Comparative evaluation of the shear bond strength of ceramic brackets of three different base designs bonded to amalgam and composite restorations with different surface treatment.

Maryam Shirazi,Monirsadat Mirzadeh,Sepideh Arab,Malek Modirrousta

doi:10.17219/dmp/131684

Abstract

Nowadays, due to the increasing number of adult orthodontic applicants, who also have multiple dental restorations, it is important to have the ability to bond an orthodontic appliance to restoration surfaces. The aim of this paper was to determine the shear bond strength of ceramic brackets of 3 different base designs bonded to amalgam and composite restorations after using different surface treatment methods in vitro. In an in vitro study, the surfaces of 180 amalgam and composite specimens were prepared by using sandblasting and the erbium, chromium-doped yttrium, scandium, gallium, and garnet (Er,Cr:YSGG) laser irradiation. Ceramic brackets of 3 base designs, including Star, Cross and Slot, for upper central teeth were bonded to amalgam and composite surfaces by using Transbond™ XT Light Cure Adhesive. All specimens were incubated at a temperature of 37°C for 1 week, and then subjected to shear bond strength tests after 1,000 cycles of thermal cycling. The bond strength of the groups was analyzed by means of the one-way and two-way analysis of variance (ANOVA), and the comparison of the 2 groups was made with Tukey's test. Residual adhesives were also determined by a 4-part criterion (0-3) in different groups and the results were analyzed with the χ2 test. There was a significant difference in the shear bond strength of brackets of 3 base designs bonded to amalgam and composite surfaces with different surface treatment. According to the results of this study, all surface treatment methods and different bracket base designs were able to provide sufficient shear bond strength on composite and amalgam surfaces. As far as the bracket base design is concerned, the use of each of the 3 base designs in the amalgam group brought desirable results in terms of the adhesive remnant index (ARI) and shear bond strength values; the use of the Star base design in the composite group proved to be suitable.

Highlights

In contemporary orthodontic treatment, establishing a successful clinical bond between the bracket and the tooth surface is essential
There was a significant difference in the shear bond strength of brackets of 3 base designs bonded to amalgam and composite surfaces with different surface treatment
Et al Shear bond strength of brackets bonded to restorations

Summary

Introduction

In contemporary orthodontic treatment, establishing a successful clinical bond between the bracket and the tooth surface is essential. The number of patients applying for orthodontic treatment is on the rise, and adults’ treatment has grown rapidly Orthodontic treatment for both clinical and cosmetic purposes has long been popular among teenagers, but in recent times, middle-aged patients and seniors have sought orthodontic treatment more frequently than previously. These patients commonly received amalgam or metal restorations in their earlier dental treatment. As adults tend to look esthetic, they use ceramic brackets and have dental restorations, many studies have been conducted on the bond strength of orthodontic brackets on restoration surfaces, such as amalgam or porcelain. Due to an increasing number of adult orthodontic applicants, who have multiple dental restorations, it is important to have the ability to bond an orthodontic appliance to restoration surfaces

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