In cavity preparation, the width of the cavity is:
a- 1/2 inter cuspal distance.
b- 1/3 inter cuspal distance. ***
THE PREPARATION OF THE ENDODONTIC ACCESS CAVITY:
EAC is defined as a cavity carved in the dentine whose walls are the coronal extension of the walls of the pulp chamber and the bottom corresponds to the ceiling of the pulp chamber.
The preparation objectives of the EAC:
During the preparation, we will have to look for:
the visibility of the entrances of the canal openings.
- the most direct access possible to the channels up to the apical limit without occlusive interference.
- the complete removal of dentine or pulp debris from the pulp chamber.
- Effective irrigation of the canal system.
- the easy passage of the canal instruments.
-the holding of the temporary dressing and therefore tightness of the EAC during the inter sessions.
The general principles of preparation:
Adherence to these principles will determine the success of endodontic treatment as a whole.
- know the anatomy of the tooth treated.
- establish an accurate diagnosis and a treatment plan.
-prepare the tooth itself for the procedure: complete elimination of caries and any defective restorations that may hinder the passage of instruments.
knowledge of anatomy:
This is one of the main objectives of the realization of the EAC and precisely access to the canal system as a whole, each tooth has roots and channels whose number and configuration are mainly typical.
A radiograph is essential to know the particular anatomy of the tooth, finally the direct clinical examination of the tooth gives information on the state of the crown and the preliminary stages to realize, from the one can determine the localization and the shape of the EAC.
the location of the CAE:
It must be located in the axis of the channel (s), the shape of the contour must be identical to that of the pulp floor:
For the anterior teeth, the projection of the canal axis passes through the incisal edge so the cavity will be made on the palatal or lingual face.
For posterior teeth the CAE will be performed on the occlusal surface.
the shape of the outline:
It must correspond to the pulpal anatomy of each tooth and be related to the morphology of the pulpal floor. Thus we will have oval and rounded forms on the mono-root and for multi-root the shape is triangular or trapezoidal.
the general shape of the vertical walls:
Create divergent funnel-shaped walls open towards the occlusal surface so as to eliminate any obstacle, against the pulp ceiling and provide direct visual access to the canal instruments.
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