title: Shear bond strength of composite resin to dentin after application of cavity disinfectants - SEM study.
abstract: OBJECTIVE
  The aim was to evaluate the effect of different cavity disinfectants on dentin bond strengths of composite resin applied with two different adhesive systems.
  
  
  METHODS
  Two-hundred mandibular molars were sectioned parallel to the occlusal surface to expose dentin in the midcoronal one-third. The dentinal surfaces were polished with waterproof-polishing papers. The specimens were randomly divided into five groups of 40 teeth each as follows: group 1(control) -- specimens were not treated with any cavity disinfectants. Groups 2--5 (experimental groups) -- dentin surfaces were treated with the following cavity disinfectants, respectively; 2% chlorhexidine solution, 0.1% benzalkonium chloride-based disinfectant, 1% chlorhexidine gel, and an iodine potassium iodide/copper sulfate-based disinfectant. The specimens were then randomly divided into two subgroups including 20 teeth each to evaluate the effect of different bonding systems. Dentin bonding systems were applied to the dentin surfaces and the composite buildups were done. After the specimens were stored in an incubator for 24 hours, the shear bond strength was measured at a crosshead speed of 1 mm/min. The specimens were then statistically analyzed.
  
  
  METHODS
  One way analysis of variance and Tukey-HSD tests were used.
  
  
  RESULTS
  There was no significant difference between chlorhexidine gel and control groups regardless of the type of the bonding agent used (P>0.05). On the other hand, pretreatment with benzalkonium chloride-based, iodine potassium iodide/copper sulfate-based disinfectants or chlorhexidine solutions had a negative effect on the shear bond strength of self-etching bonding systems.
  
  
  CONCLUSIONS
  The findings of this study suggest that when benzalkonium chloride-based, iodine potassium iodide/copper sulfate-based disinfectants or chlorhexidine solutions are used as a cavity disinfectant, an etch-and-rinse bonding system should be preferred.
authors.affiliation: Department of Conservative Dentistry and Endodontics, DJ College of Dental Sciences and Research, Modinagar, India.
authors.forename: Vivek
authors.initials: V
authors.lastname: Sharma
authors.forename: Poonam
authors.initials: P
authors.lastname: Rampal
authors.forename: Sukesh
authors.initials: S
authors.lastname: Kumar
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