H. LU, K.L. O'KEEFE, and J.M. POWERS, University of Texas Dental Branch at Houston, USA Objective: Properties of a self-adhesive resin-based cement were compared to resin and traditional cements. Methods: The flexural properties, color stability and radio-opacity of Unicem (UN), glass ionomer (Fuji I, FI), hybrid ionomer (FujiCEM, FC), compomer (Principle, PR) and resin cement (Variolink II, VII) were determined. Two curing modes of UN (LC, SC) and VII (LC, DC) were tested. Flexural strength (FS) and modulus (FM) were tested with an Instron at 0.5 mm/min (n=8). Color stability was measured with a spectrophotometer (ColorEye 7000) after specimens were aged at 150, 300, 450 kJ/m2 (n=5). Radio-opacity was tested by ISO 4049. Results: Means (sd) of flexural properties and color stabilities are listed. Fisher's PLSD intervals (PLSD) are listed (p=0.05). | Product | FS, MPa | FM, GPa | DE*, 150 kJ/m2 | DE*, 300 kJ/m2 | DE*, 450 kJ/m2 | | UNLC | 88 (8) | 8.7 (0.5) | 8.8 (0.2) | 8.0 (0.6) | 3.5 (0.8) | | UNSC | 71 (5) | 6.3 (0.3) | 6.0 (1.0) | 9.4 (1.4) | 14.3 (2.2) | | FI | 22 (5) | 10.6 (2.1) | -- | -- | -- | | FC | 30 (2) | 3.8 (0.5) | 20.3 (0.3) | 22.5 (0.8) | 22.6 (0.4) | | PR | 75 (5) | 8.6 (1.1) | 5.6 (0.8) | 5.4 (0.6) | 7.1 (0.8) | | VIILC | 133 (12) | 9.1 (0.9) | 7.7 (3.0) | 9.8 (0.6) | 10.5 (0.4) | | VIIDC | 124 (14) | 10.3 (0.5) | 10.2 (0.2) | 11.3 (0.1) | 11.8 (0.2) | | PLSD | 9 | 1.0 | 1.6 | 1.6 | 1.6 |
Conclusions: There were significant differences in FS and FM. VII had the highest FS, followed by UN, PR and FI. Color stability decreased as the accelerated aging energy level increased except UNLC. Resin-based cements (UN, PR, VII) were more color stable than glass ionomers (FI and FC). UN and PR passed the ISO standard in radio-opacity test while FI and FC failed. Supported by 3M ESPE. |