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Comparison of Shear Bond Strength of Three Different Brackets Bonded on Zirconium Surfaces (In Vitro Study)

Authors: Saif Mauwafak سيف موفق --- Dhiaa Jaafar Al-Dabagh ضياء جعفر الدباغ
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2016 Volume: 28 Issue: 3 Pages: 142-148
Publisher: Baghdad University جامعة بغداد


Background: With the increased in the demands of adult orthodontics, the challenge of direct bonding to nonenamelsurface (zirconium) had been increased. The present study was carried out to compare the shear bondstrength of three different brackets (stainless steel, sapphire and composite) bonded to zirconium surface and studythe mode of bond failure.Materials and methods: The sample was comprised of 30 models (8mm *6mm*1.5mm) of full contour zirconiumveneers. They were divided into three groups according to the brackets type; all samples were treated first bysandblast with aluminum oxide particle 50 μm then coated by z-prime plus primer. A central incisor bracket of eachgroup was bonded to the prepared zirconium surface with light cure adhesive resin (Transbond TM XT, 3M Unitek,USA). Shear bond strength was measured by using Tinius Olsen universal testing machine at crosshead speed of0.5min. After debonding, each bracket and zirconium surface were examined using magnifying lens and adhesiveremnant index was recorded. The difference in shear bond strength between main groups was analyzed by usingANOVA at p≤0.05.Results: The results revealed high significant difference among all tested groups and the highest value was forsapphire brackets (7.49±1.45 Mpa) of all groups followed by stainless steel brackets (6.46±1.43Mpa) and compositebrackets had the least value (4.35±0.72). Non-significant difference in the site of bond failure among all groups ofbrackets and zirconium-adhesive interface failure (score III) was the predominant.Conclusion: the new zirconium prime plus primer can be successfully used in bonding stainless steel and sapphirebrackets to zirconium surface.

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