The use of single step adhesives in bonding orthodontic brackets.

L. Von Wald, S.E. Bishara, J.R. Jacobsen
Hellenic Orthodontic Review 1999;2:71-77.

Previous studies have suggested that the new single-step adhesive systems used in operative dentistry and can bond to both enamel and dentin, require a shorter application time while maintaining adequate bond strength. In orthodontics, several repetitions of the bonding procedure are necessary, therefore, adhesive systems requiring less time for application are of particular interest. The purpose of this study was to determine the effect of incorporating single step adhesives to a traditional bonding system, on the shear bond strength of orthodontic brackets. Sixty recently extracted human teeth were divided into three equal groups. Group I (control): brackets were bonded with the Transbond XT adhesive system (3M/Unitek) following the manufacturer’s instructions; Group II: Single Bond (3M) adhesive was applied to the tooth surface and Transbond XT adhesive paste was used to bond the brackets; Group III: Optibond Solo (Kerr Co.) adhesive was applied to the enamel surface and Transbond XT adhesive was used to bond the brackets. Teeth were stored in deionized water at 37oC for 24 hours. A Zwick Universal Testing Machine was used to measure shear bond strength. The shear bond strengths for the three groups tested were; Group É: 11.8+4.6 Mpa; Group ÉÉ: 12.5+3.9 Mpa; and Group ÉÉÉ: 9.7+4.3 Mpa. Analysis of Variance (F=2.37) indicated that there were no significant differences (p>0.05) in the bond strengths among the three groups. In conclusion, the use of single step adhesives to replace the sealant did not significantly affect the shear bond strength of the adhesive system.

Request for reprints:Dr. Samir E. Bishara, Professor, Department of Orthodontics, College of Dentistry, University of Iowa, Iowa City, Iowa 52242, U.S.A.