title: Comparative Evaluation of Bond Strength of Dual-Cured Resin Cements: An In-Vitro Study.
abstract: BACKGROUND
  To compare the microtensile bond strength of resin cements to enamel and dentin and to determine the type of bond failure using stereomicroscope.
  
  
  METHODS
  In this in-vitro study 40 teeth were embedded in acrylic resin and divided into two main groups i.e., Group A for enamel and Group B for dentin. Each group is again subdivided into four subgroups, which are as follows; Subgroup 1 for Calibra resin cement, Subgroup 2 for Paracem, Subgroup 3 for Variolink II and Subgroup 4 for Rely X ARC. These resin cements were applied on enamel and dentin according to manufacturer's instructions followed by incremental build-up of composite resin on the top of resin cements. Each tooth was sectioned perpendicular to the resin-substrate interface with a slow speed diamond saw under water cooling yielding sections of approximately 1 mm(2). On an average, three sections from each tooth were used for testing. The beams obtained after sectioning were stressed to failure under tension in a custom made stainless steel forceps held in a universal testing machine (Lloyd) at a crosshead speed of 1.0 mm/min. Results were analyzed using two-way analysis of variance, independent t-test, and Tukey's HSD post-hoc test.
  
  
  RESULTS
  Cements bonded to enamel substrates showed higher mean bond strength compared to dentin, which is statistically significant. Rely X ARC showed highest mean bond strength to both the substrates.
  
  
  CONCLUSIONS
  There was a significant difference between the bond strength to enamel and dentin and, Rely X ARC resin cement showed higher bond strength compared with the other groups.
authors.affiliation: Professor and Head, Department of Conservative Dentistry and Endodontics, M R Ambedkar Dental College and Hospital, Bengaluru, Karnataka, India.
authors.forename: R Veena
authors.initials: RV
authors.lastname: Kumari
authors.affiliation: Post-graduate Student, Department of Conservative Dentistry and Endodontics, M R Ambedkar Dental College & Hospital, Bengaluru, Karnataka, India.
authors.forename: Ramya Krishna
authors.initials: RK
authors.lastname: Poluri
authors.affiliation: Post-graduate Student, Department of Conservative Dentistry and Endodontics, M R Ambedkar Dental College & Hospital, Bengaluru, Karnataka, India.
authors.forename: Hema
authors.initials: H
authors.lastname: Nagaraj
authors.affiliation: Post-graduate Student, Department of Conservative Dentistry and Endodontics, M R Ambedkar Dental College & Hospital, Bengaluru, Karnataka, India.
authors.forename: Kishore
authors.initials: K
authors.lastname: Siddaruju
keywords: Dentin; enamel; resin cements