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. 2017 Jun;51(2):99-105.
doi: 10.15644/asc51/2/2.

Shear Bond Strength of Orthodontic Brackets Bonded to Zirconium Crowns

Blerim Mehmeti  1   2 , Bleron Azizi  2 , Jeta Kelmendi  2 , Donika Iljazi-Shahiqi  2 , Željko Alar  3 , Sandra Anić-Milošević  4
Affiliations

Shear Bond Strength of Orthodontic Brackets Bonded to Zirconium Crowns

Blerim Mehmeti et al. Acta Stomatol Croat. 2017 Jun.

Abstract

Background: An increasing demand for esthetic restorations has resulted in an increased use of all-ceramic restorations, such as zirconium. However, one of the challenges the orthodontist must be willing to face is how to increase bond strength between the brackets and various ceramic restorations.Bond strength can beaffected bybracket type, by the material that bracketsaremade of, and their base surface design or retention mode. ​: Aim: of this study was to perform a comparative analysis of the shear bond strength (SBS) of metallic and ceramic orthodontic brackets bonded to all-zirconium ceramic surfaces used for prosthetic restorations, and also to evaluate the fracture mode of these two types of orthodontic brackets.

Material and methods: Twenty samples/semi-crowns of all-zirconium ceramic, on which orthodontic brackets were bonded, 10 metallic and 10 ceramic polycrystalline brackets, were prepared for this research. SBS has been testedby Universal Testing Machine, with a load applied using a knife edged rod moving at a fixed rate of 1 mm/min, until failure occurred. The force required to debond the brackets was recorded in Newton, then SBS was calculated to MPa. In addition, the samples were analyzed using a digital camera magnifier to determine Adhesive Remnant Index (ARI). Statistical data were processed using t-test, and the level of significance was set at α = 0.05.

Results: Higher shear bond strength values were observed in metallic brackets bonded to zirconium crowns compared tothoseof ceramic brackets, with a significant difference. During the test, two of the ceramic brackets were partially or totally damaged.

Conclusion: Metallic brackets, compared to ceramic polycrystalline brackets, seemed tocreate stronger adhesion with all-zirconium surfaces due to their better retention mode. Also, ceramic brackets showed higher fragility during debonding.

Keywords: Dental Debonding; Ortodontic Brackets; Shear Bond Strenght.

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Conflict of interest statement

Conflict of Interest: There are no conflicts of interest to declare.

Figures

Figure 1
Figure 1
Base surface design or retention mode of orthodontic brackets: a) metallic and b) ceramic
Figure 2
Figure 2
SBS testing of orthodontic brackets bonded to zirconium
Figure 3
Figure 3
Means, standard errors (SE) and 95% confidence interval SBS-a bythe type of bracket
Figure 4
Figure 4
Median, interquartile range and range of SBS-a by the type of bracket
Figure 5
Figure 5
ARI distributions by type of brackets
See this image and copyright information in PMC

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