Evaluation of Shear Bond Strengths of Three Adhesive Materials Used to Retain Fiber Post in the Severely Damaged Primary Anterior Teeth

Tooth decay and periodontal problems are among the most common human diseases which are considered unsolved health problems in most countries of the world. This study aimed to investigate and compare the shear bond strength of the fiber post with three different types of cement, including Glass ionomer, as well as Universal and Flowable composites.

This in-vitro study was conducted on 30 extracted anterior deciduous teeth with at least two-thirds of healthy roots. The teeth were randomly divided into three groups of 10. The teeth were mounted from the root part inside the self-curing acryl. Group 1 includes G-Premio Bond and Universal Composite, group 2 includes G-Premio Bond and flowable composite, and group 3 includes Glass ionomer without bond. Immediately, the fiber post was placed in the cemented material in the canal and was light-cured according to the manufacturer's instructions. Shear bond strength was performed by an electromechanical universal testing machine at a speed of 1 mm/min.

The shear bond strength mean values in the Universal composite, Glass ionomer, and Flowable composite groups were 15.29±4.82, 9.74±2.82, and 13.71±4.91 MPa, respectively, and the difference among them was significant (P=0.022). The shear bond strength mean value of the Universal composite was significantly higher than that of the Glass ionomer (P=0.020); however, this difference was not significant for comparing other groups (P<0.05).

The highest and lowest amount of shear bond strength values for cementing fiber post in the repair of anterior deciduous teeth were related to the Universal composite and Glass ionomer cement groups, respectively, which showed a significant difference but did not differ significantly from the Flowable composite group