CLASS I CAVITIES

¨Due to narrow occlusal table isthmus should not be more than 1/3^rd the intercuspal distance in the case of small carious lesion

¨The depth should not be more

 than 0.5 mm into the dentin

MODIFICATION OF CAVITY PREPARATION IN PRIMARY TEETH

   Factors to be considered while restoring primary teeth

§The smaller tooth dimension of the deciduous dentition

§The thin enamel covering the teeth

§Broad contact area

§Proximity of the pulp chamber

§Narrow occlusal table

RECENT CONCEPT

            PRINCIPLES OF RECENT CONCEPT 

    ¨Cavity design should be dictated under the site and extent of the lesion

    ¨Should not be in expectation of extending cavity out to the “caries free” area.         

    ¨Restorative material should be one that displays some degree of biological activity

FINAL PROCEDURE

¨It include removing all chips and lose debris that have accumulated ,drying the preparation and making a final complete inspection of the preparation for any remaining infected dentin or any condition that renders the preparation unacceptable to receive the restorative material.

FINISHING EXTERNAL WALLS AND MARGINS

¨It is the further development when indicated of a specific cavosurface design and degree of smoothness  that produces maximum effectiveness of the restorative material used.

SECONDARY RESISTANCE AND RETENTION FORM

¨Many preparation require additional retentive features .When the tooth preparation include both occlusal and proximal surfaces each of those area should have independent retention and resistance features

PULP PROTECTION

   ¨It is the step in adapting the preparation for receiving the final restorative material

   ¨Liners or bases is used to protect the pulp or to aid pulpal recovery