PRINCIPLES OF CAVITY PREPARATION

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1. GREENE VARDIMAN - GV BLACK

   • 1896 he classified cavity preparations
     • 1908 - invented the 1st foot drill, used nitrous oxide, "extension is prevention"

2. BLACKS CLASSIFICATION

   • Class I - occlusal surfaces of molars and premolars and buccal pits
     • Class II - approximal surfaces of molars and premolars
       • Class III - approximal surfaces of incisors and canines
         • Class IV - Incical edges of incisors and canines
           • Class V - Cervical margins

3. DISADVANTAGES

   • Used before adhesive materials were available
     • Retentive cavities were cut
     • Removes more tooth sub than necessary
       • Does not include root or secondary caries
         • Cavities are now modified versions of Blacks

4. BLACKS PRINCIPLES TO CAVITY PREPARARTION

   • OUTLINE FORM - gain access to caries
     • RESISTANCE FORM - cavity floor at right angle to withstand occ forces
       • RETENTION FORM - grooves in cavity walls, undercuts, bonding agents
         • TREATMENT OF RESIDUAL CARIES - remove soft infected dentine, leave hard stained dentine
         • CORRECTION OF ENAMEL MARGINS - remove weakened enamel edges, bevel edges
         • CAVITY DEBRIDEMENT - cavity thouroughly washed and dried to remove debris and bacteria

5. LINE ANGLE - where 2 lines meet

   • CAVOSURFACE ANGLE - where cavity wall meets tooth surface
     • POINT ANGLE - where 3 or more lines meet

6. STAGES IN CAVITY PREPERATION

   • Gain access to the caries (outline form)
     • Remove the caries - ADJ then infected but not affected
       • Look, think, design
         • Complete the preperation