1. High-efficiency etching capability
Rapid demineralization: A 37% concentration can effectively dissolve hydroxyapatite in enamel within 15–30 seconds, forming a microporous structure (5–50 μm deep), significantly increasing the bonding surface area.
Uniform etching: Forms a standard "honeycomb-like" rough surface (especially on enamel), enhancing the micro-mechanical retention of resin adhesives.
2. Maximized bonding strength
Ideal choice for enamel bonding: After acid etching, resin penetrates deeply into enamel micro-pores, achieving bonding strength of 20–30 MPa, far exceeding untreated enamel.
Excellent compatibility with composite resins: Provides optimal wetting and penetration for light-cured resins, reducing marginal microleakage.
3. Precise controllability
Flexible time adjustment:
Enamel: Recommended 15–30 seconds (permanent enamel typically 30 seconds; primary teeth or fluorosis-affected teeth may be shortened).
Dentin: Recommended ≤15 seconds (to avoid excessive demineralization causing collagen fiber collapse).
Gel formulation advantages: Most products are gel-based, making them easy to confine to the target area and preventing unintended acid etching caused by liquid flow.
4. User-friendly operation
Immediate rinsing stops the reaction: Rinsing with water for 5-10 seconds completely removes the acid etchant, halting the demineralization process, ensuring safe and controllable operation.
Compatible with multiple bonding systems: Suitable for total-etch bonding techniques (e.g., "etch-and-rinse" technique) and compatible with most dental adhesives (e.g., fifth and sixth generations).
5. Stable clinical outcomes
Long-term durability: The resin-to-dentin interface exhibits high long-term stability after etching, reducing the risk of restoration detachment.
Reduced post-operative sensitivity (when used appropriately): Precise control of dentin etching time avoids excessive opening of dentin tubules, lowering the incidence of post-operative sensitivity.
6. High safety
Short-term contact is harmless: Minimal pulp irritation when used correctly (safe when dentin thickness remains >0.5mm).
Low residual risk: No acidic residues remain after thorough rinsing, ensuring no interference with subsequent bonding.