1

Preparation Of Curved RootCanal

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7

Circular filing

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Anti curvature filing

Endo 11

8

Perforations in access cavity prep

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9

Strip perforation

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Procedural error

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Procedural error

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Procedural error

Dentine mud

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Ledge Elbow

Endo 11

Perforation Strip perforation

12

Zipping

When a curved foramen is filedwith a small file with pressureagainst the outer side of thecurvature, repeated filing Zips andtransport the foramen.The curved area of the foramen isnot cleaned and retains tissuedebris.Foramen cannot be obturatedtotally andfailure of the RCT is certain.

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Non-vital posterior tooth

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Initial access Access to the pulp

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Withdrawal actionSmoothening walls

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Orifice enlargement

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Remove interferences Uses of gates bur

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Preparation of coronal two third

Number 3 Gates burNumber 2 Gates burNumber 1 Gates bur

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Direct line access Anti--curvature filing

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Apical instrumentation Completed preparation

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