EFFECTS OF SURFACE-TREATMENT AND BONDING AGENTS ON BOND STRENGTH OF COMPOSITE RESIN TO PORCELAIN

This study evaluated porcelain repair by use of various surface treatm ents and hydrophilic bonding resins. The surface treatments were air a brasion (sandblasting), roughening with a diamond, etching with 9.6% h ydrofluoric acid, and a combination of the latter two methods. A silan e coupling agent was applied to all porcelain surfaces, and composite resin was bonded to porcelain with All-Bond 2, Amalgambond, or Clearfi l Porcelain bonding agents. Shear bond strengths were determined on a universal testing machine. The most effective surface treatment was th e combination of diamond roughening and hydrofluoric acid etching, but it was not significantly better than the other methods. The Clearfil Porcelain Bond system showed a greater repair strength than the other two materials but was statistically different only from Amalgambond re sin.