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