Abstract
‌of Nd: YAG laser and dentin binding agents in dentin ‌hypersensitivity
 Dr. E. Yasini* - Dr. Gh. KarimiKahaki**
*- Associate professor of Operative Dentistry Dept. Faculty of Dentistry - Tehran University of Medical Sciences.
** - Dentist.
 Background and aim: Dentin hypersensitivity is a chronic complaint among adult patients. The goal of this study was to compare the durability of the application of two techniques, Nd: YAG laser and dentin bonding agents, in the elimination of hypresensitivity.
Materials and Methods: Twenty - eight patients with 116 hypersensitive teeth, who referred to the Operative Dentistry Department, Faculty of Dentistry, Tehran University of Medical Sciences, were,enrolled in this clinical trial. The left lower and upper teeth received Nd: YAG laser treatment (0.3 w, .4 w, 0.5 w, 0.6 w, 0.7 w, 0.8 w, 0.9 and 1 w, each for 03 seconds). Then, dentin hypersensitivity was investigated applying forced air and in positive cases, laser treatment was repeated. The hypersensitive teeth, on the right side, were firstly etched with %37 phosphoric acid. For 5 seconds, washed with water and airdried. Then a single layer of excite adhesive was applied and after30-second airdrying, the teeth were light. cured for 20 seconds. In case of hypersensitivity, this technique was reapplied. In 3 and 6 months follow-ups, hypersensitivity was investigated and the data were analyzed using Mann-Whitney test.
 Results: In 6-month follow-up, the success rate of dentin bondings was %62.7 where as that of laser was.%42 showing a statistically significant difference (<0.05).
Conclusion: Although both techinques lead to the reduction or total elimination of dentin sensitivity, dentin bonding agents exert a more durable effect.
 Key Words: Sensitive teeth - Nd: YAG laser - Dentin bonding agent.