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Evaluation of shear bond strength of zirconia to tooth structure after different zirconia surface treatment techniques

Authors: Reem Mounes Dawood ريم مؤنس داود --- Adel F. Ibraheem عادل فرحان ابراهيم
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2015 Volume: 27 Issue: 1 Pages: 77-85
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: This study aimed to evaluate the effect of zirconia different surface treatments (primer, sandblast with50μmAl2O3, Er,Cr:YSGG laser) on shear bond strength between zirconia surface and resin cement.Material and methods: Sixty presintered Y-TZP zirconia cylinder specimens (IPS e.max ZirCAD, Ivoclar vivadent) will befabricated and sintered in high temperature furnace of (1500 C for 8 hours) according to manufacturer’s instructionsto the selected size and shape of (5mm. in diameter and 6mm in height). All specimens were ground flat using600.800.1000.1200, aluminum oxide abrasive paper to obtain a standardized surface roughness. Surface roughnessvalues were then recorded in μm using surface roughness tester (profilometer) to obtain a standardized data baseline for all samples. The specimens were then randomly divided into three main groups (n=20); group A: no surfacetreatment (control group), group B: specimens in this group treated with 50μm Al2O3 and group C: specimens in thisgroup treated with Er,Cr:YSGG laser.Sixty sound human premolars were used in this study, after construction of acrylic blocks, the occlusal surface of theteeth were ground flat, with diamond cutting disk to obtain a flat dentine surface .Prior to cementation of zirconia cylinders to tooth specimens subgroups (A1,B1,C1) will receive a coat ofmetal/zirconia primer and left to react for three minutes, while the subgroups (A2,B2,C2) were left undisturbed.Bonding surface of zirconia cylinder was then luted with SpeedCEM self adhesive resin cement under a static load of2Kg. placed on the vertical arm of the surveyor and allowed to auto cure for 4minutes.The final cementedspecimens were then stored in distilled water at room temperature for 24hours.All specimens were subjected to shear loading force in a universal testing machine at crosshead speed of 1mm/min.The shear bond strength values were analyzed statistically with one-way ANOVA; the fractured surfaces of zirconiacylinders were examined with a stereo-microscope to observe the failure mode.Results: The air borne-particle of 50μm followed by primer application showed significantly the higher bond strengththan other groups.Conclusion: Within the limitation of this study, the results showed that sandblasting the bonding surface of zirconiumcylinders with 50μmAl2O3 produced the highest values of shear bond strength , also the use of primer enhancedshear bond strength as well

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