PULP PROTECTION: Though not taken in principles of cavity preparation it is one of the important steps before final restoration. Pulpal injury can result due to: Heat generated by injudicious cutting. Restorative material with good thermal conductivity. Chemical from the restorative materials. Galvanic currents Microleakage. Liners and bases are used fro pulp protection. Liners are [...]
Removal of Remaining Carious Dentin or Old Restoration
June 29, 2009 By 1 Comment
REMOVAL OF REMAINING CARIOUS DENTIN OR OLD RESTORATIONS: It is the elimination of any infected carious tooth structure or faulty restorations left in the tooth after initial cavity preparation. Caries left in the pulpal/ axial floor is excavated thoroughly making the cavity deeper. 0.75- 1 mm of dentin should cover the pulp. All the infected/ [...]
Convenience Form in Cavity Preparation
June 29, 2009 By 1 Comment
CONVENIENCE FORM Definition: Convenience form is defined as that form of cavity preparation that allows adequate observation, accessibility and case of operation in preparing and restoring the cavity. Modification in tooth preparation for convenience form: Occlusal step in classII. Labial/lingual access for classIII/classIV. Occlusal divergence of cavity walls in cast restorations. INSTRUMENT MODIFICATION: Contra angling [...]
Steps to obtain proper Retention form in Cavity Preparation
June 29, 2009 By 1 Comment
RETENTION FORM: Retention form is that form of cavity that best permits the restoration to resist displacement through tipping or lifting forces, especially masticatory loading. PRINCIPAL MEANS OF GAINING RETENTION: Inverted truncated cones or undercuts. Dovetail. Elastic deformation of dentin e.g. gold foil. Friction – which depends on surface area, opposing walls or surfaces involved, [...]
Outline Form in cavity preparation
June 29, 2009 By 2 Comments
OUTLINE FORM: G .V. Black has described the outline form as being “the form of the area of the tooth surface to be included within the outline or enamel margins of the finished cavity”. It is the placement of cavity margins in the positions they will occupy in the final preparation, except for finishing enamel [...]
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