Abstract
To study the bonding mechanism and tooth damage in direct bonding of brackets to the tooth surface (Direct Bonding System), a scanning electron microscope was used to observe teeth in vivo. It was found that polishing removed the cuticle, the presence of which affected bonding strength. The creation of many microscopic crevices through acid etching, combined with the application of silane and adhesive, aided in the penetration and firm contact necessary for a strong bond. From the observations, it was concluded that tooth surface damage in the bonding mechanism of DBS was negligible.
