Evaluation of microleakage for three types of light cure orthodontic band cement

The aim of this study was to compare the microleakage of three types of light cure orthodontic band cement (Resilience, Band-it and Transbond Plus) and to compare low and high curing light intensities at the enamel-cement and band-cement interfaces in the gingival and occlusal margins.

Sixty extracted human premolars were divided into six groups (n = 10 specimens) according to the type of cement used and intensity of light cure. Microetched bands of upper premolars cemented to the teeth by Transbond Plus (3 M Unitek), Resilience (Orthotechnology) and Band-it (db Orthodontics). Three groups were cured by a standard mode light cure (over 900 mw/cm²) for 20 s, and the other three groups were cured with an extra mode light cure (over 2700 mw/cm²) for 6 s. The teeth were sealed by nail varnish and immersed for 24 h in 0.5% basic fuchsin solution. After that, the teeth were sectioned in the buccoligual direction, observed under a stereomicroscope, and then recorded for microleakage at the enamel-cement and band-cement interfaces in the gingival and occlusal margins. The statistical analysis was performed using Kruskal-Wallis and Mann-Whitney U tests, and the level of significance was set at P < 0.05.

The microleakage scores showed no significant differences at the enamel-cement and band-cement interfaces among the three types of orthodontic band cement subjected to low- and high-intensity curing light.

The type of cement and intensity of light cure did not affect the amount of microleakage at either interface.