In the ever-evolving landscape of dental material science, the quest for superior dental restorative composites has led to significant advancements aimed at overcoming the limitations of traditional materials. One of the most promising developments in this field is the integration of an innovative elastomeric monomer, Exothane 24, into bulk-fill composites (BFCs). This groundbreaking research that we have published in Dental Materials in 2022 not only characterizes the chemical structure of Exothane 24 but also meticulously evaluates its impact on the mechanical properties and wear resistance of dental BFCs.
Exothane 24, chemically known as a urethane isophorone tetramethyl methacrylate monomer, distinguishes itself through a unique molecular structure characterized by higher molecular weight and an aliphatic cyclic backbone. This structural configuration imparts the monomer with exceptional properties, notably in mitigating polymerization shrinkage stress (PSS) and enhancing the wear resistance of BFCs. Through rigorous analysis employing mass spectroscopy, elemental analysis, and nuclear magnetic resonance (NMR), the study provides a comprehensive elucidation of Exothane 24's molecular identity, setting the stage for its application in dental composite formulations.
The investigation extends to formulating BFCs incorporating varying concentrations of Exothane 24, meticulously assessing their degree of conversion, flexural strength, modulus, Vickers hardness, and notably, their two-body wear resistance. The findings reveal that BFCs formulated with Exothane 24 exhibit a balanced profile of mechanical properties and wear resistance, underscoring the monomer's potential to revolutionize dental restorative materials. Notably, composites containing Exothane 24 demonstrate a significant reduction in PSS, a critical factor in enhancing the longevity and integrity of dental restorations.
More recently, one major dental manufacturer announced the pioneering use of Tetramethacrylates in Kuraray's Clearfil Quick Bond 2, marking a milestone in the application of urethane tetramethacrylate technology in dental adhesives. This innovation underscores the monomer's role in improving the mechanical properties of dental materials, thereby paving the way for more durable and reliable dental restorations.
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