Effectiveness of Resin-Based Desensitizer and Laser, Compared to Fluoride Varnish in Management of Dentine Hypersensitivity in Non-carious Cervical Lesions

1. Participants Randomization and Allocation:

Using computer generated randomization, the participants will be allocated randomly into four equal groups.

The sequentially numbers that will be generated, will be placed in opaque envelope until the intervention and each participant will be asked to select an envelope that determine which group of intervention he will be assigned. 2. Interventions:

Grouping 84 patients who fulfill the inclusion criteria will be enrolled to the study. For every patient a tooth of complain which fulfill the inclusion criteria will be selected, so the total number of included teeth will be 84 teeth. Teeth will be classified into 4 groups according to the type of desensitizer used. Where in group 1 (G1) patients will be randomly assigned to "Resin-Based Desensitizer", in group 2 (G2) patients will be randomly assigned to "Laser Desensitizer", in group 3 (G3) patients will be randomly assigned to "Combination of Laser + Resin-Based Desensitizer", and in group 4 (G4) patients will be randomly assigned to "Fluoride-Based Desensitizer". For every patient, sensitivity test will be done using visual analogue scale immediately after application, three months after application and six months after application. Table 1 shows the variables of the study, and Table 2 shows the variables of the study.

Each patient's name will be replaced with a case number within the group to protect the privacy of medical information and data of the patients.