Method: Bovine incisors were embedded in cold-cure acrylic resin. The labial surface of each tooth was ground to expose enamel (E) or dentin (D). A cylindrical button of FiltekTM Z250 A3 (3M ESPE, 2.36mm diameter, 2mm height) was cured on the tooth surfaces treated with SBU in SE and TE modes according to the manufacturer’s instructions, (n=5). A notched-edge shear method (Ultradent) was used to measure the SBS.
Result:
The table shows the SBS in MPa. The standard deviations (SD) are given in parentheses. All data per substrate and application mode were analyzed by ANOVA and multiple comparisons using Fisher’s LSD procedure (p<0.05). Means with the same letters are statistically the same.
time at RT |
E_SE [MPa] |
D_SE [MPa] |
E_TE [MPa] |
D_TE [MPa] |
0 months |
27.5 (2.7)A |
36.3 (4.1)A |
33.5 (2.9)A |
32.0 (4.4)A |
12 months |
22.7 (4.9)B |
27.4 (2.8)B |
28.5 (2.5)B |
28.3 (3.7)A |
24 months |
23.8 (1.8)AB |
28.1 (4.5)B |
29.5 (3.2)AB |
31.8 (5.9)A |
Conclusion: Several statistically significant differences were found. On all substrates with all application modes, high SBS of well over 20 MPa were obtained for fresh SBU and product stored for 24 months at RT.