Equipment and materials used in class 3 cavity preparation

1. Equipment

Explorer: used to detect or explore the cavity

Radiographic machine (x-ray): too used to examine the decayed portion of tooth

Dental light: for examination

cont’

Round tungsten carbide bur or diamond :used with high speed handpiece

Gingival margin trimmer : used for smoothing the prepared cavity and too for trimming the composite after filling

Finishing bur

2. Materials

Resin composite: is used to improve the esthetic in anterior teeth

Resin modified glass ionomer materials – used for filling dental caries with margins extending onto the root surface

Steps for cavity preparation

Establish outline form – based on the location and extent of the carious lesion

Obtain resistance form – so that the restoration is resistant to displacement.

Obtain retention form - obtained by shaping the preparation or via bonding procedures that attach the restorative materials to the tooth structure.

Obtain convenience form- allows adequate observation, accessibility and ease of operation during preparation and restoration of the tooth.

Remove remaining carious dentin Finish enamel walls and cavo-surface margins- it involves

making the walls relatively smooth Clean the preparation- it includes washing and scrubbing

away any debris in the preparation and drying the preparation.

Principles for class 3 Cavity prep.

Shaft of bur should not be parallel to proximal plane

Access through labial embrasure

Principles for class 3 prep cont’

Center on gingival of contact area Extend lingually until contact is broken.

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Reference

Operative dentistry http://

student.ahc.umn.edu/dental/2012/6436/Cl3%20comp%20prep.09.pdf

http://collections.nlm.nih.gov/ext/dw/51030490R/PDF/51030490R.pdf