title: Comparative evaluation of microshear bond strength of the caries-affected dentinal surface treated with conventional method and chemomechanical method (papain).
abstract: BACKGROUND
  There is a growing interest in chemomechanical excavation (papain) in permanent molar teeth. There are several studies dealing with primary molar teeth.
  
  
  OBJECTIVE
  The aim of this study was to evaluate the influence of conventional method and Carie-care (chemomechanical method) on the microshear bond strength (μSBS) and the type of failure of an adhesive system to caries-affected dentin of permanent molar teeth.
  
  
  METHODS
  Twenty permanent molar teeth with carious lesions extending into the dentin were selected. Through the center of the carious lesion, teeth were sectioned mesiodistally and divided into two groups based on the method of caries excavation (conventional and chemomechanical method). The time required for the completion of excavation procedure was noted. Samples were again divided into two subgroups in each according to the method of restoration (Ketac N100 and Filtek Z350 composite). The bonded interface was subjected to μSBS testing in a universal testing machine. Fractured surfaces were examined under a stereomicroscope, and representative specimens were examined under scanning electron microscope for the type of failure.
  
  
  METHODS
  It was achieved with unpaired t-test and Kruskal-Wallis H-test at 5% level of significance.
  
  
  RESULTS
  The μSBS values of Carie-care groups were similar to that of the conventional method. The μSBSs of resin composite were significantly (P < 0.001) more than that of resin glass ionomer bonded irrespective of the method of caries excavation.
  
  
  CONCLUSIONS
  A papain-based chemomechanical agent can be used safely as a method for caries removal when employing conventional adhesive systems.
authors.affiliation: Department of Conservative Dentistry and Endodontics, GSL Dental College, Rajahmundry, Andhra Pradesh, India.
authors.forename: Jyothi
authors.initials: J
authors.lastname: Chittem
authors.affiliation: Department of Conservative Dentistry and Endodontics, Vishnu Dental College, Bhimavaram, Andhra Pradesh, India.
authors.forename: Girija S
authors.initials: GS
authors.lastname: Sajjan
authors.affiliation: Department of Conservative Dentistry and Endodontics, Vishnu Dental College, Bhimavaram, Andhra Pradesh, India.
authors.forename: Kanumuri Madhu
authors.initials: KM
authors.lastname: Varma
keywords: Chemomechanical excavation; microshear bond strength; total etch adhesive system