Development of new filler materials for light curing dental composites
Methods:
The formulations were prepared containing Bis-GMA (2,2-bis[4-(2-hydroxy-3-methylacryloxypropoxy)-phenyl]propane associated with TEGDMA (2-methyl-2-propenoic acid). The photoinitiatior system was composed of camphorquinone and 2-(dimethylamino)ethyl methacrylate. Fillers were added up to the filling degree described.
The preparation of dental composites using Quarzwerke MICROSPAR® filler took place by mixing all parts by hand to a visible bubble free paste.
Results:
| flexual bond strength [MPa] | shear bond strength [MPa] | vickers hardness [HV 5-20] | Roughness4); Ra [µm] | |||
| reference 0.7 µm 1) | 115,6 | 22,6 | 47,0 | - | ||
| reference 1.0 µm 2) | 145,0 | 31,3 | 54,4 | - | ||
| MICROSPAR 1351-980 MST | 144,0 | 19,7 | 48,5 | 0,05 | ||
| MICROSPAR 1351-900 MST | 212,0 | 29,7 | 53,9 | 0,05 | ||
| MICROSPAR 1351-600 MST | 205,0 | 28,2 | 51,3 | 0,05 | ||
| MICROSPAR mixture3) | 203,0 | 31,3 | 47,6 | 0,05 | ||
| 1) | GM 39923 UF 0.7; 6,0% Methacrylsilane | |||||
| 2) | GM 27884 UF 1.0; 4,6% Methacrylsilane | |||||
| 3) | Mixture MICROSPAR 1351-900 MST / MICROSPAR 1351-600 MST; 40 wt% / 60 wt% | |||||
| 4) | polishing methode | |||||
| 1st step: roughening via hard metal grinder | ||||||
| 2nd step: CompoMaster Coarse (Shofu) | ||||||
| 3rd step: CompoMaster (Shofu) | ||||||
| 4th step: DirectDia Paste; Super Snap Buff Disk (Shofu) | ||||||
Conclusions: