Abstract / Description of output
The aim of this study was to optimize the concentration of 2,4,6-trimethylbenzoyldiphenylphosphine oxide (Lucirin (R) TPO) in unfilled and filled composite resins in relation to the degree of conversion (DC). Increasing concentrations of Lucirin (R) TPO between 0.05-4.97 wt% were added to equimolar mixtures of Bis-GMA/TEGDMA. Filled resins contained 75 wt% fillers. Standardized samples were cured using a polywave LED light-curing unit (bluephase (R) G2, Ivoclar Vivadent). Increased initiator concentrations increased logarithmically the DC of unfilled and filled resins. The DC of unfilled resins was in the range of 73-91% at the top and 63-81% at the bottom surfaces and that of filled resins was in the range of 53-81% at the top and 47-70% at the bottom surfaces. The DC in unfilled and filled resins reached a plateau at 1.08 wt% and 1.50 wt% Lucirin (R) TPO, respectively. Fillers significantly reduced conversion but had no effect on the logarithmic relationship between initiator concentration and the DC.
| Original language | English |
|---|---|
| Pages (from-to) | 717-723 |
| Number of pages | 7 |
| Journal | Dental materials journal |
| Volume | 31 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - Sept 2012 |
Keywords / Materials (for Non-textual outputs)
- SPECTROSCOPY
- HYDROPHILICITY
- BLENDS
- EFFICIENCY
- ADHESIVES
- Lucirin (R) TPO
- Light curing unit
- Raman
- LIGHT CURING UNITS
- DENTAL PHOTOINITIATORS
- POLYMERIZATION
- CURED RESIN
- Composite
- Degree of conversion