Dentin permeability: self-etching and one-bottle dentin bonding systems.

Area of Science:

• Dental Materials Science
• Adhesive Dentistry
• Biomaterials

Background:

• Numerous dentin bonding systems exist, varying in application mechanisms and effectiveness.
• Understanding the sealing capabilities of these systems is crucial for clinical success.
• This study evaluates dentin bonding systems with and without prior acid etching.

Purpose of the Study:

• To measure the microfiltration of saline solution across dentin after applying self-etching and one-bottle dentin bonding systems.
• To compare the sealing efficacy of different dentin bonding agents.

Main Methods:

• Thirty-six human third molars were sectioned into dentin disks.
• Six groups of dentin disks were treated with different bonding systems (Optibond Solo Plus, Excite, Prime & Bond NT, Single Bond, Clearfil SE Bond, Prompt L-Pop).
• Hydraulic conductance was measured using the Flodec apparatus after phosphoric acid etching and bonding agent application.

Main Results:

• Four conventional etching systems (Optibond Solo Plus, Single Bond, Excite, Prime & Bond NT) demonstrated a significant reduction in fluid penetration (around 40%).
• Self-etching systems showed less reduction: Clearfil SE Bond (36%) and Prompt L-Pop (16%).
• Standard deviations were high, indicating variability, except for Single Bond and Prime & Bond NT.

Conclusions:

• Conventional etching dentin bonding systems provided a greater decrease in dentin permeability compared to the tested self-etching systems.
• The difference was statistically significant for Prompt L-Pop but not for Clearfil SE Bond.
• Clinicians should consider these findings when selecting dentin bonding agents for optimal sealing.