Measuring and comparing the shear bond strength of acrylic resin veneer to nickel –chromium alloy after different metal surface treatments | ||
| MUSTANSIRIA DENTAL JOURNAL | ||
| Article 1, Volume 11, Issue 1, December 2014, Pages 67-87 | ||
| Authors | ||
| Dr. Nidhal Sahib Mansoor; ; Assistant Professor; Dr. Lateef Essa Al-Jorani; Dr. Farhan Dakhil Salman; Assistant Professor | ||
| Abstract | ||
| The bond strength of metal-resin interface of prosthesis is a key factor in determining the serviceability of that prosthesis. The main objective of this study was to determine the effect of different surface treatment on the shear bond strength of Ni- Cr alloy (CB-Blando 72 alloy) and heat cured acrylic veneer resin (Ivoclar Co.).One hundred twenty eight disc shaped samples from base plate wax were prepared, the diameter of disc was (8mm×4.5mm).After casting the metal, the samples were cleaned, finished, and polished by silicon carbide abrasive paper with a grit size (600μm), and then the profilometer was used to determine the surface roughness of the samples (Ra) which ranged between (0.09-0.13μm). Then the samples were divided into 2 categories ,each category contain (64)samples which also were subdivided into 8 group ,the first category include (A, B, C, D, E, F, G, H) and the second category include (At, Bt, Ct, Dt, Et, Ft, Gt, Ht), according to the metal surface treatment which include : Group A, At: Received no treatment and serve as control. Group B, Bt: Received chemical treatment using chemical bonding agent (Metal primer II). Group C, Ct: Received micromechanical treatment using air abrasion with 50μm Al2O3. Group D, Dt: Received micromechanical treatment using air abrasion with 50μm Al2O3 +metal primer II Group E, Et : Received micromechanical treatment using air abrasion with 110μmAl2O3. Group F, Ft: Received micromechanical / chemical treatment using (air Abrasion110μm Al2O3 + metal primer II application). Group G ,Gt: Received micromechanical treatment using air abrasion 250μm Al2O3. Group H, Ht: Received micromechanical /chemical treatment using (air abrasion 250μm Al2O3 +metal primer II). The acrylic was then prepared as round shape (8mm in diameter and 2mm in thickness) that was placed on the metal surface treatment; the acrylic was fabricated in the same conventional way for construction veneer resin. For the specimens in the first category, the specimens were tested under dry condition, while in the second category; the specimens were tested after (24) hoursstorage in water room temperature (37˚C) and (1000 time) thermocycling. The shear bond strength was tested in instron universal testing machine. The results before and after thermocycling showed that the air abrasion with 50μm Al2O3 plus metal primer II group gave the highest shear bond values, followed by air abrasion with 110μm Al2O3 plus metal primer II, followed by air abrasion with 50μm Al2O3, followed by air abrasion with 250μm Al2O3 plus metal primer II, followed by air abrasion with 110μm Al2O3, followed by air abrasion with 250μm, followed by metal primer II group, and followed by untreated group. Also after thermocycling showead that the micromechanical/chemical treatment (air abrasion with Al2O3+metal primer II) gave the highest and more durable shear bond strength values than other groups. | ||
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