Raman Spectroscopic Assessment of Degree of Conversion of Bulk-Fill Resin Composites – Changes at 24 Hours Post Cure

Abstract

All bulk-fill composites presented a considerable 24-hour postcure DC increase and clinically acceptable DC at depths up to 4 mm. Conventional control composites were sufficiently cured only up to 2 mm, despite significant postcure polymerization.

Genotoxic potential of dental bulk-fill resin composites

“…The materials thus attained clinically acceptable levels of monomer conversion of > 55% [43]. In accordance with the current results, other studies using Raman or infrared spectroscopy also confirmed 4-mm depth of cure of flowable bulk-fill resin composites [17,44]. Moreover, in line with Czasch & Ilie [45], increasing irradiation time beyond 20 s did not further improve their degree of hardness.…”

Repair Bond Strength of Aged Resin Composite after Different Surface and Bonding Treatments

“…Additionally, the modified monomer bis-EMA (Ethoxylated bisphenol A dimethacrylate) has shown to increase the DC and decrease water sorption [29]. A mean 58.7% DC was measured 16 h after light curing in this study, which is within the range of values measured for this material in the literature [30,31]. An important increase in the DC was observed after 30 days water storage for the samples, with a mean value of 70.4%.…”

Mechanical properties, shrinkage stress, cuspal strain and fracture resistance of molars restored with bulk-fill composites and incremental filling technique

“…Meanwhile, their opacity is an advantage over other bulk-fill composites in terms of acceptable esthetics for placement in the visible zone, e.g., mesial class II restorations [10].…”