DOI: 10.4103/denthyp.denthyp_107_25 ISSN: 2155-8213
Effect of Reducing Dentinal Fluid Flow on the Dentin Bond Strength of Three Adhesives: An In Vitro Study
Benjapat Wongpaibool, Watcharaporn Kuphasuk, Pisol Senawongse, Vanthana Sattabanasuk, Choltacha Harnirattisai
Introduction:
We aimed to evaluate the immediate and long-term micro-tensile bond strength (μTBS) of three adhesive systems under simulated pulpal pressure (PP).
Methods:
Flat dentin surfaces were prepared from 72 extracted human third molars and assigned to three adhesive systems (
n
= 24): a 2-step etch-and-rinse, a 2-step self-etch, and a 1-step self-etch adhesive. Bonding and storage performed under 0 or 15 mmH₂O PP. Resin composite build-ups were placed, and μTBS was measured immediately, after 24 h, and after 3 months of water storage.
Results:
μTBS values at immediate and 3-month evaluations were lower than those at 24 h. Positive PP significantly reduced the immediate μTBS of the 1-step self-etch adhesive. Prolonged water storage decreased μTBS for all adhesives, whereas reduced dentinal fluid flow improved 3-month μTBS.
Conclusion:
Simulated PP and long-term water storage adversely affect dentin bonding. Reducing dentinal fluid flow during bonding enhances long-term bond durability.