IADR Abstract Archives
Progressions on ORMOCER®-Based Composites
Objectives: ORMOCER®s are advanced filling materials for use in dentistry which, due to their innovative matrix technology and filler particles, represent state-of-the-art science. ORMOCER®-based filling materials are well known as biocompatible, abrasion-resistant with low polymerization shrinkage. This study presents the progressions of mechanical properties of ORMOCER®-based filling materials from the very beginning with Admira to the latest experimental ORMOCER®-based composites compared to one conventional composite.
Methods: The materials studied were: Ceram XTM Mono (CX, Dentsply DeTrey), Tetric® Evo Ceram (TEC, Ivoclar Vivadent), Admira® (AD, VOCO) and two experimental composites (OC1 and OC2, VOCO) based on a pure ORMOCER® matrix. The specimens for the Vicker's micro hardness (MHV) were prepared like specimens for flexural strength according to ISO 4049. The measurements were executed with a microhardness testing machine MHT-4 with video measurement device (Carl Zeiss Oberkochen). Volumetric shrinkage was executed on a dilatometer according to a standard ACTA method (J. Prosthet. Dent. 59, 1988, 297-300). The abrasion measurements were executed on a Willytec testing device according to an ACTA method (J. Dent. Suppl. 1, 22, 1994, 21-27) and were analysed with a Laserscan 3D (Willytec). Data were tested by one-way ANOVA followed by Duncan's multiple analysis on the .05 level.
Results:
|
|
TEC |
AD |
CX |
OC1 |
OC2 |
|
Abrasion [µm] |
48,6 (8,2)c |
52,1 (4,7)c |
71,4 (5,0)d |
34,6 (3,8)b |
28,9 (2,2)a |
|
Vicker's Micro Hardness [MHV] |
94,4 (1,2)c |
100,1 (1,0)c |
97,0 (0,9)c |
202,6 (5,4)b |
313,8 (20,4)a |
|
Volumetric shrinkage [%] |
2,29 (0,08)c |
2,50 (0,06)d |
2,65 (0,13)e |
1,97 (0,04)b |
1,49 (0,05)a |
OC2, the latest experimental ORMOCER®-based filling material, showed significantly the best results in abrasion, Vicker's micro hardness and volumetric shrinkage.
Conclusion: The study demonstrated higher mechanical properties for the latest experimental ORMOCER®-based filling material. The new filler composition and the pure, monomerfree ORMOCER® resin matrix provided superior properties compared to conventional and first generation ORMOCER®- based composites.