Journal Article

A novel bracket base design: biomechanical stability

G. Merone, R. Valletta, R. De Santis, L. Ambrosio and R. Martina

in The European Journal of Orthodontics

Published on behalf of European Orthodontics Society

Volume 32, issue 2, pages 219-223
Published in print April 2010 | ISSN: 0141-5387
Published online November 2009 | e-ISSN: 1460-2210 | DOI:
A novel bracket base design: biomechanical stability

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  • Restorative Dentistry and Orthodontics


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The aim of this research was to investigate the retention of a bracket equipped with a novel base, the R-system®. The design of the bracket base is characterized by concentric grooves. The behaviour of this bracket was compared with a bracket with a conventional mesh base from the same manufacturer.

Thirty lower adult bovine incisors were selected and metallic brackets were bonded using the Concise adhesive system. Each bracket–adhesive–enamel interface was investigated according to torsion debonding. One-way analysis of variance was used for statistical evaluation. Finite element analysis was also undertaken. In order to assess if the technique was detrimental to the enamel, the mode of failure was determined using the Adhesive Remnant Index (ARI). The debonded surfaces were analysed using scanning electron microscopy (SEM) and electron dispersion spectrometry (EDS).

The R-system® provided a bond strength greater than that of the mesh-base bracket. EDS showed that the amount of calcium on the novel base was higher than that on the conventional base, which allowed transfer of torsional stress more uniformly to the substrate, resulting in higher bond values for the R-system®. On the other hand, as debonding of the R-system® occurred at the enamel–composite interface, lesions to the enamel substrate are possible.

Journal Article.  2271 words.  Illustrated.

Subjects: Restorative Dentistry and Orthodontics

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