title: Evaluation of Shear Bond Strength of Feldspathic CAD/CAM Ceramic with Dentin using 2 Bonding Agents and 2 Surface Treatments- An Invitro Study.
abstract: BACKGROUND
  All ceramics are the material of choice for aesthetic tooth replacements. The success of all ceramic restoration depends on the bond between the ceramic and the tooth surface hence this study was done to evaluate the shear bond strength of Feldspathic CAD/CAM ceramic with <5% hydrofluoric acid and hydrofluoric acid combined with silane coupling agent.
  
  
  OBJECTIVE
  To evaluate the shear bond strength of Feldspathic CAD/CAM ceramic with Dentin using bonding agents Prime & Bond NT, XenoIII and surface treatments <5% hydrofluric acid, hydrofluric acid combined with silane coupling agent.
  
  
  METHODS
  Forty cylinders with 6mm diameter and 5mm height were milled from CEREC Blocs through CAD/CAM technology. Cerec blocks were bonded to etch freshly extracted tooth surface using a self etch and total etch bonding agent. The samples were divided into 4 groups. Group A1-Ceramic cylinders were treated with < 5% HF and bonded using Prime & Bond NT and Variolink II. Group A2- treated with < 5% HF and silane coupling agent and bonded same as group A1. Group B1- treated with < 5% HF and bonded using Xeno III and Variolink II. Group B2- treated with < 5% HF and silane coupling agent, and bonded same as Group A3. The shear bond strength was evaluated after 24 hours by Storing in distilled water in Instron 3385 universal testing machine with 10-KN force.
  
  
  RESULTS
  Statistical analysis was done using student's t-test and Lavene's test. The p-value <0.05 shows significant difference in bond strength between A1 and A2 & B1and B2.
  
  
  CONCLUSIONS
  The application of a silane coupling agent to the ceramic surface after etching with hydrofluoric acid increased the adhesion strength with both bonding agents. Student's t-test revealed a significant effect of silanization.
authors.affiliation: Senior Lecturer, Department of Prosthodontics, SRM Dental College , Ramapuram, Chennai, India .
authors.forename: Ramesh Reddy
authors.initials: RR
authors.lastname: Jetti
authors.affiliation: Professor and HOD, Department of Prosthodontics, SRM Dental College , Ramapuram, Chennai, India .
authors.forename: Muthukumar
authors.initials: M
authors.lastname: Balasubramaniam
authors.affiliation: Reader, Department of Prosthodontics, SRM Dental College , Ramapuram, Chennai, India .
authors.forename: Ahila Singaravel
authors.initials: AS
authors.lastname: Chidambaranathan
authors.affiliation: Senior Lecturer, Department of Prosthodontics, SRM Dental College , Ramapuram, Chennai, India .
authors.forename: Suganya
authors.initials: S
authors.lastname: Srinivasan
keywords: Etching; Hybrid layer; Primer; Silane coupling agent; Silanization