In vitro corrosion of self-engaging orthodontic brackets -

Toxic elements may be released by corrosion of orthodontic appliances, contribute to adverse patient reactions. Previous studies have shown that the composition of orthodontic attachments is complex in that several different alloys are used in the same attachment. The close contact of alloys with different composition enhances the galvanic corrosion of the attachment in the oral cavity where saliva acts as an electrolyte.

Problems with sealants for bracket bonding -

The polymerization in thin films on smooth tooth surfaces was assessed for four conventional bonding and pit and fissure sealants and one new acetone-containing sealant.