2015 Volume 58 Issue 6 Pages 474-481
Purpose: One step self-etching adhesives are becoming increasingly popular in clinical situations due to their convenience. Recently, so-called universal-type bonding agents, which are designed to adhere to not only dentin but also dental materials, have been developed. However, there have been only a few studies that compared the bonding ability of conventional one-step bonding agents and universal agents. This study investigated the bonding ability to dentin of a universal type of bonding agent that contains a newly-developed thiophosphoric acid ester monomer by means of transmission electron microscope (TEM) and micro tensile bond strength (μTBS) testing. The data of bond strength were analyzed by Student’s t-test.
Methods: Twenty caries-free human third molars were used in this study. The tested bonding agents were G-BOND PLUS (GPL, GC), which is a conventional type, and G-Premio BOND (GPR, GC), which is a new universal type. We applied them on the flat dentin and built up Protect liner F (Kuraray Noritake Dental) for TEM samples and Clearfil AP-X for μTBS samples. The samples were subjected to TEM observation and μTBS testing respectively after 24 h water storage.
Results: TEM images of both GPL and GPR showed a typical good interface between dentin and resin without any gap. There was no significant difference in μTBS between GPL (41.35±15.24 MPa) and GPR (44.09±12.84 MPa).
Conclusion: The newly-developed universal bonding agent had no significant difference compared to the conventional one, and so provides adequate performance for clinical treatment.
