Effect of Various Surface Conditioning Methods on the Adhesion of Dual-cure Resin Cement with MDP Functional Monomer to Zirconia after Thermal Aging

Abstract

This study evaluated the effect of chairside and laboratory types of surface conditioning methods on the adhesion of dualcure resin cement with MDP functional monomer to zirconia ceramic after thermocycling. Disk-shaped (diameter: 10 mm, thickness: 2 mm) Y-TZP ceramics (Lava™, 3M ESPE) were used (N＝40) and finished with wet 1200-grit silicon carbide abrasive paper. Specimens were randomly divided into four experimental groups according to the following surface conditioning methods (n＝10 per group): Group 1-Chairside airborne particle abrasion with 50-μm Al2O3 + Alloy Primer (Kuraray); Group 2-Airborne particle abrasion with 50-μm Al2O3 + Cesead II Opaque Primer (Kuraray); Group 3-Airborne particle abrasion with 50-μm Al2O3 + Silano-Pen + silane coupling agent (Bredent); Group 4-Laboratory tribochemical silica coating (110-μm Al2O3 + 110-μm SiOx) (Rocatec) + silane coupling agent (ESPE-Sil). Adhesive cement, Panavia F 2.0 (Kuraray), was bonded incrementally to the ceramic surfaces using polyethylene molds (diameter: 3.6 mm, height: 5 mm). All specimens were thermocycled (5 and 55℃, 6,000 cycles) and subjected to shear bond strength test (1 mm/min). Data were statistically analyzed (one-way ANOVA, α＝0.05), whereby no significant differences were found among the four groups (8.43±1.3, 8.98±3.6, 12.02±6.7, and 8.23±3.8 MPa) (p＝0.1357). Therefore, the performance of chairside conditioning methods used for zirconia was on par with the laboratory alternative tested.

Effect of ultrashort pulsed laser on bond strength of Y-TZP zirconia ceramic to tooth surfaces

“…This result agreed with the results of previous studies which reported higher bond strengths with the use of MDPbased primer 8,42) . This could be due to the capability of acidic functional monomer MDP reacting with the substrate [13][14][15][16][17][18][19] .…”

“…Therefore, these ceramics are not suitable for acid etching 8,[14][15][16] . For this reason, surface treatment methods ranging from air abrasion with aluminum oxide (Al 2O3) 8,[17][18][19][20] and silica coating with silica-modified Al2O3 particles 9,17,18,21) to laser application are frequently used on Y-TZP restorations.…”

Effect of sandblasting and various metal primers on the shear bond strength of resin cement to Y-TZP ceramic

“…Recently, the metal primers have been suggested to act as adhesion promoters. Application of metal primer is easy and requires no elaborate or high-priced equipments [31,32]. However, results with metal primers were not always satisfactory, because they attained a high bond strength under dry circumstances, but controversial reports came out under intraoral, wet conditions with reference to their hydrolytic stability [12,21,32,33].…”

“…This is because the MDP monomer bonds directly to metal oxides [27,38]. There might be reactions between the hydroxyl groups in MDP monomer and the hydroxyl groups on zirconia ceramic surface [31]. Moreover, the highest bonding strength was achieved when MDP-containing metal primer was used in combined with sandblasting of the zirconia surface.…”

Influence of light irradiation on Vickers hardness of dual-cure cement polymerized under restorations

“…The bonding surface of each adherend was polished using 240-, 400-, and 600-grit silicon carbide papers (CarbiMet Abrasive Discs, Buehler, Lake Bluff, IL, USA) with ample water cooling. This was followed by airborne particle abrasion with 50-µm aluminum oxide particles (Hi Aluminas, Shofu Inc., Kyoto, Japan) at 0.4 MPa pressure for 5 s. After VBATDT: 6-(4-vinylbenzyl-n-propyl)amino-1,3,5-triazine-2,4-dithiol, MDP: 10-methacryloyloxydecyl dihydrogen phosphate cleaning with filtered air, all bonding surfaces were pretreated with an adhesive primer (Alloy Primer, Kuraray Noritake Dental Inc., Tokyo, Japan; Table 2), which has been shown to be effective for both Alloy 14,15) and ZR [16][17][18] .…”