Method: For this study, Aquasil-Ultra-XLV regular set (Dentsply Caulk, #120418; AQU), Flexitime-Light-Flow (Heraeus Kulzer, #350448; FLF), Take1Advanced-Light-Body regular set (Kerr, #2-1065; T1A) and one experimental light-bodied material (#AWT-0027; EXP) were used as impression materials. Contact angles at 2s (N=5) were measured by the commercially available Drop Shape Analysis System DSA-30 (Kruss) at 3 defined times after start of mixing: at 25 s, 50% and 95% of the working time indicated in the respective IFU. Contact angles were determined for water, artificial saliva and artificial blood plasm (HAES-steril, FreseniusKabi; #14EK7106).
Result: Results and standard deviations are shown below. One-way ANOVA and Tukey Test revealed significant differences between materials with EXP showing the lowest contact angles for all conditions and media.
|
EXP |
AQU |
FLF |
T1A |
Water-25 s |
19.6(1)c |
47.1(1.1)a |
43.1(2.8)b |
49.7(0.7)a |
Water-50% |
14.5(1.1)d |
68.9(2.3)a |
52.2(2.8)c |
60.9(1)b |
Water-95% |
9(1.3)d |
129(2.1)a |
75.1(2.6)c |
100.5(2.6)b |
Saliva-25s |
18.9(1.2)d |
46.1(1)b |
42.9(1.1)c |
48.7(0.8)a |
Saliva-50% |
15.7(1.3)d |
70.8(3.9)a |
52.5(1.2)c |
58.7(1.3)b |
Saliva-95% |
8.3(0.5)d |
128.8(1.2)a |
68(2.5)c |
91.5(4.6)b |
Blood Plasm-25s |
28(1.8)d |
46.2(1.6)b |
41.8(0.3)c |
49.5(1.3)a |
Blood Plasm-50% |
23.8(0.5)d |
74.4(6.9)a |
49.7(1.1)c |
61.6(1.1)d |
Blood Plasm-95% |
15.1(0.8)d |
125.4(2.3)a |
74.3(2.4)c |
114.6(6.5)b |
Means that do not share a letter are significantly different.
Conclusion: All materials except EXP showed decreasing hydrophilicity with the progression of setting. EXP was found to have the lowest contact angle in all media and at all conditions. This may indicate that at impression taking this material will have the best flow properties in moist conditions and will be influenced to a lower degree by saliva or blood contamination. The clinical relevance has yet to be tested.