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Curv ro

Department of Conservative Dentistry and

Dental Radiology

Presented by

Dr. Md. Nafizuzzaman Bhuiyan

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Introduction

A tooth with a straight root and a straightroot canal is an exception rather thanbeing normal because most teeth show

some curvature of the canal. Appropriate removal of pulpal tissues with

proper cleaning and shaping, followed byan obturation system and coronal seal, willsatisfy both mechanical and biologicalobjectives.

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Continues..

These curves cause a host of problems,including ledge formation, perforation,apical transportation, ip formation, and

!le separation. "o there are some techni#ues using in

curved canal preparation.

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Techni#ues using in curved canalpreparation

Apical to coronalapproach

$alanced forcetechni#ue

"tep bac%techni#ue

Circumferential!lling techni#ue

Coronal to apicalapproach

"tep downtechni#ue

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&igure' Curved root canal

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"tep bac% techni#ue

Also %nown as telescopic canal preparationor serial root canal preparation.

(t emphasies %eeping the apical

preparation small, in its original positionand producing a gradual taper coronally.

(t has two phase

)hase ( * )reparation of apical constriction.

)hase (( * )reparation of remaining canal.

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Phase I

i. +or%ing lengthestablished.

ii. otion watch

winding.iii.Apical

preparation uptothe !le no. - tofull length.

iv./ecaputulationusing prior sie

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Phase II

i. "tepping bac%procedure in 0mmincrements, 1o

- through 2.

ii. /ecapitulationwith a no -!le in fullwor%inglength.

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Refning Phase II-

A3ates 3liddendrills 1o. -,4,2used to prepare

coronal andmid rootportion.

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Refning Phase II-

B

i. /eturn to -last !le.

ii. "hort of wor%ing

length tosmooth the stepbac% withvertical push

pull stri%es5circumferential!lling6 by 7* !le.

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Completedpreparation

A continuous8owing 8aredpreparation

from the C*9junction to thecrown.

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"tep bac% techni#ue

Advantages'

a6 (t is designed to overcome instrumenttransportation in the apical 0:4 of the canal.

b6 Avoid ipping.

c6 (t can be used for the preparation of straightcanal.

d6 "uitable for slight to moderate curved canal.

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"tep bac% techni#ue

;isadvantages'

a6 Chances of pushing debris into peri*radiculartissues.

b6 ;i

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9xperimental study for the successrate of step bac% techni#ue

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Conclusion

"tep*bac% process creates a 8ared,tapering preparation while reducingprocedural errors.

The step*bac% preparation is superior tostandardied serial !ling and reamingtechni#ues in debridement andmaintaining the canal shape.

This techni#ue results in more pulpal wallsbeing planed when compared to reamingor !ling.

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/eferences

0. /ef'http'::dentistry.about.com:od:specialieddentistry:a:rootcanal

-. /ef ' (ngle=s endodontics thedition,4>page

4. /ef ' (ngle=s endodontics thedition,->page

2. /ef ' www.ijos.org.cn ? (nternational@ournal of ral "cience

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Than% you