Abstract
Introduction: The aim of this study was to determine whether there was a significant difference in shear bond strength between metal and ceramic brackets when exposed to acidic dietary components (beverages) and to observe the chromogenic potential of each in vitro. Methods: Metal and clear orthodontic brackets were placed on extracted maxillary second premolars and exposed to select beverages three times daily for four weeks. Shade was taken using a colorimeter device at seven intervals and the shear bond strength of each bracket was recorded. Results: There was a variable change in tooth shade with respect to the various beverages in which they were submerged. Coffee and Dr. Pepper had the most pronounced change, whereas Red Bull and water produced little to none, respectively. Compared to controls, brackets submerged in coffee had the greatest reduction in shear bond strength, followed by Dr. Pepper, then Red Bull. Overall, clear brackets showed higher shear bond strength than metal brackets. Conclusion: Acidic dietary components have a negative effect on the shear bond strength of orthodontic brackets, and more pigmented beverages have a higher chromogenic staining potential.
Highlights
The aim of this study was to determine whether there was a significant difference in shear bond strength between metal and ceramic brackets when exposed to acidic dietary components and to observe the chromogenic potential of each in vitro
Results showed that metal brackets had a lower shear bond strength compared to clear brackets, where the difference was statistically significant according to both two-way Analysis of variance (ANOVA) (p = 0.036) and Tukey (p = 0.015) analyses
For each set, the dietary solutions appeared to follow a trend empirically, with coffee-soaked teeth exhibiting the lowest shear bond strength, followed by Dr Pepper, Red Bull; ANOVA analysis showed the differences between intra-bracket type samples and between beverages as a whole were insignificant (p > 0.05)
Summary
The aim of this study was to determine whether there was a significant difference in shear bond strength between metal and ceramic brackets when exposed to acidic dietary components (beverages) and to observe the chromogenic potential of each in vitro. Conclusion: Acidic dietary components have a negative effect on the shear bond strength of orthodontic brackets, and more pigmented beverages have a higher chromogenic staining potential. Frequent consumption of carbonated acidic drinks provides a regular supply of corrosive agents in addition to other contributors of acid to the oral cavity, such as fluoride-containing products like toothpaste and mouthwash This is problematic as an acidic environment increases the corrosion susceptibility of certain metals, especially titanium [5]. It has been shown that acidic soft drinks have a negative effect on bracket retention against shearing forces [11]
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