Abstract
In this study, a novel dental composite based on the unsaturated bismethylene spiroorthocarbonate expanding monomer 3,9-dimethylene-1,3,5,7-tetraoxa-spiro[5,5]undecane (BMSOC) and bisphenol-S-bis(3-meth acrylate-2-hydroxypropyl)ether (BisS-GMA) was prepared. CQ (camphorquinone) of 1 wt % and DMAEMA (2-(dimethylamino)ethyl methacrylate) of 2 wt % were used in a photoinitiation system to initiate the copolymerization of the matrix resins. Distilled water contact angle measurements were performed for the wettability measurement. Degree of conversion, volumetric shrinkage, contraction stress and compressive strength were measured using Fourier Transformation Infrared-FTIR spectroscopy, the AccuVol and a universal testing machine, respectively. Within the limitations of this study, it can be concluded that the resin composites modified by bismethylene spiroorthocarbonate and BisS-GMA showed a low volumetric shrinkage at 1.25% and a higher contact angle. The lower contraction stress, higher degree of conversion and compressive strength of the novel dental composites were also observed.
Highlights
Light-curing resin composites have been used more and more widely for restorative dentistry.These materials have superior physiochemical performance and manipulative qualities, and acceptable appearance and favorable biocompatibility
The results suggest that BisS-GMA is more effective than Bis-GMA when referring to the degree of conversion, which is consistent with prior work
The novel dental photocurable resin composite based on BisS-GMA as a resin matrix monomer and the expanding monomer BMSOC has a higher degree of conversion, which can indicate potentially valuable mechanical qualities
Summary
Light-curing resin composites have been used more and more widely for restorative dentistry. These materials have superior physiochemical performance and manipulative qualities, and acceptable appearance and favorable biocompatibility. They have the advantage of directly bonding to the tooth structure without the sacrifice of removing healthy tissues. The composite based on Bis-GMA has become vital for dental restoration due to its superior aesthetic quality, simple administration, and enhanced mechanical strength, there are still problems. Eliminating or reducing the amount of volumetric contraction during polymerization is one of the most important issues in the development of dental composites
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