Intrapulpal Pressure and Thermal Cycling: Effect on Shear Bond Strength of Eleven Modern Dentin Bonding Agents

This in vitro study reports on a modified method for testing shear bond strengths of dentin bonding agents (DBAs). In order to imitate the surface of vital human dentin better, all DBAs used in this investigation (10 commercially available and one experimental) were tested under intrapulpal pressure (13.6 mm Hg to 25 mm Hg) and exposed to thermal cycling (x 1500, 5° to 55°C). The difference between this testing method and a commonly used method (applying the DBA onto a dry dentinal surface and then storing in water at 37°C for 24 hours) was highly significant (p <.001, two‐way AN OVA). In group A (composite group) the bonding agent was light cured before the application of the composite resin. In group B (cementation group) the bonding agent and the composite resin were light cured simultaneously. The shear bond strengths recorded in this study were generally lower than other published results. A.R.T. Bond and P‐Bond (experimental dentin bonding agent) had the best average results in both testing groups.