Photopolymerization of highly filled dimethacrylate-based composites using Type I or Type II photoinitiators and varying co-monomer ratios

- MAPO and CQ-based filled resin composites were mixed using four BisGMA/TegDMA ratios..
- Polymerization was monitored using both FT-NIRS and DEA and post-cure properties were also determined.
- Initial ionic viscosity increased with BisGMA content, impacting final conversion.
- Specific BisGMA contents were shown to be optimal (40 mol% - MAPO or ≤20 mol% - CQ).
- Free and filler-bound monomer mobility and reactivity likely varied with the initiator.