06/14/2026
Over-drying etched dentin is one of the classic reasons etch-and-rinse dentin bonding is technique sensitive.
After phosphoric acid etching, the superficial dentin layer is demineralized, leaving an exposed collagen scaffold that must remain expanded for optimal resin infiltration. Excessive desiccation can cause collagen collapse, reduced resin infiltration, and a compromised hybrid layer.
A few important considerations:
- This concern is most relevant when dentin has been phosphoric-acid etched, as with etch-and-rinse adhesives or universal adhesives used in etch-and-rinse mode.
- Self-etch adhesives, or universal adhesives used with selective enamel etching, are generally less moisture-sensitive in this specific way because dentin is not separately etched with phosphoric acid.
- The goal is visibly moist dentin, not puddled water and not desiccated dentin.
- Postoperative sensitivity is multifactorial, but inadequate dentin sealing remains one possible contributor.
👉 Clinical tip: if etched dentin looks chalky, matte, or frosty white, it may be drier than you think.
References:
Popescu M, Malița M, Vorovenci A, Ștețiu AA, Perieanu VȘ, Costea RC, David M, Costea RM, Ștețiu MA, Drăguș AC, et al. Wet vs. Dry Dentin Bonding: A Systematic Review and Meta-Analysis of Adhesive Performance and Hybrid Layer Integrity. Oral. 2025; 5(3):63.
Kwon J, Kim J, Choi D, Kim DS. The Influence of Drying Time, Application Mode, and Agitation on the Dentin Bond Strength of a Novel Mesoporous Bioactive Glass-Containing Universal Dentin Adhesive. J Funct Biomater. 2025 Jul 5;16(7):247.
Bourgi R, Kharouf N, Cuevas-Suárez CE, Lukomska-Szymanska M, Haikel Y, Hardan L. A Literature Review of Adhesive Systems in Dentistry: Key Components and Their Clinical Applications. Applied Sciences. 2024; 14(18):8111.