Method: Materials tested (n=8 per group): Group A, Dyract® (DENTSPLY); Group B, Heliomolar® (Ivoclar Vivadent); Group C, DO-UC Capsule (3M ESPE); Group D, DO-UC Handmix (3M ESPE); Group E, Fuji II™ LC (GC America); Group F, Vitremer™ (3M ESPE); Group G, Kentac™ N100 (3M ESPE); Group H, Ketac™ Nano (3M ESPE); Group I, Fuji IX™ GP Capsule (GC America); Group J, Fuji IX™ GP Handmix (GC America); Group K, Chemfil® Rock (Dentsply). All samples were made using polyoxymethylene (Delrin®) molds with 3x3x5mm for light-cured specimens and 4x6mm for self-cured specimens. Samples were fabricated and cured according to manufacturers’ instructions. Self-cured specimens were put in 37°C water bath for 1hr after preparation. All samples sat in distilled water (37°C/24hrs) to complete cure. A universal Zwick machine loaded (10kN; crosshead speed 1.0mm/min) measured compressive strengths until fracture. One-way ANOVA and Fisher method tests showed a p<0.05.
Result:
Light-Cured (n=8 for each group):
Group |
Mix System |
Type of Material |
Results Mean±SD (MPa) |
A |
Compule |
Composite |
313,9±33,4 |
B |
Compule |
Composite |
309,5±17,8 |
C |
Capsule |
New |
292,4±23.4 |
D |
Handmix |
New |
266,6±22 |
E |
Handmix |
RMGI |
229±15 |
F |
Handmix |
RMGI |
195,5±14,6 |
G |
Clicker |
RMGI |
195,5±47,3 |
H |
Compule |
RMGI |
223,4±5,2 |
Self-Cured (n=8 for each group):
Group |
Mix System |
Type of Material |
Results Mean±SD (MPa) |
C |
Capsule |
New |
273,3±12,2 |
D |
Handmix |
New |
272±19,4 |
I |
Capsule |
GI |
199,5±37,1 |
J |
Handmix |
GI |
187±21,2 |
K |
Capsule |
GI |
191,5±6,4 |
For light-cured groups, both composites and the DO-UC capsule were significantly higher than the GI and RMGIs. For self-cured the DO-UC materials performed significantly higher than the GI materials.
Conclusion: The compressive strength of the DO-UC was significantly higher in comparison to the tested GI and RMGI materials. Values for DO-UC were comparable to the composites and there was no statistically significant difference between these groups. Further testing is required; this new material shows potential for use as a self-adhesive bulkfill product.