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Effects of polymerization initiator complexation in methacrylated beta-cyclodextrin formulations
Latiff A Hussain1, Sabine H Dickens, Rafael L Bowen
1Paffenbarger Research Center, American Dental Association Health Foundation, National Institute of Standards and Technology, 100 Bureau Drive, Stop 8546, Gaithersburg, MD 20899, USA. latiff.hussain@nist.gov
Summary
Methacrylated beta-cyclodextrin (MCD) complexation with initiators like camphorquinone affects dental composite strength and conversion. Understanding these interactions is key for developing new dental materials with improved properties.
Area of Science:
- Dental Materials Science
- Polymer Chemistry
- Biomaterials Engineering
Background:
- Methacrylated beta-cyclodextrin (MCD) is a novel dental monomer with a hydrophobic cavity.
- MCD can complex with various molecules, including polymerization initiators.
Purpose of the Study:
- To investigate the impact of complexing camphorquinone (CQ) and ethyl-4-dimethylaminobenzoate (4E) with MCD.
- To determine the effects on flexural strength (FS) and degree of conversion (DC) of dental composites.
Main Methods:
- Complexation of CQ and 4E with MCD was confirmed using thin-layer chromatography.
- Dental composite formulations were prepared using MCD, HEMA/TEGDMA, and varying concentrations of CQ/4E.
- Flexural strength was measured using an Instron machine, and degree of conversion was assessed via differential photocalorimetry.
Main Results:
- MCD successfully formed inclusion complexes with CQ and 4E.
- Both FS and DC of MCD-based composites showed significant variations dependent on initiator concentration.
Conclusions:
- Complexation of polymerization initiators with MCD influences the FS and DC of dental formulations.
- These findings are crucial for the evaluation and optimization of MCD as a dental monomer.