The effect of application sustained seating pressure on adhesive luting procedure

Area of Science:

• Dental Materials Science
• Adhesive Dentistry
• Biomaterials Engineering

Background:

• Resin cements are crucial for dental restorations.
• Optimizing bond strength is essential for restoration longevity.
• Seating pressure and adhesive systems influence cement performance.

Purpose of the Study:

• To assess the impact of short (5s) versus long (3min) seating pressure on resin cement bond strength.
• To evaluate the effect of a hydrophobic light-cured adhesive (Clearfil Protect Bond) on bond strength.
• To compare luting with dual-cured resin cement (Panavia F) alone versus with the adhesive system.

Main Methods:

• Human third molars were divided into groups for different luting procedures.
• Cylindrical composite blocks were luted using Panavia F, with or without Clearfil Protect Bond.
• Seating pressure was applied for either 5 seconds or the full 3-minute polymerization period.
• Microtensile bond strength and SEM examination were performed after 24h storage.

Main Results:

• Using Clearfil Protect Bond with Panavia F resulted in significantly higher bond strengths than Panavia F alone (p<0.05).
• Extending seating pressure application to 3 minutes significantly increased bond strength (p<0.001).
• Sustained pressure application also improved the integrity of the interfacial quality.

Conclusions:

• Sustained seating pressure during luting enhances resin cement bond strength.
• The use of a hydrophobic light-cured adhesive (Clearfil Protect Bond) improves final bond strength.
• Combining sustained pressure and the adhesive system offers optimal bond strength for resin cements.