Download - Class III cavity preparation
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Equipment and materials used in class 3 cavity preparation
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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
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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
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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
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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.
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Principles for class 3 Cavity prep.
Shaft of bur should not be parallel to proximal plane
Access through labial embrasure
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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