Chulalongkorn University Dental Journal

Publication Date



Objective The purpose of this study was to compare the shear-peel bond strength of metal bracket to the prepared porcelain surface with two different surface preparations; silane and 1.23% acidulated phosphate fluoride (APF) gel. Materials and methods The samples were comprised of 60 porcelain disks (diameter 10 mm, thickness 4 mm). All were unglazed with green stones and then were randomly assigned into 2 groups (30 specimens each). Group 1 (control), the porcelain surface was prepared with silane. Group 2, the porcelain surface was etched with 1.23% APF gel for 10 minutes. A central incisor metal bracket was bonded to the prepared porcelain surface with light-cured adhesive resin and stored in distilled water at 37 ÌC for 24 hours. The shear-peel bond strength was measured by the Instron Universal Testing Machine with 250 Newton (N) load cell at 0.5 mm/min crosshead speed. Difference between the shear-peel bond strength of the two surface preparation procedures was analyzed with independent sample T-test at p = 0.05. Survival probability of bracket was also analyzed by Weibull analysis. Results No significant difference was found between the shear-peel bond strength of the APF gel group (9.42 ± 1.93 megapascals, MPa) and that of the silane group (9.68 ± 1.91 MPa) (p = 0.604). Conclusion The 1.23% APF gel can probably be an alternative of surface preparation when bonding metal bracket to porcelain surface after unglazing with a green stone bur.



First Page


Last Page


Included in

Dentistry Commons



To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.