@Article{, title={Measuring and comparing the shear bond strength of acrylic resin veneer to nickel –chromium alloy after different metal surface treatments}, author={Dr. Nidhal Sahib Mansoor/ lecturer د. نضال صاحب and Dr. Lateef Essa Al-Jorani / Assistant Professor د. لطيف عيسى and Dr. Farhan Dakhil Salman / Assistant Professor د. فرحان داخل}, journal={MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان}, volume={11}, number={1}, pages={67-87}, year={2014}, abstract={The bond strength of metal-resin interface of prosthesis is a key factor indetermining the serviceability of that prosthesis. The main objective of this study wasto 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.).Onehundred twenty eight disc shaped samples from base plate wax were prepared, thediameter of disc was (8mm×4.5mm).After casting the metal, the samples werecleaned, finished, and polished by silicon carbide abrasive paper with a grit size(600μm), and then the profilometer was used to determine the surface roughness ofthe samples (Ra) which ranged between (0.09-0.13μm). Then the samples weredivided into 2 categories ,each category contain (64)samples which also weresubdivided into 8 group ,the first category include (A, B, C, D, E, F, G, H) and thesecond category include (At, Bt, Ct, Dt, Et, Ft, Gt, Ht), according to the metal surfacetreatment which include :Group A, At: Received no treatment and serve as control.Group B, Bt: Received chemical treatment using chemical bonding agent (Metalprimer II).Group C, Ct: Received micromechanical treatment using air abrasion with 50μmAl2O3.Group D, Dt: Received micromechanical treatment using air abrasion with 50μmAl2O3 +metal primer IIGroup E, Et : Received micromechanical treatment using air abrasion with110μmAl2O3.Group F, Ft: Received micromechanical / chemical treatment using (airAbrasion110μm 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 abrasion250μm Al2O3 +metal primer II).The acrylic was then prepared as round shape (8mm in diameter and 2mm inthickness) that was placed on the metal surface treatment; the acrylic was fabricated inthe same conventional way for construction veneer resin.For the specimens in the first category, the specimens were tested under drycondition, while in the second category; the specimens were tested after (24) hoursstorage in water room temperature (37˚C) and (1000 time) thermocycling. The shearbond strength was tested in instron universal testing machine.The results before and after thermocycling showed that the air abrasion with50μm Al2O3 plus metal primer II group gave the highest shear bond values, followedby air abrasion with 110μm Al2O3 plus metal primer II, followed by air abrasion with50μm 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 shearbond strength values than other groups.

} }