Rebonding of orthodontic brackets. Part I, a laboratory and clinical study

The Angle Orthodontist
Mona A MontasserCarla A Evans

Abstract

To compare rebonding of orthodontic brackets based on the hypothesis that no difference would be found between the adhesive systems with respect to shear bond strength, mode of failure, and clinical failure rates. The three adhesive systems included two self-etch primers (Transbond and M-Bond) and a conventional phosphoric acid etch (Rely-a-Bond). The sample size was 20 premolars for each adhesive system. The shear bond strength was tested 24 hours after bracket bonding with the bonding/debonding procedures repeated two times after the first debonding. Bond strength, adhesive remnant index (ARI), and failure sites were evaluated for each debonding. Statistical analysis consisted of a two-way analysis of variance (ANOVA) followed by Scheffè analysis. The clinical portion evaluated 15 patients over a 12-month period. The mean shear bond strengths after the first, second, and third debondings for Rely-a-Bond were 8.4 +/- 1.8, 10.3 +/- 2.4, and 14.1 +/- 3.3 MPa, respectively; for Transbond 11.1 +/- 4.6, 13.6 +/- 4.5, and 12.9 +/- 4.4 MPa, respectively; and for M-Bond 8.7 +/- 2.7, 10.4 +/- 2.4, and 12.4 +/- 3.4 MPa, respectively. After the three debondings the mean shear bond strength increased significantly from the first to the th...Continue Reading

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Feb 19, 2010·European Journal of Orthodontics·Rogelio J Scougall-VilchisKohji Yamamoto
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