Dentin Bonding Technique — ORE Part 1 MCQ
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Correct answer: E — Phosphoric acid etch → rinse → primer → adhesive (bond)
Explanation lettering: B = shown as A · D = shown as B · E = shown as C · C = shown as D · A = shown as E
Option A is correct. The total-etch (etch-and-rinse) technique requires: phosphoric acid etch → rinse → primer → adhesive. This three-step/four-clinical-step system first demineralises enamel and dentin with phosphoric acid, then removes all acid by rinsing and drying, allowing primer to infiltrate the exposed collagen-rich substrate. The hydrophobic adhesive is then applied to seal the interface and form resin tags. Options B, C, D, and E are incorrect because they disrupt this sequence: B and E apply primer before etching, preventing adequate demineralisation; C and D apply adhesive prematurely without proper priming; and D applies adhesive before rinsing, which contaminates the etched surface. This is a discriminating moderate-difficulty question requiring knowledge of bonding chemistry and clinical protocol order.
Reference: USPTO Patent 8466211 (2013) and supporting literature including clinical trial protocols (NCT00873990); consistent with SDCEP and UK dental teaching standards for etch-and-rinse bonding systems