Comparative evaluation of the efficacy of bonding agents in cervical cavities after using desensitizing agents: an in vitro study

Introduction:
Dentinal hypersensitivity is a painful condition of multifactorial etiology. The use of desensitiz­ing agents has been incorporated as a routine approach in most adhesive restorative procedures irrespective of bonding agent. However, the effect of desensitizers on bond strength is still controversial.

Objectives:
To evaluate and compare the pull-out bond strength of 5^th and 7^th generation bonding agents after using two desensitizing agents.

Material and methods:
Twenty-four extracted teeth were collected and stored in saline. Class V cavities were prepared using SI-47 diamond points. After dentin conditioning, samples were randomly divided into two groups. Group A: treatment with Shield Activ – sub-group 1A: application of 5^th generation bonding agent, sub-group 2A: application of 7^th generation bonding agent. Group B: treatment with Gluma, sub-group 1B – application of 5^th generation bonding agent, sub-group 2B: application of 7^th generation bonding agent. The cavities were then restored with composites, and samples were subjected to pull-out bond strength testing using universal testing machine.

Results:
When comparing the pull-out bond strength of group A, it was found that sub-group 2A (Shield Activ + Single Bond Universal) performed better. When comparing the pull-out bond strength of group B, sub-group 2B (Gluma+ Single Bond Universal) performed better. When comparing the pull-out bond strength of all groups, sub-group 2B (Gluma + Single Bond Universal) performed the greatest.

Conclusions:
Gluma with Single Bond Universal shows the highest value of the pull-out bond strength.