Comparison of polymerization shrinkage of a new bulk‐fill flowable composite with other composites: An in vitro study

Abstract

Objective: Since composites still face a critical problem called polymerization shrinkage and bulk-fill composites have reported acceptable results for this issue, this study aims to assess the polymerization shrinkage of a new bulk-fill flowable composite (G-aenial bulk injectable [GBI]) and compare it to other bulk-fill and conventional composites. Materials and Methods:In this in vitro study, 25 composite discs were fabricated using three bulk-fill and two conventional composites. They were bonded to a microscopic slide and were covered by a coverslip. This assembly was transferred to a linear variable differential transformer and composite samples were cured from underneath the slides. Dimensional changes formed in composite samples were recorded. Data were analyzed using analysis of variance followed by post hoc Tukey's and Dunnett's tests. Results:The groups were significantly different regarding polymerization shrinkage.G-aenial bulk injectable and G-aenial universal flo showed significantly higher polymerization shrinkage than other composites at 30, 60, and 1800 s after light irradiation, while X-tra fil and Filtek Z250 showed the lowest polymerization shrinkage at the aforementioned time points. Conclusion:According to the results, the new composite had polymerization shrinkage similar to the conventional one. Bulk-fill composites reported similar or lower shrinkage to conventional composites.

Clinical performance of different bulk‐fill composite resin systems in class II cavities: A 2‐year randomized clinical trial

“…Undoubtedly, bulk‐fill composite pre‐heating decreases its viscosity, which consequently improves its marginal and internal adaptation, and that has been the case since time immemorial 42–46,52 . In addition, the low viscosity of G‐ænial™ BULK injectable justifies its marginal adaptation superiority, making it practical, especially in small cavities 19 …”

Bulk-Fill Resins versus Conventional Resins: An Umbrella Review

“…This is due to the differences in the composition of the two types of bulk-fill resin. While the flowable bulk-fill resins, which belong to the bulk-fill resins initially used, present greater translucency and a smaller concentration and size of the filler particles, resulting in a more fluid composite resin, full-body bulk-fill resins have been developed and synthesised through the use of new types of monomers, filler particles and photo initiator systems, creating a composite resin with similar shrinkage to conventional resins [ 48 , 49 , 50 , 51 , 52 ]. Another characteristic related to volumetric shrinkage is polymerisation stress.…”

The germicidal effect, biosafety and mechanical properties of antibacterial resin composite in cavity filling

“…In addition, the activity of a large number of monomers decreases after they are polymerized into a network. Therefore, the volume of resin will decrease after monomer polymerization [ 76 , 77 ]. This phenomenon is known as polymerization shrinkage.…”