title: Comparison of Effect of C-Factor on Bond Strength to Human Dentin Using Different Composite Resin Materials.
abstract: BACKGROUND
  The study was planned to assess the use of low shrinkage composites for restoring cavities with high configuration factor (C-factor) which are subjected to high stresses.
  
  
  OBJECTIVE
  The aim of the study was to evaluate the effect of C- factor on tensile bond strength to human dentin using methacrylate based nanohybrid and low shrinkage silorane composite.
  
  
  METHODS
  In this study 40 non carious human molar teeth were selected and assigned into two main groups - cavity (Class I cavity with high C-factor) and flat group (flat surface with low C-factor). Two different composite materials- methacrylate based and silorane low shrinkage composite were used to restore the teeth. Dentin surface was treated, adhesive application was done and composite was applied as per manufacturer's instructions. Samples were stored in distilled water then subjected to tensile bond strength measurement using universal testing machine.
  
  
  RESULTS
  Statistical analysis was done using Independent sample t-test. The mean bond strength in methacrylate based and silorane composite was significantly higher in flat preparation (Low C-factor) than cavity preparation. The mean bond strength in both cavity (High C-factor) and flat preparation(Low C-factor) was significantly higher in silorane than in conventional methacrylate based composite.
  
  
  CONCLUSIONS
  The bond strength of composites to dentin is strongly influenced by C-factor and type of composite resin material used.
authors.affiliation: Senior Lecturer, Department of Conservative Dentistry and Endodontics, Sri Sai College of Dental Surgery , Vikarabad, India .
authors.forename: Thakur Veerandar
authors.initials: TV
authors.lastname: Singh
authors.affiliation: Professor and Head, Department of Conservative Dentistry and Endodontics, PMNM Dental College , Bagalkot, India .
authors.forename: Jaya Prakash
authors.initials: JP
authors.lastname: Patil
authors.affiliation: Professor and Head, Department of Conservative Dentistry and Endodontics, Sri Balaji Dental College , Moinabad, India .
authors.forename: Rvs Chakradhar
authors.initials: RC
authors.lastname: Raju
authors.affiliation: Professor and Head, Department of Conservative Dentistry and Endodontics, Sri Sai College of Dental Surgery , Vikarabad, India .
authors.forename: Bhuvan Shome
authors.initials: BS
authors.lastname: Venigalla
authors.affiliation: Senior Lecturer, Department of Conservative Dentistry and Endodontics, Sri Sai College of Dental Surgery , Vikarabad, India .
authors.forename: S V
authors.initials: SV
authors.lastname: Jyotsna
authors.affiliation: Senior Lecturer, Department of Conservative Dentistry and Endodontics, Sri Sai College of Dental Surgery , Vikarabad, India .
authors.forename: Neha
authors.initials: N
authors.lastname: Bhutani
keywords: Bonding; Configuration factor; Polymerization; Shrinkage stress; Silorane composite; Tensilebond strength