Wet bonding: effect of drying time and distance

Area of Science:

• Dental Materials Science
• Adhesive Dentistry

Background:

• Dentin adhesives require specific surface moisture for optimal bonding.
• Improper drying techniques can compromise the integrity of the dentin-tooth interface.

Purpose of the Study:

• To investigate how varying drying times and air-water syringe distances affect the shear bond strength of a dentin adhesive.
• To determine the optimal drying parameters for a dentin adhesive that relies on a moist surface.

Main Methods:

• Seventy extracted human molars were acid-etched and rinsed.
• Dentin surfaces were dried using compressed air for 1, 3, or 5 seconds at distances of 1 cm or 10 cm.
• A specific dentin adhesive (One-Step) was applied, followed by composite cylinder placement and shear bond strength testing.

Main Results:

• Both drying time and syringe-to-tooth distance significantly influenced shear bond strengths.
• Extended drying times and shorter distances between the air syringe and tooth surface resulted in reduced bond strengths.
• These findings indicate a critical interplay between drying parameters and adhesive efficacy.

Conclusions:

• Excessive drying or insufficient distance from the air source can compromise dentin adhesive bond strength.
• Clinicians should carefully control drying time and air syringe distance to ensure optimal performance of wet-bonding adhesives.
• Further research may explore specific protocols for different adhesive systems.