title: Comparative evaluation of effect of metal primer and sandblasting on the shear bond strength between heat cured acrylic denture base resin and cobalt-chromium alloy: An in vitro study.
abstract: OBJECTIVE
  The aim of this study was to evaluate the effect of metal primers and sandblasting on the shear bond strength (SBS) of heat cured acrylic denture base resin to cobalt-chromium (Co-Cr) alloy.
  
  
  METHODS
  A total number of 40 disk shaped wax patterns (10 mm in diameter and 2 mm in thickness) were cast in Co-Cr alloy. Samples were divided into 4 groups depending on the surface treatment received. Group 1: No surface treatment was done and acts as control group. Group 2: Only sandblasting was done. Group 3: Only metal primer was applied. Group 4: Both metal primer and sandblasting were done. After surface treatment samples had been tested in Universal Testing Machine at crosshead speed of 0.5 mm/min in shear mode and scanning, electron microscope evaluation was done to observe the mode of failure.
  
  
  METHODS
  All the observations obtained were analyzed statistically using software SPSS version 17; one-way analysis of variance (ANOVA) and post-hoc Tukey test were applied.
  
  
  RESULTS
  The one-way ANOVA indicated that SBS values varied according to type of surface treatment done. The SBS was highest (18.70 ± 1.2 MPa) when both sandblasting and metal primer was done when compared with no surface treatment (2.59 ± 0.32 MPa).
  
  
  CONCLUSIONS
  It could be concluded that the use of metal primers along with sandblasting significantly improves the bonding of heat cured acrylic denture base resin with the Co-Cr alloy.
authors: Department of Prosthodontics, YIDSR, Gadholi, Yamuna Nagar, Haryana, India.
authors: Sandeep
authors: S
authors: Kalra
authors: Department of Prosthodontics, Nair Hospital Dental College, Mumbai, Maharashtra, India.
authors: Vishwas
authors: V
authors: Kharsan
authors: Department of Prosthodontics, CDER, AIIMS Hospital, New Delhi, India.
authors: Nidhi Mangtani
authors: NM
authors: Kalra
keywords: Cobalt-chromium alloy; metal primer; shear bond strength