Laboratory evaluation of compomers in Class V restorations

Area of Science:

• Dental Materials Science
• Restorative Dentistry
• Biomaterials

Background:

• Compomer restorative materials offer an alternative to resin composites.
• Effective bonding systems are crucial for minimizing microleakage and ensuring restoration longevity.
• Understanding the interaction between compomers and bonding agents is vital for clinical success.

Purpose of the Study:

• To compare the in vitro microleakage, marginal integrity, and resin tag formation of a compomer (Dyract) with two bonding systems.
• To evaluate a hybrid resin composite (Prisma TPH) as a control material with two different bonding systems.
• To assess the efficacy of Dyract-PSA and Prime & Bond 2.0 when used with Dyract.

Main Methods:

• Class V restorations were fabricated in vitro using Dyract and Prisma TPH with specified bonding agents.
• Scanning Electron Microscopy (SEM) was used to analyze marginal alterations and resin tag configuration.
• Marginal and longitudinal microleakage was quantified using erythrosin B dye penetration.

Main Results:

• Prime & Bond 2.0/Dyract demonstrated the longest resin tags (up to 100 microns) and best dentin seal.
• Marginal and longitudinal leakage were observed in all groups at both dentin and enamel margins.
• Enamel marginal seals were comparable across different bonding systems, while dentin seals varied.

Conclusions:

• The combination of Prime & Bond 2.0 with Dyract offers superior dentin sealing compared to Dyract-PSA.
• While resin tag formation varied, microleakage remains a concern for both compomer and resin composite restorations.
• Further research is needed to correlate SEM observations with clinical outcomes regarding marginal integrity.