Objective: The influence of the self-warming of a new vinylpolysiloxane (VPS) wash precision impression materials was studied by comparing clinically relevant material properties with those obtained for a commercially available material.
Method: For this study, Imprint 3 Quick Step Light Body (lot 483071; I3LBQ) and new experimental quick step light body material (lot AWT-0018; EXP) were used as impression materials. Test specimens were prepared by mixing each material with the conventional hand dispenser. Material properties were determined at defined times after start of mixing; after 25 second, at 50% and 95% of the working time given in the IFU. The following parameters were compared: Detail reproduction and consistency according to ISO 4823, maximum temperature and contact angle on unset material.
Results: Results and standard deviations are shown below. No differences were found for the detail reproduction. T-tests (p< 0.05) revealed no significant differences between for the consistency of the two materials, but significant differences for the temperature and the hydrophilicity.
| time
| EXP
| I3LBQ
| p
| N
|
max. temperature [°C] |
| 31.3 (0.2) | 28.4 (0.3) | 0.00 | 5 |
Detail reproduction | 25s | pass | pass | n.a. | 3 |
50%w.t. | pass | pass | n.a. | ||
95%w.t. | pass | pass | n.a. | ||
Consistency [mm] | 25s | 45 (0.5) | 44 (0.5) | 0.58 | 5 |
50%w.t. | 43 (0) | 43 (0.5) | 0.18 | ||
95%w.t. | 39 (1) | 39 (1) | 1.00 | ||
Contact angle, 2 sec drop age [°] | 25s | 20.8 (0.8) | 59.6(1.3) | 0.00 | 5 |
50%w.t. | 18.0(1.0) | 69.4(1.5) | 0.00 | ||
95%w.t. | 14.2(0.5) | 79.0(0.7) | 0.00 |
Conclusion:
The self-warming of the material did not lead to adverse effects on basic material properties such as consistency and detail reproduction.