title: The effect of using different rinsing angles on the micro-tensile bond strength of the sealant to the etched enamel.
abstract: BACKGROUND
  Attempts to enhance bond strength of the sealant have been among the most important sides of dental research.
  
  
  OBJECTIVE
  The purpose of the present study was to evaluate the effect of using different rinsing angles on the micro-tensile bond strength of the sealant to the etched enamel.
  
  
  METHODS
  Experimental study.
  
  
  METHODS
  Sixty first-premolars were randomly assigned to six groups based on the rinsing angle applied (15°, 30°, 45°, 60°, 75°, and 90°). Following etching and rinsing, a 4-mm height build up of sealant material was created. Bonded specimens were sectioned into sticks (1 × 1 mm), which were subjected to micro-tensile bond strength, testing at a cross-head speed of 0.5 mm/min.
  
  
  METHODS
  The data were analyzed by Kolmogorov-Smirnov and post-hoc Tukey test.
  
  
  RESULTS
  The tensile bond strength in specimens rinsed at 90° were statistically higher compared to those rinsed at 15° and 30° (P < 0.05), and increasing the angle from 15° to 90° was correlated with a reduction in the number of specimens with adhesive failures.
  
  
  CONCLUSIONS
  Rinsing the conditioned enamel surface at 90° may improve the bond strength and retention of the sealant.
authors.affiliation: Department of Pediatric Dentistry, Dental School, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Hossein
authors.initials: H
authors.lastname: Afshar
authors.affiliation: Department of Pediatric Dentistry, Dental School, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Yahya Baradaran
authors.initials: YB
authors.lastname: Nakhjavani
authors.affiliation: Department of Pediatric Dentistry, Shahed University, Tehran, Iran.
authors.forename: Rahil
authors.initials: R
authors.lastname: Ahmadi
keywords: Bond strength; retention; rinsing angle; sealant