PRINCIPLES OF CAVITY PREPARATION

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GREENE VARDIMAN - GV BLACK
1. 1896 he classified cavity preparations
  1. 1908 - invented the 1st foot drill, used nitrous oxide, "extension is prevention"
BLACKS CLASSIFICATION
1. Class I - occlusal surfaces of molars and premolars and buccal pits
  1. Class II - approximal surfaces of molars and premolars
    1. Class III - approximal surfaces of incisors and canines
      1. Class IV - Incical edges of incisors and canines
        Class V - Cervical margins
DISADVANTAGES
1. Used before adhesive materials were available
  1. Retentive cavities were cut
  2. Removes more tooth sub than necessary
    1. Does not include root or secondary caries
      1. Cavities are now modified versions of Blacks
BLACKS PRINCIPLES TO CAVITY PREPARARTION
1. OUTLINE FORM - gain access to caries
  1. RESISTANCE FORM - cavity floor at right angle to withstand occ forces
    1. RETENTION FORM - grooves in cavity walls, undercuts, bonding agents
      1. TREATMENT OF RESIDUAL CARIES - remove soft infected dentine, leave hard stained dentine
      2. CORRECTION OF ENAMEL MARGINS - remove weakened enamel edges, bevel edges
      3. CAVITY DEBRIDEMENT - cavity thouroughly washed and dried to remove debris and bacteria
LINE ANGLE - where 2 lines meet
1. CAVOSURFACE ANGLE - where cavity wall meets tooth surface
  1. POINT ANGLE - where 3 or more lines meet
STAGES IN CAVITY PREPERATION
1. Gain access to the caries (outline form)
  1. Remove the caries - ADJ then infected but not affected
    1. Look, think, design
      1. Complete the preperation

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PRINCIPLES OF CAVITY PREPARATION

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