Marginal Microleakage of Composite Resin Materials Comprising Different Photo Initiators with Surface Sealants and Bonding Agent Application after Thermomechanical Aging
Aim: To evaluate both gingival and occlusal microleakage of Class II cavities restored with radical amplified photo polymerization (RAP) initiator technology™-based composite resin and camphor Quinone (CQ)-based bulk-fill composite resin and to compare application of two different surface sealant, one dentin bonding agent subsequent to finishing and polishing procedures performed after thermo-mechanical aging.
Materials and methods: Forty extracted, non-carious human third molars were selected. A total of eighty cavities were prepared on both mesio-occlusal and disto-occlusal surfaces of forty teeth. Forty cavities were restored with RAP technology™- based composite resin, Estelite Posterior (EP), other forty cavities were filled with CQ-based bulk-fill composite resin, Filtek Bulk Fill (FBF) then polymerized. After finishing and polishing procedures teeth were stored in distilled water, divided into four subgroups;BisCover LV Group(BC), Perma Seal Composite Sealer Group(PS), All-Bond Universal Group(ABU), Control Group(n=10 cavity for each group). Teeth were thermocycled, subjected to a chewing simulator. Later they were immersed in basic fusch in dye, first sectioned mesiodistally. A total of twenty surfaces were obtained from each group to evaluate gingival dye penetration. For the evaluation of occlusal dye penetration, these twenty surfaces were then sectioned buccolingually. Finally for each group forty surfaces (twenty surfaces for gingival and twenty surfaces for occlusal)were evaluated for dye penetration scores under a stereomicroscope. Statistical analysis was performed with Kruskal Wallis One-Way ANOVA (p<0.05).
Results: Statistical difference was detected between FBF Control and EP Control at both gingival and occlusal walls (p<0.05). No statistically significant differences were noted between FBF Control, FBF BC and FBF ABU groups at both gingival and occlusal walls (p>0.05). No significant differences were found between EP Control, EP BC and EP PS groups (p>0.05), while statistically significant difference between EP Control and EP ABU groups at both the gingival and occlusal walls (p<0.05).
Conclusion: Superiority of CQ-based bulk-fill to RAP technology TM-based composite resin was indicated in terms of microleakage. Composite surface sealants and dentin bonding agent succeeded in reducing marginal microleakage.