Influence of sandblasting parameters and luting materials on microshear bond strength to a CAD/CAM hybrid ceramic material | ||||
| Egyptian Dental Journal | ||||
| Article 2, Volume 66, Issue 3 - July (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials), July 2020, Page 1637-1648 PDF (1.06 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/edj.2020.24097.1123 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Sayed Ghorab; Dina Farahat 
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| Department of Dental Biomaterials, Faculty of Dentistry, Mansoura University | ||||
| Abstract | ||||
| Objective: To assess the influence of sandblasting parameters (applied pressure and grain particle size) on the microshear bond strength (μSBS) of Vita Enamic (VE) CAD/CAM hybrid ceramic to two different resin cements. Materials and Methods: One-hundred VE specimens were fabricated and allocated to 5 pretreatment groups (n=20/group): no treatment, 50 μm Al2O3 (2 bar), 50 μm Al2O3 (3.5 bar), 110 μm Al2O3 (2 bar) and 110 μm Al2O3 (3.5 bar). After pretreatment, surface roughness (Ra) was determined using a profilometer. The topography of pretreated surfaces was examined with Scanning Electron Microscopy (SEM). Each group was further divided into two subgroups according to type of luting material; subgroup (a): G-CEM LinkAce and subgroup (b): Single bond universal and RelyX Ultimate. After bonding, μSBS was measured with a Universal Testing Machine. Data were statistically analyzed using ANOVA and Tukey HSD tests (α=.05). Results: Specimens air-abraded with 110 μm Al2O3 and pressure 2 bar showed the highest but insignificant μSBS compared to other sandblasted groups (P < 0.05). μSBS values (MPa) improved in the following order: 110 μm (2 bar) > 50 μm (2 bar) > 110 μm (3.5 bar) > 50 μm (3.5 bar) > control. Regardless the Al2O3 size, μSBS improved when sandblasting pressure was 2 bar while decreased with 3.5 bar groups. RelyX Ultimate showed higher μSBS than G-CEM LinkAce. Conclusions: Sandblasting of VE surface by (2 bar) pressure and the use of conventional resin cement in association with universal adhesive system were required to achieve satisfactory bond strength values. | ||||
| Keywords | ||||
| CAD/CAM hybrid ceramic; Luting cements; Microshear bond strength | ||||
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