Fourth-generation dental adhesives, also called three-step bonding systems, involve which steps?

Correct answer: A. Etch, primer, bonding agent (3 separate steps) — the gold standard

• A. Correct. Fourth-generation adhesives use three discrete steps — separate etching, priming, and bonding agent application — and remain the clinical gold standard for bond strength.
• B. This describes a fifth-generation (2-step, total-etch) system.
• C. This describes a sixth-generation (2-step, self-etch) system.
• D. This describes a seventh-generation (1-step, all-in-one) system.

Note: Generation summary: 4th = 3 steps (etch+primer+bond) | 5th = 2 steps (etch+primer/bond together) | 6th = 2 steps (self-etch) | 7th = 1 step (all-in-one).