Evaluation paste removal method and bond strength between resin cement and lithium disilicate ceramic: An in vitro...

Area of Science:

• Dental Materials Science
• Ceramic Restorations
• Adhesive Dentistry

Background:

• Evaluation paste residue can compromise bonding surfaces.
• The impact of residue on lithium disilicate ceramic adhesion is not well understood.

Purpose of the Study:

• To evaluate the efficacy of different cleaning methods for lithium disilicate ceramic after contamination with evaluation paste.
• To assess the impact of cleaning on resin cement bond strength before cement application.

Main Methods:

• Lithium disilicate specimens were contaminated with evaluation paste.
• Tested cleaning methods included air-water spray, 37% phosphoric acid, ultrasonic bath, cleaning paste, and hydrofluoric acid.
• Microshear bond strength was tested at baseline and after aging; surface analysis (SEM, EDS) was also performed.

Main Results:

• Air-water spray and cleaning paste failed to fully restore bond strength after aging.
• 37% phosphoric acid, ultrasonic bath, and hydrofluoric acid treatments maintained bond strength comparable to controls.
• EDS and SEM confirmed residual contamination in air-water spray and ultrasonic bath groups.

Conclusions:

• Effective cleaning of lithium disilicate ceramic is essential after evaluation paste use.
• 37% phosphoric acid, ultrasonic bath, and hydrofluoric acid are recommended for optimal resin cement bonding.
• Air-water spray and cleaning paste are less effective in removing contaminants for durable adhesion.