singleshear

Singleshear is a type of shear bond strength test used to evaluate the adhesion between a dental restoration and the tooth structure. It is a commonly used method in dental materials science and restorative dentistry to assess the bond strength of resin-based materials, glass ionomers, and other dental adhesives. The test involves applying a shear force to a bonded specimen until failure occurs, and the force at failure is recorded as the bond strength.

The singleshear test is typically performed using a universal testing machine equipped with a shear fixture. The specimen is prepared by bonding a cylindrical rod or button to a tooth surface, and the bonded interface is then subjected to a shear force. The force is applied at a constant rate until the bond fails, and the maximum force recorded is used to calculate the bond strength.

The singleshear test has several advantages, including its simplicity, reproducibility, and the ability to simulate clinical conditions. However, it also has limitations, such as the potential for edge effects and the difficulty in controlling the bond area. Despite these limitations, the singleshear test remains a widely used method for evaluating the adhesion of dental restorations and adhesives.