand instruments. It discusses the objectives and techniques of cleaning and shaping, including irrigation, instrumentation motions, and traditional techniques like step-back preparation. Various instrumentation techniques are described, such as step-back, step-down, and hybrid techniques using balanced force concept. The importance of proper shaping to achieve three-dimensional obturation is emphasized.
The objectives of root canal preparation are to clean the root canal of organic remnants and shape it to receive a three-dimensional filling. The canal is cleaned primarily through irrigation and shaped primarily by instrumentation to develop a continuously tapering conical form. The preparation should make the canal narrower apically, with the narrowest diameter at the terminus, in multiple planes without transporting the foramen and keeping the apical foramen as small as possible. Sodium hypochlorite is recommended as an irrigant as it dissolves organic debris, has antibacterial properties, and lubricates instrumentation.
This document describes the crown-down pressureless technique for cleaning and shaping root canals. It involves initially using larger Gates-Glidden drills and files in the coronal 2/3 of the root canal and progressively using smaller files until reaching the desired working length. This prevents debris from being extruded apically, as was a disadvantage of previous step-back techniques. The crown-down technique provides a coronal escapeway for debris and reduces the risk of extrusion.
This document provides an overview of biomechanical preparation for root canals. It discusses the history and principles of shaping and cleaning canals, including various instrumentation techniques and their objectives. It also covers variations in canal morphology like curved, C-shaped, and isthmus canals and challenges they present. The document emphasizes maintaining the original canal shape and anatomy while removing debris to achieve a continuously tapering preparation.
The document provides an overview of root canal instrumentation techniques and guidelines. It discusses the history of instrumentation, Schilder's objectives, principles of cleaning and shaping, variations in canal morphology like curved canals, C-shaped canals and isthmuses. It also describes functional motions used in instrumentation like reaming, filing, watch-winding and anticurvature filing. Finally, it classifies endodontic instruments into groups based on operation - hand, low-speed, engine-driven and ultrasonic/sonic.
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
The document discusses cleaning and shaping objectives, principles, and techniques in endodontics. It aims to remove canal contents, irregularities, and obstructions while maintaining the original canal anatomy and foramen size. Cleaning is achieved through instrumentation and irrigation, assessed by debris removal and smooth canal walls. Shaping provides a continuously tapering preparation from crown to apex. Working length is 1 mm from the radiographic apex. Techniques include step-back preparation from apex to crown in phases using increasingly larger instruments supplemented by irrigation and recapitulation.
The document discusses several root canal irrigation techniques:
1. The step-down technique aims to remove coronal interferences and debris before shaping the apical part of the canal.
2. The balanced force technique uses safe-tipped files and a positioning/cutting motion to shape canals while preventing ledges.
3. The crown-down technique shapes canals from the crown toward the apex, allowing for better debris removal and irrigant penetration.
The document discusses objectives and aids in root canal preparation. The objectives are to create a tapered funnel-shaped canal, retain instruments within the canal, develop an apical stop, and retain the original canal shape. Aids include using intracanal irrigants like sodium hypochlorite to flush debris, dissolve tissues, and act as an antibacterial lubricant. Instruments should be examined for defects before each use. Pre-curved instruments may be needed for curved canals, and instruments should be used sequentially from smaller to larger sizes.
Cleaning and shaping of root canal systemsSindhuVemula1
1. The document discusses various techniques for cleaning and shaping root canals, including standardized preparation, step-back preparation, and crown-down preparation.
2. It describes the objectives of cleaning and shaping as removing infected tissue, giving irrigants access to the canal, creating space for medication and filling, and maintaining root structure integrity.
3. The key motions for instrumenting the canal are filing, reaming, watch winding, and balanced force technique, with each motion suited to different phases of canal preparation.
This document discusses root canal preparation techniques. It describes the standardized/conventional technique where instruments are taken to full working length and enlarged until clean shavings are seen. Issues with this in curved canals include ledging, zipping and perforations. Alternative techniques include flaring from apical to coronal or vice versa to retain canal shape, allow more irrigant access, and easier placement of spreaders/cones. The step-back technique uses initially flexible small instruments in the apical portion. The crown-down technique shapes the coronal aspect first for straighter access and elimination of interferences before apical shaping.
1. Cleaning and shaping of the root canal involves removing debris and establishing a continuously tapering canal to allow for disinfection and filling.
2. There are various techniques for cleaning and shaping including step-back, crown-down, and balanced force, each aiming to optimize the mechanical, biological and clinical objectives.
3. The techniques differ in whether they work from the apex to the crown or vice versa, and use hand or rotary instruments in various sequences to safely and effectively prepare the complex root canal system.
Muktapishti is a traditional Ayurvedic preparation made from Shoditha Mukta (Purified Pearl), is believed to help regulate thyroid function and reduce symptoms of hyperthyroidism due to its cooling and balancing properties. Clinical evidence on its efficacy remains limited, necessitating further research to validate its therapeutic benefits.
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3. Endodontic treatment mainly consists of three steps:
• Cleaning and shaping of the root canal system
• Disinfection
• Obturation
Cleaning and shaping is one of the most important step in the root
canal therapy for obtaining success in the root canal treatment.
3
4. Cleaning
• It comprises the removal of all potentially pathogenic contents
from the root canal system.
