title: Effect of various commercially available mouthrinses on shear bond strength of orthodontic metal brackets: an in vitro study.
abstract: BACKGROUND
  Alcohol is known to degrade and dissolve the bisphenol A glycidyl methacrylate present in the composite resin. The effect of alcohol containing mouthrinses on the shear bond strength of orthodontic metal brackets bonded with composite resin has not been verified until date and is the purpose of this study.
  
  
  OBJECTIVE
  The aims and objectives of the present study were to evaluate (1) Whether there is a significant difference in the shear bond strength of metal orthodontic brackets after the 1 year (12 h) and 2 years simulation (24 h) of mouth rinsing with 4 different commercially available mouthrinses (2 alcoholic and 2 alcohol-free mouthrinses) when compared to the control. (2) Whether alcohol containing mouthrinses have more adverse effect on the shear bond strength when compared with alcohol-free mouthrinses. (3) To assess the site of bond failure using adhesive remnant index.
  
  
  METHODS
  Experimental - laboratory based.
  
  
  METHODS
  A total of 100 upper premolars extracted for orthodontic purpose were collected immediately after extraction, cleared soft-tissue debris and blood and immediately stored in distilled water with 0.1% thymol crystals added to inhibit bacterial growth. Two alcohol containing mouthrinses and two alcohol-free mouthrinses were used and the bonded teeth were placed in the mouthrinses for a stipulated period of time (1 year simulation and 2 years simulation) and shear bond strength were tested using Lloyd Universal Testing Machine.
  
  
  METHODS
  The data were analyzed using analysis of variance and paired samples t-test.
  
  
  RESULTS
  After the 1 year and 2 years simulation time, samples stored in alcohol containing mouthrinses showed lower bond strength (P < 0.05) when compared to samples stored in alcohol free mouthrinses and distilled water (control).
  
  
  CONCLUSIONS
  Alcohol containing mouthrinses affect the shear bond strength of the metal orthodontic brackets bonded with composite resin (Transbond XT in the present study), more when compared with alcohol-free mouthrinses. It is, therefore, highly advisable to avoid alcohol containing mouthrinses in patients undergoing orthodontic treatment and use alcohol-free mouthrinses as adjuncts to regular oral hygiene procedures for maintaining good enamel integrity and periodontal health, without compromising the shear bond strength of the bonded metal brackets.
authors.affiliation: Department of Orthodontics, Priyadarshini Dental College and Hospital, Thiruvallur, Tamil Nadu, India.
authors.forename: Nazeer Ahmed
authors.initials: NA
authors.lastname: Meeran
authors.forename: Ashwin Mathew
authors.initials: AM
authors.lastname: George
mesh_terms: D006801:Humans; D066298:In Vitro Techniques; D009067:Mouthwashes; D016910:Orthodontic Brackets
chemical_list: D009067:Mouthwashes