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Orthodontics
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Orthodontics 8 (2007), No. 1     15. Jan. 2007
Orthodontics 8 (2007), No. 1  (15.01.2007)

Page 8-12


Evaluation of a New Nano-Filled Restorative Material for Bonding Orthodontic Brackets
Bishara, Samir E. / Ajlouni, Raed / Soliman, Manal M. / Oonsombat, Charuphan / Laffoon, John F. / Warren, John
Aim: To compare the shear bond strength of a nano-hybrid restorative material, Grandio (Voco, Cuxhaven, Germany), to that of a traditional adhesive material (Transbond XT; 3M Unitek, Monrovia, CA, USA) when bonding orthodontic brackets.
Material and methods: Forty teeth were randomly divided into 2 groups: 20 teeth were bonded with the Transbond adhesive system and the other 20 teeth with the Grandio restorative system, following manufacturer's instructions. Student t test was used to compare the shear bond strength of the 2 systems. Significance was predetermined at P ¡Ü .05.
Results: The t test comparisons (t = 0.55) of the shear bond strength between the 2 adhesives indicated the absence of a significant (P = .585) difference. The mean shear bond strength for Grandio was 4.1 ¡À 2.6 MPa and that for Transbond XT was 4.6 ¡À 3.2 MPa. During debonding, 3 of 20 brackets (15%) bonded with Grandio failed without registering any force on the Zwick recording. None of the brackets bonded with Transbond XT had a similar failure mode.
Conclusions: The newly introduced nano-filled composite materials can potentially be used to bond orthodontic brackets to teeth if its consistency can be more flowable to readily adhere to the bracket base.