Evaluation of shear bond strength of zirconia to composite resin using different adhesive systems

Abstract

Background To evaluate shear bond strength of zirconia to composite resin using different universal and conventional adhesives and a zirconia primer. Material and Methods Forty zirconia blocks were fabricated of zirconium ingots (10×10×5 mm) and sintered at 1530°C for 2 hours. They were then air-abraded with Al2O3 particles. The specimens were divided into 4 groups and subjected to one of the following bonding agents: Futurabond U (group 1), Clearfil Universal Bond, universal adhesives (group 2), Z-Prime Plus, zirconia primer (group 3) and Adper Single Bond 2, conventional adhesive (group 4). Composite resin was then applied in a diameter of 5 mm and in a thickness of 2 mm. All the specimens were stored in distilled water at 37°C for 24 hours and then thermocycled between 5°C and 55°C for 5000 cycles with a 30-second dwell time. The shear bond strength was then evaluated with a universal testing machine at a crosshead speed of 1 mm/min. Data (MPa) were analyzed using ANOVA and LSD test ( P ≤0.05). The specimens were evaluated under a stereomicroscope to determine the mode of failure. Results The mean shear bond strength was 16,874 MPa in group I, 13.4434 MPa in group II, 11.6500 MPa in group III and 6.8700 MPa in group IV. ANOVA revealed that the shear bond strength in group IV was significantly lower than that in other groups ( P ≤0.05). Conclusions The shear bond strength in group I was significantly higher than that in groups III and IV. So Universal adhesives could provide higher shear bond strength of zirconia to composite resin after thermocycling compared to zirconia primers. Key words: 10-MDP, shear bond strength, universal adhesive systems, zirconia primer.

Effects of 10-MDP Based Primer on Shear Bond Strength between Zirconia and New Experimental Resin Cement

“…Therefore, differing from glass ceramics, acid-etching is not effective in preparing the surface for the adhesive cementation. At the same time, the absence of silica in its structure does not allow suitable direct bonding of composite resin [9,10]. With this intent, several surface conditioning methods are used such as selective etching, laser beam surface etching, grinding, air abrasion with alumina (aluminum oxide, Al 2 O 3 ) particles, tribochemical silica (SiO 2 ) coating, and application of adhesive/primer, or a combination of them [11].…”

Comparison of the bond strength of composite resin to zirconia and composite resin to polyether ether ketone: An in vitro study

“…[ 8 ] Also the zirconia–feldspathic veneer interface is one of the major weak points of these restorations, and in some cases, it results in fractures, exposing the underlying zirconia. [ 9 10 ]…”

“…Initially, air abrasion without a primer can result in high strength, but the strength of the bond decreases sharply even to zero over time. [ 9 ] In a study of different zirconia surface preparation methods, although the surface roughness was higher with the use of Neodymium-doped Yttrium Aluminium Garnet (Nd: YAG) laser compared with other classes, air abrasion surface preparation yielded higher shear bond strength. [ 5 ] Before thermocycling, the pressure time and size of the air abrading particles had no significant effect on the bond strength; however, after thermocycling, they clearly resulted in the long-term bond strength.…”

Abrasive blasting in clinical dentistry – literature review

“…Tradycyjne postępowanie naprawcze często okazuje się niewystarczające i konieczne jest użycie abrazji powietrznej celem lepszego rozwinięcia powierzchni i uzyskania trwalszego połączenia pomiędzy dwoma rodzajami materiałów składowych naprawianego uzupełnienia. 48,[51][52][53][54] Mikropiaskarki abrazyjne z uwagi na swoją uniwersalność zastosowań mogą stanowić alternatywę dla klasycznych piaskarek abrazyjnych przy wykonywaniu niektórych procedur. Największym mankamentem tego rodzaju urządzeń jest stosunkowo duże zapylenie pola zabiegowego w trakcie ich pracy, wynikające z braku płaszcza wodnego.…”