Question 151 (part 2) · LDEK · Prosthodontic materials
Total etch technique consists in:
- A. selective etching of enamel with 37% orthophosphoric acid for 30 sec.
- B. selective etching of enamel with 37% orthophosphoric acid for 10 sec.
- C. selective etching of enamel with 37% orthophosphoric acid for 30 sec, and dentin for 15sec.
- D. selective etching of enamel with 7% orthophosphoric acid for 30 sec.
- E. this technique is not used in prosthodontics.
Hint
Total-etch (etch-and-rinse) means both enamel and dentine are etched with phosphoric acid, each for a different time.
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