Enhancing dentin bonding quality through Acetone wet-bonding technique: a promising approach

Area of Science:

• Dental Materials Science
• Biomaterials Engineering
• Adhesive Dentistry

Background:

• Dentin bonding is crucial for the longevity of dental restorations.
• Ensuring durable adhesion requires optimizing the interaction between dental adhesives and dentin.
• Residual water and collagen degradation can compromise the hybrid layer integrity.

Purpose of the Study:

• To evaluate the impact of the acetone wet-bonding (AWB) technique on dentin bonding.
• To investigate the mechanisms underlying AWB's effect on dentin bond durability.
• To assess AWB's influence on microtensile bond strength, nanoleakage, and interface properties.

Main Methods:

• Caries-free human molars were prepared and divided into water wet-bonding (WWB), ethanol wet-bonding (EWB), 50% acetone wet-bonding (50%AWB), and 100% acetone wet-bonding (AWB) groups.
• Singlebond universal adhesive was applied, followed by composite buildups.
• Microtensile bond strength (MTBS), failure modes, nanoleakage, in situ zymography, and contact angle were assessed after various storage and aging conditions.

Main Results:

• AWB significantly preserved MTBS after thermocycling and collagenase aging, without compromising immediate bond strength.
• The AWB group exhibited reduced nanoleakage compared to the WWB group.
• AWB decreased dentin surface contact angle and suppressed collagenolytic activity in the hybrid layer.

Conclusions:

• The AWB technique enhances dentin bond durability by increasing dentin wettability and adhesive monomer penetration.
• AWB effectively removes residual water and inhibits collagen degradation within the hybrid layer.
• This technique holds potential for increasing the lifespan of adhesive dental restorations.