Effect of etching and sandblasting on bond strength to sintered porcelain of unfilled resin

Abstract

This study determined the bond strength of an unfilled resin joined to a feldspathic porcelain for the purpose of evaluating the retentive performance of the prepared material surfaces. Porcelain disks (VMK 68 dentin) were either air abraded with alumina (AAA) or etched with one of the following five etchants: (1) ammonium hydrogen bifluoride (AHB); (2) acidulated phosphate fluoride (APF); (3) hydrofluoric acid (HFA); (4) phosphoric acid (PHA); and (5) sulfuric acid-hydrofluoric acid (SHF). Specimens ground with abrasive paper were also used as controls. After surface preparation, the two different sized porcelain disks were bonded together with a methyl methacrylate-based resin initiated with tri-n-butylborane (MMA-TBB resin). Shear bond strengths were determined both before and after thermocycling. Before the thermocycling, the greatest bond strengths (21.3 and 23.7 MPa) were generated with the use of the SHF and HFA agents, followed by the AHB agent (18.4 MPa). Reduction in bond strength after thermocycling was significant for all groups, although the SHF- and HFA-treated groups exhibited bond strengths greater than 15 MPa even after the thermocycling. The results indicated the effectiveness of the SHF- or HFA-etching for retaining the acrylic resin to the porcelain. However, ageing testing also revealed insufficient retentive characteristics of the acrylic resin by etching alone.

Effects of Surface Treatments, Thermocycling, and Cyclic Loading on the Bond Strength of a Resin Cement Bonded to a Lithium Disilicate Glass Ceramic

“…3,[7][8] Another treatment recommended for ceramic surfaces involves airborne particle abrasion with 50-lm aluminum oxide (Al 2 O 3 ) particles to aid in mechanical retention. [7][8][9][10][11] After air abrasion, the ceramic surface must be coated with a suitable silane, which forms chemical bonds between the inorganic phase of the ceramic and the organic phase of the resin cement. 8,[12][13][14] Clinically, when ceramic restorations are cemented and exposed to the oral environment, factors that could result in fatigue may influence their physical and mechanical properties.…”

The Effect of Surface Treatments on the Micro-shear Bond Strength of a Resin Luting Agent and Four All-ceramic Systems

“…[9][10] The silicate-based ceramic surfaces are etched, often using hydrofluoric acid, which changes its microstructure by dissolution of one of the glassy phases of porcelain and by creating an appropriate microstructure for bonding. [11][12][13][14] Another pre-bonding treatment for ceramic surfaces is airborne aluminum oxide particle abrasion, [15][16] which similarly changes the microstructure of the ceramic surface. The interaction of the luting agent silicate ceramic can be enhanced by the application of a silane coupling agent.…”

Porcelain laminate veneer restorations bonded with a three-liquid silane bonding agent and a dual-activated luting composite

“…Etching feldspathic porcelain with hydrofluoric acid is effective in mechanically retaining resin-based bonding agents (1)(2)(3)(4)(5). Application of a methacrylate-based silane monomer enhanced the bonding between acrylic resin and feldspathic porcelain materials (6)(7)(8)(9).…”