Question 593 · LDEK · Cavity preparation
Indicate the false statements regarding the preparation of carious lesions using air abrasion:
1) modern instruments for kinetic preparation of carious lesions use zirconium oxide molecules of size 20-50 microns;
2) air abrasion helps to effectively eliminate enamel and dentin, however, it does not eliminate composite fillings;
3) it is not recommended using air abrasion to prepare carious lesions in the region of a tooth neck due to the risk of damaging the gingival line;
4) following kinetic preparation of carious lesions, it is necessary to remove enamel by etching prior to application of a bonding system.
The correct answer is:
2) air abrasion helps to effectively eliminate enamel and dentin, however, it does not eliminate composite fillings;
3) it is not recommended using air abrasion to prepare carious lesions in the region of a tooth neck due to the risk of damaging the gingival line;
4) following kinetic preparation of carious lesions, it is necessary to remove enamel by etching prior to application of a bonding system.
The correct answer is:
- A. 1,2.
- B. 2,3.
- C. 3,4.
- D. 1,3.
- E. 2,4.
Hint
Recall the abrasive powder actually used in air abrasion units and whether the stream discriminates between tooth tissue and resin.
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