Laboratory evaluation of phosphate ester bonding agents

Area of Science:

• Dental Materials Science
• Adhesive Dentistry
• Biomaterials Engineering

Background:

• Introduction of novel dentin bonding agents containing phosphorus esters.
• Assessment of bonding capabilities to diverse substrates including enamel, dentin, amalgam, cast metal alloys, and porcelain.
• Evaluation of microleakage in Class V restorations.

Purpose of the Study:

• To determine the shear bond strengths of Clearfil Photo Bond, Panavia, and Clearfil Porcelain Bond to various dental substrates.
• To quantify the microleakage of Class V restorations using these bonding agents.
• To assess the clinical applicability of these new bonding agents.

Main Methods:

• Determination of shear bond strengths to enamel, dentin, amalgam, amalgam-dentin, cast metal alloy, and porcelain.
• Quantitative microleakage evaluation of Class V restorations in cementum (dentin).
• Application of bonding agents according to manufacturer's instructions with a light-cured resin composite.

Main Results:

• Mean shear bond strengths (MPa): Enamel (A) = 24.15 ± 3.65, Dentin (B) = 11.30 ± 3.12, Amalgam (C) = 13.77 ± 3.42, Amalgam-Dentin (D) = 4.26 ± 0.92, Cast Metal Alloy (E) = 17.84 ± 3.19, Porcelain (F) = 13.45 ± 4.12.
• Quantitative microleakage (G) was 0.55 ± 0.34 mg dye/restoration.
• Varied bond strengths observed across different substrates.

Conclusions:

• The evaluated phosphorus ester-containing dentin bonding agents demonstrate varying degrees of bond strength to different dental materials.
• Low microleakage suggests potential for durable restorations.
• Further clinical evaluation is warranted to confirm long-term efficacy.