title: Effect of desensitizing treatments on bond strength of resin composites to dentin - an in vitro study.
abstract: OBJECTIVE
  Hypersensitivity is a common clinical multietiological problem. Many desensitizing treatments are there to overcome hypersensitivity. The aim of this study was to evaluate the effect of different dentin-desensitizing treatments on the tensile bond strength of composite restoration.
  
  
  METHODS
  Twenty-four sound human molars were used. Enamel was wet abraded to expose flat dentin surfaces, polished with sandpaper. The specimens were then divided into three groups (n = 8) based on the type of dentin-desensitizing treatment given. The first group: G1 was the control group where no desensitizing agent was used. The second group: G2 was treated with desensitizing dentifrice containing a combination of potassium nitrate, triclosan, and sodium monoflorophosphate. The third group: G3 was treated with Er:YAG laser. Afterwards, the desensitized specimens were treated with one step self-etch adhesive according to manufacturer's instructions and composite microcylinders were packed. The specimens were then examined for tensile bond strength using universal tensile machine (KMI(TM) ).
  
  
  RESULTS
  Statistical analysis of the data obtained revealed the mean values for the tensile bond strengths were 10.2613 MPa, 5.9400 MPa and 6.3575 MPa for groups 1, 2 and 3, respectively. These values were statistically significantly different between groups pretreated with laser or dentifrice as compared to control group.
  
  
  CONCLUSIONS
  Dentifrice and Laser pre-treated dentin has lower tensile bond strength with resin composites as compared to dentin that is untreated.
authors.affiliation: Department of Conservative Dentistry and Endodontics, National Dental College and Hospital, Derabassi, Punjab, India.
authors.forename: Sameer
authors.initials: S
authors.lastname: Makkar
authors.affiliation: Department of Conservative Dentistry and Endodontics, National Dental College and Hospital, Derabassi, Punjab, India.
authors.forename: Meenu
authors.initials: M
authors.lastname: Goyal
authors.affiliation: Department of Conservative Dentistry and Endodontics, National Dental College and Hospital, Derabassi, Punjab, India.
authors.forename: Ashih
authors.initials: A
authors.lastname: Kaushal
authors.affiliation: Department of Conservative Dentistry and Endodontics, Rangoonwala College of Dental Sciences, Pune, Maharashtra, India.
authors.forename: Vivek
authors.initials: V
authors.lastname: Hegde
keywords: Dentin desensitization; erbium lasers; potassium nitrate containing dentifrice; tensile bond strength