Comparison between the adhesion forces of two orthodontic systems with moisture affi nity in two enamel surface conditions

Resumen

The purpose of this study was to compare the shear bond strength of orthodontic brackets with two systems of hydrophilic adhesives: (I) a cyanoacrylate adhesive (Smartbond, International Gestenco) and (II) a composite system (Transbond XT and Transbond™ IPM) in two enamel conditions: dry and artifi cial saliva contaminated. Materials and methods: 100 extracted premolars were stored in distilled water at 4 degrees Celsius. The teeth were cleaned, polished, and convenience distributed into 5 groups: (1) composite resin in enamel under dry conditions, (2) cyanoacrylate adhesive in dry enamel condition, (3) composite resin in enamel condition contaminated with artifi cial saliva before the primer, (4) composite resin enamel condition contaminated with artifi cial saliva after the primer, and (5) cyanoacrylate adhesive in artifi cial saliva contaminated enamel condition. The results showed that the adhesive system Transbond XT™ and Transbond MIP obtained the highest values of resistance to debonding in the dry enamel surface. Conclusions: The adhesive system Transbond XT™ and Transbond MIP I provide an adequate in vitro resistance to debonding in every enamel condition. The system based on cyanoacrylate adhesive Smartbond obtained proper values of resistance to debonding in dry enamel, however it obtained the lowest values in contaminated with enamel artificial saliva conditions, unsuitable for orthodontics, and even some samples were not cemented successfully in vitro under these conditions.

Key words: Hydrophilic adhesive, orthodontic bracket, shear bond strength, cyanoacrylate adhesive, Smartbond