Shear bond strength of two types of metalic brackets

Esthetics in Dentistry is each day more required, including Orthodontics. As ceramic brackets have high costs for the majority of population in Brazil, metal brackets are still used in small sizes. To use smaller brackets, an excellent base retention mechanism is necessary, beyond an effective adhesive system. Objectives: The objective of this study was to compare two types of metal brackets with different bases sizes: first group Monobloc with retention pins on its base, and second group Roth Light, with single mesh, that uses a shear bond strength machine. Methods: The samples (n=30), made by bovine incisors were divided, 15 for each group, using the buccal surface to bond the brackets with Transbond XT™ resin. Results: After statistical analyses (studentxs T test) it was found significant differences between the two groups (p = 0,426). The group Monobloc showed higher shear bond strength when compared with the other group, Roth Light. Conclusions:

The results showed that when a complex and long time orthodontic treatment is needed, Monobloc bracket is recomended to obtain higher stability and to avoid the need of rebonding during the treatment, obtaining this way, success to end the treatment.