Shear Bond Strength of Metal Orthodontic Brackets on Prepared Silver-Palladium Alloy Surfaces; An In Vitro Study
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Abstract
Orthodontists are facing the problem of bonding orthodontic brackets to non-enamel surfaces, especially in full metal crown restorations. Limited information is available about the strength of bond of orthodontic attachment to dental based alloy. This in vitro study aimed to evaluate the effects of three metal primers on the shear bond strength of orthodontic brackets bonded to sandblasted silver-palladium alloy with light-activated orthodontic adhesive. Forty silver-palladium specimens were sandblasted and assigned to four groups: (1) No metal primer, (2) Reliance Metal Primer, (3) ML Primer and (4) Alloy Primer. The brackets
were bonded to the conditioned alloy using the light-activated orthodontic resin (TransbondTM XT). After being incubated in deionized water at 37o C for 24 hours, thermocycling (5,000 cycles) was performed. Shear bond strength was measured with
a universal testing machine at 1 mm/min. The data were analyzed with one-way ANOVA and the Adhesive remnant index was assessed. Scanning electron microscopy were assessed on intact, sandblasted and after de-bonding specimens. The results showed that the mean shear bond strength values (MPa) for no metal primer, Reliance metal primer, ML primer and Alloy primer were 9.19 ± 3.39, 15.00 ± 3.10, 11.37 ± 2.84 and 16.30 ± 3.63 respectively, while the trends of Adhesive remnant index (more than 50%) in each group were 1, 0, 2 and 3, respectively. The shear bond strengths in Reliance Metal Primer and Alloy Primer groups were significantly higher than no primer and ML primer groups.(p < 0.05) With this in vitro study, sandblasting with/without metal primer yielded adequate shear bond strength (>5 MPa) of metal brackets on silver-palladium alloy with light-activated adhesive resin. Reliance Metal Primer would be the appropriate metal primer in this study because of the high shear bond strength and the low ARI scores.
Article Details
บทความ ข้อมูล เนื้อหา รูปภาพ ฯลฯ ที่ได้รับการลงตีพิมพ์ในวิทยาสารทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่นถือเป็นลิขสิทธิ์เฉพาะของคณะทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่น หากบุคคลหรือหน่วยงานใดต้องการนำทั้งหมดหรือส่วนหนึ่งส่วนใดไปเผยแพร่ต่อหรือเพื่อกระทำการใด ๆ จะต้องได้รับอนุญาตเป็นลายลักษณ์อักษร จากคณะทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่นก่อนเท่านั้น
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