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The Effect of Bracket Base Pylon Orientation on the Shear Bond Strength of the ODP ANCHOR-LOCK Bracket Pad

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Technical Report

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Uniformed Services University Of The Health Sciences Bethesda United States

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Introduction The purpose of this study was to compare the shear bond strength of three different pylon orientations on the ODP ANCHOR-LOCK bracket pad. Null hypothesis Pylon orientation does not significantly affect shear bond strength. Methods Three groups, consisting of 25 brackets each, were bonded to secured surfaces of Transbond XT. Each group of brackets had a distinct pylon orientation. The three different pylon orientations included Group 1 0 degree brackets with 90 degree pylons, Group 2 -7 degree brackets, with acute pylon orientation to shear force, and Group 3 -7 degree bracket flipped to achieve 7 degree bracket with obtuse pylon orientation to shear force. Shear bond strength was determined using a universal testing machine. An analysis of variance, one-way ANOVA test was performed to determine if there was a significant difference between the three different pylon orientations. A Tukey HSD test was used to help determine which orientations were significantly different from one another. The Kruskal Wallis test was used to assess the Adhesive Remnant Index ARI scores for any significant differences. After a difference was determined, the Mann-Whitney test was used to determine which groups were significantly different P 0.05.Results No significant differences existed between Groups 1 and 2. Group 3 was found to have significantly lower shear bond strength than groups 1 and 2 P 0.001. Group 3 was also found to have a significantly lower adhesive remnant score less adhesive remaining on the bracket than groups 1 and 2 P 0.001. Conclusions This study concluded that pylon orientation affects shear bond strength. Perpendicular and acute of pylon angles relative to the direction of forceapplied had significantly higher shear bonds strengths and more adhesive remnants within the bracket base than obtuse pylon angles.

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