Characteristics of ceramic bracket orthodontics

There are currently two types of bottom surfaces for ceramic brackets. One kind has a groove-shaped bottom surface, which provides a mechanical lock for the adhesive. The bottom surface of this kind of bracket is flat, the surface is coated with silane, and there are small undercuts to increase mechanical support. Compared with other structures, the bottom surface of the bracket, which has both micro-mechanical bonding and chemical bonding, reduces its mechanical retention force. The other has a smooth bottom surface, and the chemical coating on its surface increases the bonding strength. Due to the presence of inert substances in the alumina ceramic bracket, the silane coupling group acts as an intermediate medium to connect the resin adhesive and the surface of the bracket. According to reports, the design of the bottom surface of this bracket can achieve a greater chemical bonding force than the mechanical retention force. In order to avoid potential damage to tooth enamel when removing the brackets, a polycarbonate film can be coated on the bottom surface of the brackets. In this way, the enamel surface is not directly combined with the adhesive, but in contact with the film, which makes it easier to remove the brackets, which reduces the damage to the enamel.