Objectives: This study investigated the shear bond strength (SBS) of currently used dentin bonding agents (DBAs) that were polymerized with a halogen and a light emitting diode (LED). Methods: The halogen light and the LED light were a VIP (400mWcm-2 intensity mode, Bisco, Schaumburg, IL, USA) and an Elipar Freelight (3M-ESPE, St Paul, MN, USA), respectively. The five DBAs were Scotchbond Multipurpose (MP, 3M ESPE), Single Bond (SB, 3M ESPE), One-Step (OS, Bisco), Clearfil SE Bond (SE, Kuraray), and Adper Prompt (AP, 3M ESPE). 120 extracted human third molars were sectioned to expose the occlusal dentin and polished to 500-grit finish. Specimens were divided into 10 groups (n=12). Bonding procedures were performed according to manufacturer's protocols. The SBS test was conducted after 24 hours water storage using a universal testing machine at a crosshead speed of 1.0mm/min. Data were analyzed using T-test (P<0.05). The fractured dentin surface was observed with SEM to determine the failure mode. Results: Means and standard deviations of SBS (Mpa) are listed below.
|
DBA |
Halogen |
LED |
P-value |
|
MP |
24.24 (8.06) |
22.22 (7.62) |
0.535 |
|
SB |
25.32 (8.63) |
26.98 (5.37) |
0.577 |
|
OS |
20.91 (8.02) |
21.29 (5.62) |
0.892 |
|
SE |
37.60 (7.34) |
25.38 (9.24) |
0.002 |
|
AP |
20.14 (3.69) |
16.81 (5.21) |
0.085 |
There was no evidence of dentin pull-out in SEM observations. Conclusion: With the exception of the SE (P<0.05), each 4 DBAs showed no significant difference between the halogen group and the LED group in the mean SBS (P>0.05). This study was supported by 04-2002-061, SNUH FUND.