Prepared by : Ghadeer suwaimil

Access Cavity Preparation in :

Outline

Introduction.Access cavity.Objective of access cavity.Guidelines for Access Cavity Preparation.References

A clear understanding of the anatomy of human teeth

becomes an essential prerequisite for achieving the

objectives of access, through

cleaning, disinfection, and obturation of the pulp space.

In this presentation we have tried to describe the access

opening of maxillary lateral incisor .

Introduction

IntroductionAverage length of 21- 22 mm.

It has a single canal and a single apical foramen.

The canal form is usually Type I.

In young patients have two only pulp horn and is wider in labiopalatal dimension.

The canal is tapered and the apex is often curved generally in distal direction.

Access cavity

The access cavity preparation generally

refers to the part of the cavity from the occlusion table to the canal orifice .

Objective of Access cavity

Well designed access preparation isessential for a good endodontic result.

Without adequate access, instruments and material becomes difficult to handle properly in the highly complex and variable canal system.

So : Objective of Access cavity

To achieve a straight or direct line access to the apical foramen.

To locate all root canal orifice. To conserve sound tooth structure. Well prepared and correct access cavity allow complete

irrigation, shaping ,cleaning and quality obturation. Ideal access results in a straight entry into the canal

orifice, with the line angles forming a funnel that drops smoothly into the canal.

Guidelines for Access Cavity Preparation

1. Visualization of internal anatomy

because internal anatomy dictates access shape.

This require evaluation of angled

peri-apical radiograph , examination of

coronal and cervical tooth anatomy.

2 .Preparation of the access cavity is through The center of lingual surface in anatomic crown.

3 .round bur or tapered fissure bur is used to penetrate the enamel and slightly into the dentine

4. The bur is directed perpendicular to the lingual surface as the external outline opening is created.

5 . Penetration of the pulp chamber roof is continuing with the same round or tapered fissure bur, we change the angle of the bur from perpendicular to the lingual surface to parallel to the long axis of the tooth.until the roof of the pulp chamber is penetrated, frequently a drop-in effect is felt when the penetration occurs.

6. Once the pulp chamber has been penetrated, the remaining roof is removed by catching the end of a round bur under the lip of the dentin roof and cutting on the bur ‘s removal stroke.

7. Identification of All Canal Orifices

By endodontic explorer

8.Removal of lingual shoulder, orifice and coronal flaring

Once the orifice has been identified, the lingual shoulder is removed.

Lingual Shoulder-: this is the lingual shelf of dentin that extends from the cingulum to a point approximately 2mm apical to the orifice.

At the end :

9.Straight line access determination by

endodontic file

And

10 .Refinement and smoothing of restorating

margins.

References

http://www.nature.com/bdj/journal/v203/n3/pdf/bdj.2007.682.pdf

http://www.devosendo.nl/uploads/pdf/116_Guidelines%20for%20access%20cavity.pdf

http://www.iust.edu.sy/courses/-3-Access%20Cavity%20Preparation.pdf

Ghadeer hassan