In vitro bond strength of the three different types of brackets (ceramic, stainless steel, and titanium) was tested both in shear and in tensile modes.
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Methods: Three types of brackets were selected: Orthos2 (Ormco, Glendora, Calif), Damon2 (Ormco), and In Ovation-R (GAC, Bohemia, NY).
Moreover, regarding the type of bracket material, ceramic brackets revealed the highest bond strength values in all testing modes compared with the other types of brackets, and the FE analysis also supported this finding to a great extent.
The linear mixed model revealed that the different types of brackets had different effects on friction (Figure 7).
They found no significant difference in release of these ions among the three types of brackets [20].
Ceramic brackets generated the lowest maximum principal stress on enamel compared with the other types of brackets in each loading mode (Figures 3,4,5).
This study looked at various factors that contribute to frictional force in different types of brackets, and it was not possible to establish the most influential factor.
In the Lower lingual group, keeping the other variables constant (wire and ligature), the In-Ovation L bracket produced higher values of frictional forces as compared to New STb. Figure 7 Caterpillar plot: effect on friction for different types of brackets.
Matos de Souza et al. in 2008 assessed the release of nickel, chromium, and iron ions from three types of brackets in the saliva in vivo and showed an abrupt increase in concentration of nickel and chromium after immersion of orthodontic components in all three groups.
