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| Question | Answer |
| GREENE VARDIMAN (GV) BLACK | 1896 - classified cavity preps |
| GV Black invented 1st drill | 1st use of nitrous oxide |
| "extension for prevention" | removed more tooth than needed |
| BLACKS CLASSIFICATION |
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| DISADVANTGES OF BLACKS CLASSIFICATION | before adhesive materials-retentive cavities, removes more tooth, does not include RC and 2nd caries! |
| CAVITY PREPARATION | Outline form:gain access to caries directly |
| RESISTANCE FORM:resistance to occ forces. Tooth structure and material withstand masticatory forces. | Cavity Floor at right angle to direction of forces. Good depth compatible with material |
| Enamel margins must be finished - un supporting enamel is prone to # | Adhesive restorations - does not require retentive/resistance form - is desirable as long as minimal prep is done |
| RETENTION FORM:grooves in cavity walls, use undercuts and occ keys, use of etch and bond materials | Retention only required for non-adhesive materials |
| TREATMENT OF RESIDUAL CARIES:always remove from EDJ first, then base of cavity | SOFT DENTINE is infected and should be removed, FIRM but stained dentine in cavity can be left |
| In ANTERIOR teeth stained dentine may be removed for aesthetic reasons. Preserve oblique ridge where poss | Use Slow speed HP with small rose head bur, then hand excavator |
| CORRECTION OF ENAMEL MARGINS:unsupported enamel is prone to #. Remove weakend tooth if placing amalgam | Can be splinted to adhesive material. If placing comp bevel edges to increase surface bonding |
| CAVITY DEBRIDEMENT: Cavity should be thoroughly washed and dried to remove any debris and bacteria | Use 3in1 syringe |
| CAVITY PREP FEATURES:box prep, gingival floor, occ floor, pupo axial wall, dovetail occ lock (with isthmus), beveled angle | LINE ANGLE:Where to lines/surfaces meet. CAVOSURFACE ANGLE:where cavity wall meets tooth surface(crown) 90- 110 degree |
| POINT ANGLE: where 3 or more lines(surfaces) meet | STAGES IN CAVITY PREP: 1.gain access to caries (outline form), 2.remove the caries, 3.think look design!, 4.complete the restoration |
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