Published Online: Dec 14, 2023
Page range: 184 - 188
Received: Mar 01, 2009
Accepted: Sep 01, 2010
DOI: https://doi.org/10.2478/aoj-2010-0030
© 2010 Kathiravan Purmal et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.
Aims
To investigate the shear bond strengths of buccal tubes and to determine the sites of failure.
Method
Four orthodontic buccal tubes were selected: A, American Orthodontics; B, 3M Unitek - small base; C, 3M Unitek - large base; D, Hangzhou Dentop. Twenty buccal tubes from each group were bonded to the buccal surfaces of lower right first molars with the same light-cured composite resin. The buccal tubes were debonded with a universal testing machine and the data analysed. The amount of adhesive remaining on the teeth after debonding was classified with the modified adhesive remnant index (ARI).
Results
The groups ranked from the highest to lowest bond strength (MPa) were: B, A, D and C. The bond strengths of the buccal tubes, except Groups A and B, were significantly different (
Conclusions
The shear bond strengths of the buccal tubes fell below the value considered to be clinically acceptable. There were no differences between the shear bond strengths of the buccal tubes with photoetched and microetched bases. The buccal tubes with the largest base failed prematurely, possibly because the unsupported bonding pad flexed during debonding.