Methods: Eight self-adhesive luting materials were tested: SpeedCEM (Ivoclar-Vivadent) BisCem (Bisco), Bifix-SE (Voco), iCem (Heraeus Kulzer), MonoCem (Shofu), RelyX-Unicem II Automix (3M), SmartCem-2 (Dentsply), U-Cem (Vericom). Water sorption, water solubility and flexural strength were measured according to ISO-4049 after light curing (lc). Bond strength to dentin was measured according to ISO-WD 16506 after light curing (lc) and self curing (sc) of the luting material.
Results: Flexural strength, water solubility, water sorption and dentin adhesion measurements showed the following results (different letters indicating significant differences, p=0.05, using oneway ANOVA and Tukey-test as post-hoc comparisons):
|
Water Solubility (µg/mm3) |
Water Sorption (µg/mm3) |
Flexural strength (MPa) |
Dentin Adhesion (MPa) (lc) |
Dentin Adhesion (MPa) (sc) |
SpeedCem |
2.29±0.79a |
33.3±1.1a |
100.9±7.9a |
15.83±1.70a |
11.70±1.68a |
BisCem |
3.26±1.19a |
85.9±4.3b |
47.3±13.3b |
8.32±1.73c |
3.06±4.42b |
Bifix |
-0.60±0.79b |
41.1±4.4a |
135.2±17.9c |
8.38±1.97c |
1.02±1.23b |
iCem |
-0.72±1.16b |
74.6±2.4b |
103.8±2.5a |
6.95±6.10c |
0.0±0.0b |
MonoCem |
0.96±0.92a,b |
79.7±5.0b |
101.2±13.4a |
7.73±1.65c |
0.0±0.0b |
RelX Unicem |
-3.14±0.65c |
27.3±1.2a |
96.6±8.3a |
24.82±3.35b |
0.0±0.0b |
SmartCem-2 |
0.73±0.90a,b |
46.0±3.3a |
101.7±22.1a |
8.74±1.56c |
0.0±0.0b |
U-Cem |
-0.48±0.27b |
33.9±2.7a |
123.2±13.4a,c |
3.86±2.71c |
0.0±0.0b |
Conclusions: All materials show adhesive properties after light curing, but not after self curing. The hydrophilic matrix has a significant influence on the water sorption. Some materials show values which are above the limit in ISO-4049 (< 40 µg/mm3). Conventional resin based luting materials have water absorption values of 20-25 µg/mm3.The other physical data are not affected by the hydrophilic matrix.