Objectives: To assess the effect of Nd:YAG laser, Diode laser and CPP/ACP on treatment of patient with dentin hypersensitivity.
Design: A randomized clinical trial.
Setting and conduct: The eligible patients dentin hypersensitivity who will refer to the School of Dentistry during the study period will be enrolled into the trial.
Inclusion criteria: Age of 18 to 65 years; dentin hypersensitivity; suitable plaque index with no packet.
Exclusion criteria: Pregnancy or breastfeeding; systemic disease; periodontal surgery during the last 6 months; whitening treatment of teeth in the last 6 months; using anti-hypersensitivity and anti-inflammatory mouthwash or tooth paste during the last 72 hours; using anti-depressive drugs; using orthodontic devices; the presence of fractures, cracks, decay and deep repair in the teeth and adjacent teeth.
Intervention group 1: Two teeth in every patients are treated with Nd:YAG laser, with 1064 nm wave length, power of 1 W; pulse width of 300 sµ, frequency of 15 Hz, irradiation time of 30 seconds through contact mode, with a hand piece of 300 µ and a density of 294 j/cm with sweeping movement.
Intervention group 2: Two teeth in every patients are treated with Diode laser, with 940 nm wave length, power of 1 W; pulse width of 300 sµ, frequency of 15 Hz, irradiation time of 60 seconds through contact mode, with a hand piece of 400 µ and a density of 294 j/cm with sweeping movement.
Intervention group 3: Two teeth in every patients are treated with casein phosphopeptide phosphate calcium amorphic jell for 5 minutes.
Control group: Two teeth in every patients are considered as control group without treatment.
Primary outcome: Assessing the dentin hypersensitivity with visual analog scale (VAS) one hour after intervention.
Randomization: Eight teeth are selected in each patient. Then, every two teeth are randomly allocated through drawing of lots to intervention groups (three groups) and control group (one group).
Blinding: Not possible.