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Shear Bond Strength of Bracket Bases to Adhesives Based on Bracket Base Design

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Technical Report

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Uniformed Services University Of The Health Sciences Bethesda United States

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Intro There were two specific aims of this study. The first aim was to show that the testing method developed is without investigator bias. The second aim was to test the difference in bond strengths at the bracket base-adhesive interface. It was hypothesized that new retentive design features in bracket bases would provide a higher shear bond value when compared to the traditional mesh based orthodontic bracket. Methods The experimental design included 4 test groups, each consisting of different bracket base designs. Group 1 included 3M Uniteks Victory Series TM with Mesh Pad. Group 2 included ODPs Comfort Zone TM Series with Anchor LockTM Pad consisting of retentive pylons with undercuts Claiming bond strength equal to or greater than conventional mesh pads. Group 3 included ODPs Comfort Zone TM Series with Accu-Lock TM Mesh Pad. Group 4 included Dentaurums M Series TM with Laser Structured Base Claiming bond strength twice that of mesh bases. Each group was mounted on a jig compatible with the Instron Universal Testing Machine 5543 Instron , Norwood, MA. Shear bond strengths were obtained in Megapascals MPa calculated from the peak load of failure in Newtons N divided by the specimen surface area. The Adhesive Remnant Index ARI was used to assess the amount of resin left on the bracket base after debonding. A double blind method was used to prevent operator bias whenassigning ARI scores.

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