Thursday 31 May 2012



CLASS III CAVITIES
¨When the contact is open the outline is triangular with base towards the gingival aspect of the cavity
¨Gingival cavity wall is inclined occlusally to parallel the enamel rod direction

CLASS II CAVITIES
¨Due to presence of broad contact area, the gingival floor of the proximal box should be wide
¨The box should converge occlusally with the buccal and lingual wall paralleling the external tooth surface .the walls of proximal box should meet the occlusal wall in a straight line

Wednesday 30 May 2012


CLASS I CAVITIES
¨Due to narrow occlusal table isthmus should not be more than 1/3rd 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

Tuesday 29 May 2012

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

Monday 28 May 2012

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.

Sunday 27 May 2012

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.

Saturday 26 May 2012

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

Friday 25 May 2012

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

Thursday 24 May 2012

REMOVING OF ANY REMAINING INFECTED DENTIN



¨This is the elimination of any infected carious tooth structure or  faulty restorative material that is left in the tooth after tooth preparation

Wednesday 23 May 2012

CONVENIENCE FORM



¨It is that shape or form of the cavity that provide for adequate observation  accessibility and ease of operation in preparing and restoring the tooth.

Tuesday 22 May 2012

PRIMARY RETNTION FORM


   ¨It is that shape or form of tooth preparation that resist displacement or removal of restoration from tipping or lifting force .
    ¨Occlusal dovetail prevents tipping of the restoration by occlusal forces.

PRIMARY RESISTANCE FORM


    This is that shape and placement of cavity walls that best enables both the restoration and tooth to withstand without fracture the masticatory forces delivered principally along the long axis of the tooth.

Sunday 20 May 2012


STURDEVANT’S CLASSIFICATION
 ¨SIMPLE CAVITY: a cavity involving only one tooth surface
 ¨COMPOUND CAVITY: a cavity involving two surfaces of a tooth
 ¨COMPLEX CAVITY: a cavity that involves more than two surfaces of a tooth.

Saturday 19 May 2012



CHARBENEU’S MODIFICATION
¨CLASS II: cavities on single proximal surface of bicuspid and molars.
¨CLASS VI: cavities on both mesial and distal proximal surfaces of posterior teeth that will share a common occlusal isthmus

Friday 18 May 2012



FINNS MODIFICATION
¨CLASS I: Pit and fissure cavities on the occlusal surface of molars and buccal and lingual pits of all teeth .
¨CLASS II:Cavities on proximal surface of posterior teeth with access established from occlusal surface

Wednesday 16 May 2012

CLASSIFICATION OF CAVITY PREPARATIONS



BLACKS CLASSIFICATION
¨CLASS I:All pit and fissure lesion on occlusal surface of premolars and molars, lesion on occlusal 2/3rd of the facial and lingual surface of molars and lesion on lingual surface of maxillary incisor 

¨CLASS II:Lesion on proximal surface of posterior teeth
¨CLASS III :Lesion on proximal surface of anterior teeth that do not involve incisal edge
¨CLASS IV :Lesion on proximal surface of anterior involving  incisal edge
¨CLASS V :Lesion on gingival third of facial or lingual of all teeth
¨CLASS VI :Lesion on incisal edge of anterior teeth or occlusal cusp tip of posterior teeth 

CAVITY PREPARATION


A cavity in the  dentistry is defined as ‘a defect in enamel, detin or cementum resulting from the pathological processes, mostly  the dental caries’.Other processes such as abrasion, erosion etc.can also cause such defects    (SKIRI)

PRINCIPLES OF CAVITY PREPARATION & ITS MODIFICATIONS IN PRIMARY TEETH



INTRODUCTION
     DENTAL CARIES    
      ‘Infectious, microbiological disease  that results in localized dissolution and destruction of calcified tissues of the teeth.’ ( Sturdevant)
      Most restorative treatment was due to caries. The tooth was cavitated and was referred to as a cavity. when the affected tooth was repaired, the cutting or preparation of the remaining tooth structure was referred to as cavity preparation. 

it starts here


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