Microleakage of four composite resin systems in class II restorations

Abstract

Objective: To compare the microleakage at the enamel and dentine/cementum margins of three nanocomposites and a microhybrid composite in Class II restorations.

Materials and methods: Four light-cured dental resin restorative materials in combination with their respective bonding agents were investigated. Eighty non-carious, extracted human molars were divided into 4 groups of 20 teeth each. The apices of the teeth were sealed with a resin modified glass ionomer cement. Standardized Class II slot cavities were prepared on the proximal surfaces of each tooth. Each group had an equal number of cavities with gingival margins on enamel and on dentine/cementum. Restorations were placed as indicated: Group 1 (G1): Ceram-X mono/Prime & Bond NT (Dentsply), G2: Premise/ OptiBond Solo Plus (Kerr), G3: Grandio/Admira Bond (VOCO), G4: Z100/Adper Scotchbond Multi-Purpose (3M ESPE). After thermocycling and immersion in 0.5% methylene blue dye solution, the teeth were sectioned and dye penetration was scored on a scale of 0 to 3 on both the enamel and dentine/cementum margins. The data were analyzed using a Kruskal-Wallis one way ANOVA and Mann-Whitney U test of ranks (significance at p < 0.05).

Results: In the enamel group: Z100/Adper Scotchbond Multi-Purpose showed significantly higher leakage when compared to the other three groups (p < 0.05). In the dentine/cementum group: Grandio/Admira Bond showed significantly lower microleakage when compared to the other materials tested while Z100/Adper Scotchbond Multi-Purpose showed the largest microleakage (p < 0.05).

Conclusion: No material was able to eliminate microleakage completely at the dentine/cementum margin with Grandio/Admira Bond showing the least microleakage when compared to the other three materials tested. At the enamel margins, all materials tested performed reasonably well.