A comparative study of three dental adhesives

Area of Science:

• Dental Materials Science
• Biomaterials Engineering
• Adhesive Dentistry

Background:

• Dental adhesives are crucial for bonding restorative materials to tooth structure and alloys.
• Evaluating the shear bond strength and reliability of different adhesives is essential for clinical success.
• Dentine depth can influence the bond strength of certain dental adhesive systems.

Purpose of the Study:

• To compare the shear bond strengths of three dental adhesives (All-Bond 2, Scotchbond 2, Panavia Ex) to dentine and a Nickel-Chromium-Beryllium (NiCrBe) alloy.
• To assess the reliability and dentine depth dependency of these adhesive systems.
• To determine the bond strengths of the adhesives when bonding alloy to alloy.

Main Methods:

• Shear bond strength testing was performed on human third molar teeth and NiCrBe alloy specimens.
• Adhesives were applied to superficial dentine and alloy discs, with dentine bond tests conducted at varying depths.
• Statistical analysis included ANOVA and Weibull analysis to evaluate bond strength and reliability.

Main Results:

• All-Bond 2 exhibited significantly higher and more reliable bond strengths to dentine than Scotchbond 2 and Panavia Ex.
• The bond strength of Scotchbond 2 and Panavia Ex to dentine was influenced by dentine depth.
• All-Bond 2's bond strength to dentine was independent of dentine depth.
• Panavia Ex demonstrated significantly greater alloy-to-alloy bond strengths compared to All-Bond 2.

Conclusions:

• All-Bond 2 is a highly effective dental adhesive for dentine, offering consistent performance across different depths.
• Scotchbond 2 and Panavia Ex show variable bond strengths to dentine depending on depth, suggesting limitations in deeper regions.
• Panavia Ex is a suitable choice for bonding NiCrBe alloys, outperforming All-Bond 2 in this specific application.