Shaping
• The establishment of a specifically shaped cavity which performs
the dual role of three-dimensional progressive access into the
canal and creating an apical preparation which will permit the
final obturation instruments and materials to fit easily
4
5. 5
Objectives
Mecanical Objectives:
• Continuously tapering cone (narrower apically)
– This shape mimics the natural canal shape.
– Creates the resistance form to hold gutta-percha in the canal.
• Avoid transportation of the foramen.
• Keep the apical opening as small as possible.
Biological objectives:
– To remove the pulp tissue
– Bacteria and their by-products from the root canal space.
6. DIFFERENT MOVEMENTS OF INSTRUMENTS
Reaming: it is commonly done by use of reamers , though files can
also be used. It involves clockwise rotation of an instrument.
Filing: the term filing indicates push-pull motion with the
instrument(file)
6
7. Combination of Reaming and Filing
• In this technique file is inserted with a quarter turn clockwise and
apically directed pressure (i.e. reaming) and then is subsequently
withdrawn (i.e. filing).
Balanced Force Technique
• This technique involves oscillation of instrument right and left
with different arcs in either direction
7
8. BASIC PRINCIPLES OF CANAL INSTRUMENTATION
There should be a straight line access to the canal orifices
canal must always be prepared in wet environment.
Preparation of canal should be completed while retaining its
original form and the shape .
Exploration of the orifice is always done with smaller file to
gauge the canal size and the configuration
8
9. Canal enlargement should be done by using instruments in the
sequential order without skipping sizes.
After each insertion and removal of the file, its flutes should be
cleaned and inspected
Recapitulation is regularly done to loosen debris by returning to
working length. The canal walls should not be enlarged during
recapitulation.
Over preparation and too aggressive over enlargement of the
curved canals should be avoided
9
11. STEP BACK TECHNIQUE
• also known as Telescopic canal preparation or serial root canal
preparation
• emphasizes keeping the apical preparation small, in its original
position and producing a gradual taper coronally
• In this technique apical portion is instrumented first and then
progress toward coronal
• This instrumentation technique form apical stop and there by
avoids irritation of the periapical tissues by medicaments or
filling material.
• because there is very little canal enlargement and removal of
dentin near the apex,the danger of perforation is reduced
11
12. • After the access opening is made, the working length is
determined on a measuremnt radiograph
• The first file that binds in the canal at the working length is
considered as initial apical file(IAF)
• Starting with the IAF, the root canal is enlarged to working length
through four file sizes
• For large canals- minimum MAF #40-50
• For small canals – minimum MAF # 35-40
12
13. • The master apical file (MAF) is by definition the largest file that
binds slightly at the corrected working length.
• The MAF is determined by passively placing successively larger
files at the correct working length until a size is reached that
slightly binds at the tip
• After the root canal has been enlarged throughout its entire
length to the size of MAF
• The subsequent files are each made 1mm shorter than the
previous file
13
23. Recapitulation
• This accomplished, after each successively larger file, by
irrigating and the returning to a file smaller than the file which
prepared the apical portion of the canal
Irrigation
• Is used between each file also to remove debris
• Failure to recapitulate will result in canal blokage
23
24.
25. Advantage of Step Back Technique
• More flare at coronal part of root canal with proper apical stop
Disadvantages of Step Back Technique
• Difficult to irrigate apical region
• More chances of pushing debris periapically.
• Time consuming.
• Increased chances of iatrogenic errors for example ledge
formation in curved canals
• Difficult to penetrate instruments in canal so there is More
chances of instrument fracture
26. Crown Down Preparation
In the crown down technique, the
dentist prepares the canal
from crown of the tooth, shaping the
canal as he/she moves towards the
apical portion of the canal
27. Technique of Crown Down Preparation
• First step in the crown down technique is the access cavity
preparation with no pulp chamber obstructions.
• Locate the canal orifices with sharp explorer
• Now fill the access cavity with an irrigant and start preflaring of
the canal orifices by using Gates-Glidden drills or the nickle-
titanium rotary instruments.
• Gates-Glidden drills can be used after scouting the canal orifices
with number 10 or 15 files.
• The crown down approach begins with larger Gates-Glidden first
• Frequent irrigation with sodium hypochlorite and recapitulation
with a smaller file (usually No. 10 file) to prevent canal blockage
28. Use of Gates-Glidden for preflaring
Coke-bottle appearance” caused by
excessive use of Gates-Glidden drills
29. • After establishing coronal and mid root enlargement explore
the canal and establish the working length with small instruments
• Introduce larger files to coronal part of the canal and prepare it.
Smaller number files deeper into the canal in sequential order
and prepare the apical part of the canal
• Final apical preparation is prepared and finished along with
frequent irrigation of the canal system
32. Advantage of crown down
• Removal of tissue debris coronally, thus minimizing the
extrusion of debris periapically.
• Reduction of postoperative sensitivity which could result
from periapical extrusion of debris.
• Greater volumes of irrigants can reach in canal irregularities
because of coronal flaring.
• Rapid removal of contaminated and infected tissues from
the root canal system.
33. 33
Reference
• Textbook of Endodontics - Jaypee Brothers; 2nd edition (26 Nov
2010)
• Endodontics principles and practice 5th edition
Editor's Notes
Apical portion is instrumented first & an Apical matrix?? or stop is formed to avoid canal perforation & irritation of periapical region.
Adv- better debridement, savings in operator time.