title: A comparative evaluation of shear bond strength of porcelain and composite using different bonding agents - An in vitro study.
abstract: OBJECTIVE
  The purpose of the present in vitro study is to compare and evaluate the shear bond strength of porcelain and composite using different bonding agents.
  
  
  METHODS
  Sixty-three porcelain pellets were prepared and were divided into 9 groups. Three surface treatment and two bonding agents were evaluated. The surface treatment were: 1) sandblasting; 2) etching with 35% phosphoric acid; and 3) etching with 8% hydrofluoric acid. Applying bonding agents Scotch bond adhesive and clearfil liner bond 2V and combination of these treatments. Composite resin was condensed and light cured for 60 seconds on the porcelain specimens which were stored in distilled water at 37°C for 24 hours before mechanical testing.
  
  
  RESULTS
  The bond strength were significantly different according to ANOVA F-test (F = 6.28, p < 0.01) and Duncan's Multiple Range Test. Eight percent hydrofluoric acid showed higher bond strength when compared to 35% phosphoric acid etching and sandblasting by 50 micron aluminum oxide. Highest bond strength was observed with hydrofluoric acid + clearfil.
  
  
  CONCLUSIONS
  Etching with 8% hydrofluoric acid + clearfil liner bond showed higher bond strength when compared to hydrofluoric acid alone. This is indicative that effect of silane and etching can be use to improve mechanico chemical bonding. Among bonding agents used clearfil liner showed higher bond strength when compared to scotch bond adhesive.
authors.affiliation: Department of Prosthodontics, SDM College of Dental Sciences and Hospital, Sattur, Dharwad, 580009 India.
authors.forename: Roseline
authors.initials: R
authors.lastname: Meshramkar
authors.forename: Suresh
authors.initials: S
authors.lastname: Sajjan